IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: amachq on June 05, 2009, 11:05:50 pm
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can anyone tell wht was the answer of question no.40
that sewage thing...........
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i put C but im not sure loads of my friends put D
im convinced its C! you?
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I put D. I think it was the correct one...
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About that question of the phloem tubes... what was the answer? i put fats... is it correct?
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is D farm A?......i don't get the question..if the nitrate levels were the highest after that farm then doesnt it have the most fertiliser?
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for the sewage one, the last question, im quite sure it was D...the phloem was obviously fat..cuz phloem transport amino acids and sucrose in solution (water)
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yup that was D and the aphids lack fats
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for the sewage one, the last question, im quite sure it was D...the phloem was obviously fat..cuz phloem transport amino acids and sucrose in solution (water)
then how come nuts which are made from plants have fat in them where did it come from? plus fats are not dissolved in water just like sucrose
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Green plants can make all the materials(including fats and sucrose)using water,carbon dioxide and salts. They r synthesized from sugar molecules and other molecules produced in photosynthesis.
Glucose and amino acids are transported in solution(water). Fats are synthesized for cell membrane and for storing in seeds.
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The answer of the 40th WAS C
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it was D dude.
cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen
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Heyy
nd what was the answer for which of dese carry glucose
was it arteries only
or arteries and veins
was dat a difficult question or am i just too stupid to have got the wrong answer for that
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it was D dude.
cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen
Sorry man I dont agree with U.
See when oxygen level decreases,the fishes starts to die.
so the number of bacteria increase as they feed on dead fishes.
as from first the oxygen is less they respire anaerobically.
And how can dying of fish decrease oxygen level...???
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Ok i got the Answer.
If anyone uses Study guide of IGCSE for biology by Dave Haywaed
Plz see page no 128.
Highest is oxygen
then Algea
then nitrates
then suspended solids
then sewage fungus
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the sewage one HAS TO be "number of bacteria increase" as the first stage, so i think it started with 4-x-x-x as the order of events...i4got if it was C or D but when sewage is let in2 a river first the no of bacteria increase thats obvious, THEN they start depleting oxygen levels, fish die, and as a result, more anaerobic organisms (hu can survive without O2) are remaining.
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I got the sewage thing wrong for sure. I put B (lol) because I thought the fish get poisoned from the sewage or something.
What did you people put for the Monocot leaf? The answer was D (the one that was long and thin and had veins running the length of the leaf)
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hey can sum1 please tell me de answer for de glucose thing
wat is glucose carried in ??
was it arteries only??
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hey can sum1 please tell me de answer for de glucose thing
wat is glucose carried in ??
was it arteries only??
Nope. It is artery and veins both.
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what about question 29, the one about the yellow and purple genotypes, i put the answer as A but people are telling me its C, it has to be pp as it said one of the parent genotypes were yellow.. therefore, it cant be Pp x PP or PP x Pp
It also had to be in 3:1 ratio..
what about the others, how many marks do you think you're losing?
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hey can sum1 please tell me de answer for de glucose thing
wat is glucose carried in ??
was it arteries only??
Nope. It is artery and veins both.
yes!!! I put areteries and veins.
Im asking again, what did u ppl put for the monocot leaf? The answer is D, the long thin one.
@vivek. Its C. Since its a 3:1 ratio, Pp x Pp is the answer. The offspring will be PP, Pp, Pp, and pp, so 3 purple for 1 yellow. Simple.
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Answer of 29 was Pp x Pp
I think i am not losing any marks ;D ;D but not sure about 40 ??? ??? I wrote C.
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hey can sum1 please tell me de answer for de glucose thing
wat is glucose carried in ??
was it arteries only??
Nope. It is artery and veins both.
yes!!! I put areteries and veins.
Im asking again, what did u ppl put for the monocot leaf? The answer is D, the long thin one.
@vivek. Its C. Since its a 3:1 ratio, PP x Pp is the answer. The offspring will be PP, Pp, Pp, and pp, so 3 purple for 1 yellow. Simple.
Monocoat is D
And if PP X Pp is the answer u r wrong. Because offspring will be PP,PP,Pp and Pp
Therefor all purple. and No yellow.
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it was D dude.
cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen
Sorry man I dont agree with U.
See when oxygen level decreases,the fishes starts to die.
so the number of bacteria increase as they feed on dead fishes.
as from first the oxygen is less they respire anaerobically.
And how can dying of fish decrease oxygen level...???
oxygen levels don't just decrease..they decrease because bacteria respire and use them up. When sewage is added bacteria feed and multiply rapidly. And when the fishes die bacteria feed on them too(fishes r organic matter )...so the level decreases more. So when the levels decrease anaerobically respiring bacteria start to grow(cuz they don't need the oxygen).
Highest is oxygen
then Algea
then nitrates
then suspended solids
then sewage fungus
u have wrongly interpreted it.
i'll explain
Sewage is pumped at X, this causes rise in sewage fungus,suspended solids and nitrates...algae falls as oxygen level falls. Look at the lines properly. At Y sewage fungus also reduce as oxygen depletes, nitrates r used up along with the suspended solids(organic solids). When their number reduces,oxygen levels r restores and algae grows again. I hope uve got it.I'm saying this for ur good...so that u don't repeat ur mistake. If u don't understand it i will explain it again but if u still want to go ahead with ur interpretation i can't say anything.
GOOD LUCK!!!
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Ok i got it.
But anyone know all the options...??????
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hey can sum1 please tell me de answer for de glucose thing
wat is glucose carried in ??
was it arteries only??
Nope. It is artery and veins both.
yes!!! I put areteries and veins.
Im asking again, what did u ppl put for the monocot leaf? The answer is D, the long thin one.
@vivek. Its C. Since its a 3:1 ratio, PP x Pp is the answer. The offspring will be PP, Pp, Pp, and pp, so 3 purple for 1 yellow. Simple.
Monocoat is D
And if PP X Pp is the answer u r wrong. Because offspring will be PP,PP,Pp and Pp
Therefor all purple. and No yellow.
Yeah i mistyped. I edited the post. I meant Pp x Pp, or both heterozygous.
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@friends:did u just -rep me.it's ok if u have but i wanna know cuz sanity_master said there's a problem with the rep system but others' rep seems to remain and mine seems to go down despite all the help i provide
heyy i don't remember the options in the order
but there was
bacteria increase
dissolved oxygen decreases
fishes die
anaerobic bacteria increase
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I didn't -rep U.
And i asking the answers.
like C WAS 2,1,4,3
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@friends:did u just -rep me.it's ok if u have but i wanna know cuz sanity_master said there's a problem with the rep system but others' rep seems to remain and mine seems to go down despite all the help i provide
heyy i don't remember the options in the order
but there was
bacteria increase
dissolved oxygen decreases
fishes die
anaerobic bacteria increase
You think YOU have a problem with rep?
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@friends:did u just -rep me.it's ok if u have but i wanna know cuz sanity_master said there's a problem with the rep system but others' rep seems to remain and mine seems to go down despite all the help i provide
heyy i don't remember the options in the order
but there was
bacteria increase
dissolved oxygen decreases
fishes die
anaerobic bacteria increase
You think YOU have a problem with rep?
haha after looking at yours,definitely.
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@friends:did u just -rep me.it's ok if u have but i wanna know cuz sanity_master said there's a problem with the rep system but others' rep seems to remain and mine seems to go down despite all the help i provide
heyy i don't remember the options in the order
but there was
bacteria increase
dissolved oxygen decreases
fishes die
anaerobic bacteria increase
You think YOU have a problem with rep?
haha after looking at yours,definitely.
AHHH IT WENT DOWN AGAIN!!!!
Ok went back to normal...
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Ok now who the HELL is -repping me.. ??? ??? ??? ???
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@friends:did u just -rep me.it's ok if u have but i wanna know cuz sanity_master said there's a problem with the rep system but others' rep seems to remain and mine seems to go down despite all the help i provide
heyy i don't remember the options in the order
but there was
bacteria increase
dissolved oxygen decreases
fishes die
anaerobic bacteria increase
You think YOU have a problem with rep?
haha after looking at yours,definitely.
AHHH IT WENT DOWN AGAIN!!!!
so unfair for the one's who help
ive tried helping u so many times to bring your rep back to normal but it doesn't work
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Ok now who the HELL is -repping me.. ??? ??? ??? ???
the system is buggered up.
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Ok tell me if u know the ANSWERS of 40
LIKE C was 2-1-4-3
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Ok tell me if u know the ANSWERS of 40
LIKE C was 2-1-4-3
I know it was D but i don't remember the order
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Ok still someone is -repping me >:( >:( >:( >:( >:( >:(
OR
This system is going crazy!!!!!
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Ok still someone is -repping me >:( >:( >:( >:( >:( >:(
This system is going crazy!!!!!
even mine's goin down. >:(
heyy does any1 have the mark scheme for june 2000 and 2001 paper 3 biology
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Ok still someone is -repping me >:( >:( >:( >:( >:( >:(
This system is going crazy!!!!!
even mine's goin down. >:(
heyy does any1 have the mark scheme for june 2000 and 2001 paper 3 biology
No i dont have the mark-scheme of 2000 and 2001
Ok the rep is back to normal ;D ;D ;D ;D
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I agree thukon but A also had a 3:1 ratio, i dont remember the genotypes, but im pretty sure that it was that ratio, additionally, my point was it said said that one of the parent phenotype had one yellow genotype, therefore it cant be Pp for both as 'P' is dominant to 'p', therefore both the phenotypes of the parents would be purple..
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I agree thukon but A also had a 3:1 ratio, i dont remember the genotypes, but im pretty sure that it was that ratio, additionally, my point was it said said that one of the parent phenotype had one yellow genotype, therefore it cant be Pp for both as 'P' is dominant to 'p', therefore both the phenotypes of the parents would be purple..
First of all, one of the parents couldnt be yellow and still combine to give a 3:1 ratio. Its impossible.
And it never said anything like that one parent is yellow. All it asked was what are the genotypes of the parents.
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It can give ratio of 3:1
But 3 yellow is to 1 purple.
pp x Pp
p p
P Pp Pp
p pp pp
1:1 ratio
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wat ws da ans of dat kidney ques......
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wat ws da ans of dat kidney ques......
Artery and Vein
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artery and vein this was little confusing for many students!!
but i got right but i am stuck at the last question i wrote C
can someone plz give the correct answer!
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Plzz see first and second page of this topic.
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q40
bacteria increase=>dissolved oxygen decreases=>fishes die=>anaerobic bacteria increase
kidney
artery AND vein
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q40
bacteria increase=>dissolved oxygen decreases=>fishes die=>anaerobic bacteria increase
kidney
artery AND vein
So which option??
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can anyone xplain hw kidney transport glucose by VEIN?
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does glucose pass in the vein also??
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Does anyone know the answer of the one with the arrow pointing downwards only?
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Does anyone know the answer of the one with the arrow pointing downwards only?
I did stomata as water escapes from it.
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Does anyone know the answer of the one with the arrow pointing downwards only?
I did stomata as water escapes from it.
I really thought that as well...but my friends were saying it was wrong! But it makes senseeeeeeeeeee!!! They were saying xylem..but its not like water goes DOWN the xylem?!
Anyway, i think stomata was right...
What did u get for mutation?
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Does anyone know the answer of the one with the arrow pointing downwards only?
I did stomata as water escapes from it.
I really thought that as well...but my friends were saying it was wrong! But it makes senseeeeeeeeeee!!! They were saying xylem..but its not like water goes DOWN the xylem?!
Anyway, i think stomata was right...
What did u get for mutation?
I wrote A. change in gene bla bla
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Does anyone know the answer of the one with the arrow pointing downwards only?
I did stomata as water escapes from it.
I really thought that as well...but my friends were saying it was wrong! But it makes senseeeeeeeeeee!!! They were saying xylem..but its not like water goes DOWN the xylem?!
Anyway, i think stomata was right...
What did u get for mutation?
i wrote in the stomata as well Bcause xylem carries H2O from the roots UPWARDS 2 the leaves 4 photosynthesis
what dd u guys write for the PRODUCER, i wrote it as A cuz it was a plant , my friends wrote C ,but it was just a dead branch ???
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can anyone xplain hw kidney transport glucose by VEIN?
Ok well, the blood that enters the kidney goes through the artery, which then passes into those tiny nephrons. In the nephron the blood has high concentrations of urea, water, glucose, oxygen. This passes into the glomeroulous and under high pressure passes through to the bowmans capsule. It then passes through to the first coiled tubule where ultra filtration takes place of some glucose and oxygen. It then passes down to the loop of henle where water is absorbed. Then it passes into the second coiled tubule where the final absorbtion of glucose takes place. This glucose absorbed in the first and second coiled tubule then pass into the blood stream through the renal vein. And finally, urea passes into the collecting duct and through to the ureter.
I hope that helped. It seams pretty complicated ;p
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Does anyone know the answer of the one with the arrow pointing downwards only?
I did stomata as water escapes from it.
I really thought that as well...but my friends were saying it was wrong! But it makes senseeeeeeeeeee!!! They were saying xylem..but its not like water goes DOWN the xylem?!
Anyway, i think stomata was right...
What did u get for mutation?
i wrote in the stomata as well Bcause xylem carries H2O from the roots UPWARDS 2 the leaves 4 photosynthesis
what dd u guys write for the PRODUCER, i wrote it as A cuz it was a plant , my friends wrote C ,but it was just a dead branch ???
i put stomata too because it seemed like the logical answer. ;)
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Q40.. D.. as the bacteria will feed on the untreated sewage so it will increase in number...
kidey ...artery only
arrow pointing downwards... stomata
heart ...A
phloem ...fats
4 da plasmolysis Q A .you?
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Q40.. D.. as the bacteria will feed on the untreated sewage so it will increase in number...
kidey ...artery only
arrow pointing downwards... stomata
heart ...A
phloem ...fats
4 da plasmolysis Q A .you?
yea the plasmolysis was A
but what dd u write 4 the produces, was it A too????
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It is obvious it is A. Because it was a creeper which produce food on their own.
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Guys, course its A
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Guys what u wrote for the Heart... ??? ???
I wrote the option with auricle-auricle
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the 40th answer was D..And the heart waz auricle and auricle...i think it was W and X..
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can anyone xplain hw kidney transport glucose by VEIN?
Ok well, the blood that enters the kidney goes through the artery, which then passes into those tiny nephrons. In the nephron the blood has high concentrations of urea, water, glucose, oxygen. This passes into the glomeroulous and under high pressure passes through to the bowmans capsule. It then passes through to the first coiled tubule where ultra filtration takes place of some glucose and oxygen. It then passes down to the loop of henle where water is absorbed. Then it passes into the second coiled tubule where the final absorbtion of glucose takes place. This glucose absorbed in the first and second coiled tubule then pass into the blood stream through the renal vein. And finally, urea passes into the collecting duct and through to the ureter.
I hope that helped. It seams pretty complicated ;p
I think what Natalie is trying to explain..is that..the reason glucose travels through the arterys and veins..is because glucose travels in the blood..to the kidney via the artery.. the blood is then purified in the kidney, but glucose also travels out of the vein..the renal vein. U get me?
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Ppl how can the answer for the aphid and phloem Q be fats when phloem tubes only transport amino acids and sucrose ???
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Ppl how can the answer for the aphid and phloem Q be fats when phloem tubes only transport amino acids and sucrose ???
The question asked what do the aphids LACK in their diet.
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Ppl how can the answer for the aphid and phloem Q be fats when phloem tubes only transport amino acids and sucrose ???
The question asked what do the aphids LACK in their diet.
exactly what i was saying, and im +repping u people, ur too low! wowzers, what did u do?
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i think they lack water...cause phloem transports anmino acids, sucrose and fats..
water is not present..
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i think they lack water...cause phloem transports anmino acids, sucrose and fats..
water is not present..
yes but sap is present. Its not like the substances are transported on their own, the need to be in liquid. And also, that questino was supposed to confuse u..because it was telling u about the phloem to remind u what a phloem is. But then it asked a general question "What do they lack in thier diet"
Ofcourse aphids drink water.. else they would die :X It was trying ton confuzzle u.
But anyway, just do well on paper 3..and nobody cares about one question wrong in a paper that counts only 30 percent .
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Okay..so I'm really depressed...I so messed up the easiest paper on earth..& now im so worried..I'm gonna get like 7-8 questions wrong in this p1...and im so sure the gt will be soaring the skies! I've made such stupid decisions..ahh... if i get a B in p1 will it affect my overall grade? cuz my p6 was good & im hoping the same for p3...why did it have to be a bad day...
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in which year was paper 3 the hardest?
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wt ws the answer for the cilia question?
trap bacteria, or move mucus?
and if u get 5-6 rong, does anyone around wt grade dat is?
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mucus traps bacteria
cilia moves mmucus
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wt ws the answer for the cilia question?
trap bacteria, or move mucus?
and if u get 5-6 rong, does anyone around wt grade dat is?
move mucus.
and 32 out of 40 is usually an A depending on how hard the paper was. So, ur fine :)
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damn, so i think 6 rong :(
bt nyway, Thanks for making me feel better abt the A
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I liked the bio paper :) Hey for the genes thing
Meiosis was identical
mitosis was non-identical (nucleus now has haploid number of chromosomes)
right?
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isnt it 35/40 usually?
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I liked the bio paper :) Hey for the genes thing
Meiosis was identical
mitosis was non-identical (nucleus now has haploid number of chromosomes)
right?
isnt it the other way around? meosis is haploid
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it was D dude.
cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen
exactly
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ERMM.... im confused ??? :-[
I just want to clarify this whole aphid and phloem thing.
The question was : " Aphids feed on the contents of phloem. What do they lack in their diet ? "
And the choices were : A amino acids
B fats
C sucrose
D water
I thot that aphids were green plants that stuck to plants' stems, so they cud produce glucose but needed amino acids as they weren't able to absorb nitrate ions from soil [ we did a question like this once in some ppr 3 but i noe now they were NOT aphids ] so niways i had water and fats COMPLETELY ruled out.
SOOO help me out here.... most ppl here say fats . BUT HOW DO YOU KNOW APHIDS LACK FATS IN THEIR DIET?
Water is ruled out but it cud easily be amino acid and sugars? y fats?
P.S. i chose A.
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I liked the bio paper :) Hey for the genes thing
Meiosis was identical
mitosis was non-identical (nucleus now has haploid number of chromosomes)
right?
isnt it the other way around? meosis is haploid
argh haha yeah so Mitosis is identical
Meiosis is haploid-messed that one up ah well :)
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ERMM.... im confused ??? :-[
I just want to clarify this whole aphid and phloem thing.
The question was : " Aphids feed on the contents of phloem. What do they lack in their diet ? "
And the choices were : A amino acids
B fats
C sucrose
D water
I thot that aphids were green plants that stuck to plants' stems, so they cud produce glucose but needed amino acids as they weren't able to absorb nitrate ions from soil [ we did a question like this once in some ppr 3 but i noe now they were NOT aphids ] so niways i had water and fats COMPLETELY ruled out.
SOOO help me out here.... most ppl here say fats . BUT HOW DO YOU KNOW APHIDS LACK FATS IN THEIR DIET?
Water is ruled out but it cud easily be amino acid and sugars? y fats?
P.S. i chose A.
An aphid is an insect-the answer is fats because the plant makes amino acids and transports them via the phloem-it also transports sucrose, which is dissolved in water, so the only logical answer can be B-yes the plants have FAT but mainly in their fruits (for example the avocado)
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hey can sum1 please tell me de answer for de glucose thing
wat is glucose carried in ??
was it arteries only??
Nope. It is artery and veins both.
yes!!! I put areteries and veins.
Im asking again, what did u ppl put for the monocot leaf? The answer is D, the long thin one.
@vivek. Its C. Since its a 3:1 ratio, PP x Pp is the answer. The offspring will be PP, Pp, Pp, and pp, so 3 purple for 1 yellow. Simple.
Monocoat is D
And if PP X Pp is the answer u r wrong. Because offspring will be PP,PP,Pp and Pp
Therefor all purple. and No yellow.
hey not all were of the same colour most of dem were black n sum were white im tlkin accordin to da pic so it has to be 75% purple so this makes it PpxPp
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no u r wrong the mieosis is non identical and mitosis is identical!!!
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I liked the bio paper :) Hey for the genes thing
Meiosis was identical
mitosis was non-identical (nucleus now has haploid number of chromosomes)
right?
isnt it the other way around? meosis is haploid
argh haha yeah so Mitosis is identical
Meiosis is haploid-messed that one up ah well :)
yep I know now thanks: P
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Does anyone know the answer of the one with the arrow pointing downwards only?
I did stomata as water escapes from it.
it betta be stomata cuz frm da xylem it will even move upwards
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ok it was like a crazy mistake like i did in one of the question ;) ;) :D :D :D LOL
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Hmmm, i put meiosis non-identical and mitosis identical.
And aphids feed on the contents of the phloem, and the phloem does not carry fats, so its safe to assume that aphids lack fats in their diet.
And i put the downward arrow for the stomata.
What did u people put for the monocot leaf?
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i think water is lacking in aphid diet!!!because it is feeding on phloem which contains no water!!
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Hmmm, i put meiosis non-identical and mitosis identical.
And aphids feed on the contents of the phloem, and the phloem does not carry fats, so its safe to assume that aphids lack fats in their diet.
And i put the downward arrow for the stomata.
What did u people put for the monocot leaf?
monocot i did D
guys i thoght da mcq's wer harder dan da previous papers
our batch is quite unlucky i must say
i think i got 6 rong :( wsnt expecting it, i hope i make an A tho :(
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guys about the heart da 2 atrias contract 2geder ryt?
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the answer for this Q is FATS
the plants doesnt transport FATS!!
every1 i know solved it as fats, and my teacher said its fats........no other answer!
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hey da corn 1 was Pp x Pp
and uhh da kidney was artery and vein as da kidney fully reabsorbs da glucose
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guys about the heart da 2 atrias contract 2geder ryt?
yup.
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oh and da goin down 1 i put b as itll go out of da leafe
for A i dnt think its da answer cos da water will pass into da whole leaf first
i think
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i think water is lacking in aphid diet!!!because it is feeding on phloem which contains no water!!
The phloem was trying to confuse you..
how can aphids lack water in their diet?! They would die! Aphids like most living organisms need water to survive.
That question was trying to trick you out on purpose. You had to use the cross methods.
There is def sucrose and amino acids in the plhoem.
but aphids live on water...
soo its fat.. but it doesnt matter. One question- i thought the hardest. Just do well on paper 3 and ur fine..
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lol yeah its only 1 question
i got it wrong >< til now i hav 2 or 3 wrong wich i know of
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lsn i gues i can clear al yr doubts
ok as far heart q it was w n x so ans a
cilia is mucus
nitrate is farm a
then d ans abt tht o2 in blood thing was option b
phloem i m nt sure
last ans is d
monocot was d thin leaf wth parallel veins
then 1 more ans it was artery n veins
n ya tht gentic was Pp x Pp
i gues these were yr doubts rite so i gues i help
if thght helpful then plz appreciate it
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i think water is lacking in aphid diet!!!because it is feeding on phloem which contains no water!!
OMG WHY DO PPL NOT READ THE PREVIOUS POSTS????
The question said the aphids feed on the CONTENTS of the phloem, not the phloem itself.
Till now, only one question wrong. The last one. I put B :P
O2 in blood thing? whats that??
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o2 in blood 0_0
wich question was dat?
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Anyone know the mitosis and meosis question?
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the last Q was about ecology and sewage.......eutrophication thing
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Anyone know the mitosis and meosis question?
i put non identical and identical
which was c
@sanity master
i put D for the last que
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Anyone know the mitosis and meosis question?
i put non identical and identical
which was c
@sanity master
i put D for the last que
I want the question.
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Mitosis-identical
Meiosis-non-identical
(learnt from my mistake :D)
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mitosis - identical
meiosis - non-identical
and im sure i got 100% on my skool exam on dat chapter
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Anyone know the mitosis and meosis question?
i put non identical and identical
which was c
@sanity master
i put D for the last que
I want the question.
k it was what happens in the fdaughter cells at meiosis and mitosis
meiosis mitosis
identical identical
non identical identical
thts all i remember
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for the last question it was D.
it was between C & D, but it only made sense that with an increase in bacteria pop there can only be a decrease in oxygen, and therefore fish die and as there is less oxygen, anaerobic organisms thrive.
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the last Q is D
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for the last question it was D.
it was between C & D, but it only made sense that with an increase in bacteria pop there can only be a decrease in oxygen, and therefore fish die and as there is less oxygen, anaerobic organisms thrive.
yup that's right
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yeah i know i got dat 1 wrong ><
and da phloem 1 ><
but oder dan dat im good lol
da corn 1 was Pp x Pp ryt?
da ratio was 3:1
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what about the diagram of the tree
which one was the producer?
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i think water is lacking in aphid diet!!!because it is feeding on phloem which contains no water!!
The phloem was trying to confuse you..
how can aphids lack water in their diet?! They would die! Aphids like most living organisms need water to survive.
That question was trying to trick you out on purpose. You had to use the cross methods.
There is def sucrose and amino acids in the plhoem.
but aphids live on water...
soo its fat.. but it doesnt matter. One question- i thought the hardest. Just do well on paper 3 and ur fine..
Ok, so what u mean they were asking was what the aphids were UNABLE to obtain rite. damn, i thot they said the phloem thing to ask wat they lack in their diet that they obtain FROM plants' phloems. :(
Seriusly, this ppr was not as easy as i originally thot it was. niways me goin now. Dont wanna know wat else i got wrong :-X
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The leaf was the producer
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The leaf was the producer
oh goodie
thx fo makin my day
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The leaf was the producer
oh goodie
thx fo makin my day
hehe no prob-good luck for paper 3! I'm off now-cya guys :)
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The leaf was the producer
oh goodie
thx fo makin my day
hehe no prob-good luck for paper 3! I'm off now-cya guys :)
good luck 2 u 2
cya
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Guys, whats done is done.
Now, Study for the paper that counts ;D
Its the last stretch!!!!!!!!!!!!!!
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WAAAIIIITTT!!!! WHAT'S THE O2 IN BLOOD QUESTION??? ???
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it was D dude.
cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen
U're totally rite nid!!
It's undoubtedly D
as the procedure does not start from decrease in Oxygen!!!
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WAAAIIIITTT!!!! WHAT'S THE O2 IN BLOOD QUESTION??? ???
i think it was the liver and capillary atho not so sure
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Liver and capillary??? IDK!!!
What did you guys put for the questions about the termites in the damp areas?
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Liver and capillary??? IDK!!!
What did you guys put for the questions about the termites in the damp areas?
what was the qu again?
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About the corn question, I dont know why it isn't D... It said that purple mated with yellow, and for it to be yellow it must be pp! And because some of the "offspring" is also yellow, the purple must be heterozygous. So I think the answer is Pp X pp, answer D.
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About the corn question, I dont know why it isn't D... It said that purple mated with yellow, and for it to be yellow it must be pp! And because some of the "offspring" is also yellow, the purple must be heterozygous. So I think the answer is Pp X pp, answer D.
no cuz the ratio was 3:1
but the Pp and pp produced mostly yellow
but the corn was mostly purple and some yellow
so i think it was C
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About the corn question, I dont know why it isn't D... It said that purple mated with yellow, and for it to be yellow it must be pp! And because some of the "offspring" is also yellow, the purple must be heterozygous. So I think the answer is Pp X pp, answer D.
no cuz the ratio was 3:1
but the Pp and pp produced mostly yellow
but the corn was mostly purple and some yellow
so i think it was C
Yeah youre right. Thanks! :)
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About the corn question, I dont know why it isn't D... It said that purple mated with yellow, and for it to be yellow it must be pp! And because some of the "offspring" is also yellow, the purple must be heterozygous. So I think the answer is Pp X pp, answer D.
no cuz the ratio was 3:1
but the Pp and pp produced mostly yellow
but the corn was mostly purple and some yellow
so i think it was C
What do you mean by "but the Pp and pp produced mostly yellow"? Pp and pp will produce half yellow and half purple.
And the question didnt say anything about purple mating with yellow. It just said purple is dominant over yellow.
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About the corn question, I dont know why it isn't D... It said that purple mated with yellow, and for it to be yellow it must be pp! And because some of the "offspring" is also yellow, the purple must be heterozygous. So I think the answer is Pp X pp, answer D.
no cuz the ratio was 3:1
but the Pp and pp produced mostly yellow
but the corn was mostly purple and some yellow
so i think it was C
the answer C ? what is C ? Pp x Pp ?
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I liked the bio paper :) Hey for the genes thing
Meiosis was identical
mitosis was non-identical (nucleus now has haploid number of chromosomes)
right?
the oposite way round
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it was Pp x Pp
im sure of it a 3:1 ratio
it dint say yellow mated wid purple
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o2 in blood?? 0_0
wat was da question?
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it was D dude.
cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen
U're totally rite nid!!
It's undoubtedly D
as the procedure does not start from decrease in Oxygen!!!
What is D ? it starts with 4 ?
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it was D dude.
cause when sewage is added bacteria feed on the organic matter,using a lot of dissolved oxygen. When this happens fishes have less oxygen to thrive on(they die). When they die it depletes oxygen levels more....so bacteria which do not require oxygen(anaerobically respiring bacteria)will increase cuz they can survive without oxygen
U're totally rite nid!!
It's undoubtedly D
as the procedure does not start from decrease in Oxygen!!!
What is D ? it starts with 4 ?
yup it started wid 4
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WAAAIIIITTT!!!! WHAT'S THE O2 IN BLOOD QUESTION??? ???
wat question is dat?
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WAAAIIIITTT!!!! WHAT'S THE O2 IN BLOOD QUESTION??? ???
wat question is dat?
Kim check ur pm
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WAAAIIIITTT!!!! WHAT'S THE O2 IN BLOOD QUESTION??? ???
wat question is dat?
Kim check ur pm
there is nuthin in their from u!!!!!!
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have a question in bio about the food chain...where the question says which arrow doesn't show the flow of energy!
what did u answer this question?
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About the corn question, I dont know why it isn't D... It said that purple mated with yellow, and for it to be yellow it must be pp! And because some of the "offspring" is also yellow, the purple must be heterozygous. So I think the answer is Pp X pp, answer D.
no cuz the ratio was 3:1
but the Pp and pp produced mostly yellow
but the corn was mostly purple and some yellow
so i think it was C
What do you mean by "but the Pp and pp produced mostly yellow"? Pp and pp will produce half yellow and half purple.
And the question didnt say anything about purple mating with yellow. It just said purple is dominant over yellow.
sorry yep ur right
ma bad
@ig girl
i thought it was C
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have a question in bio about the food chain...where the question says which arrow doesn't show the flow of energy!
what did u answer this question?
i wrote D because the arrow showed that plant eat decomposers which well cant happen!!!!!!!!
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can someone explain the o2 in blood
i dont get tht either
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yes me to i wrote D but i wasn't sure about it so just wanted to ask!
I think it was the arrow that goes from the decomposer to the plant!
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can someone explain the o2 in blood
i dont get tht either
cud sum1 tell me wat the question was cause i dont remember then ill help u
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yes me to i wrote D but i wasn't sure about it so just wanted to ask!
I think it was the arrow that goes from the decomposer to the plant!
I wrote the same thing. D.
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yes me to i wrote D but i wasn't sure about it so just wanted to ask!
I think it was the arrow that goes from the decomposer to the plant!
I wrote the same thing. D.
it has to be D because the rest of the options were all correct
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yes me to i wrote D but i wasn't sure about it so just wanted to ask!
I think it was the arrow that goes from the decomposer to the plant!
yes but doesnt the dead animal have no energy but then the decomposers take energy cuz they respire
@kim
thats the prob i have no idea wot the que is
someone just said it out of nowhere and i dont understand
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yes me to i wrote D but i wasn't sure about it so just wanted to ask!
I think it was the arrow that goes from the decomposer to the plant!
yes but doesnt the dead animal have no energy but then the decomposers take energy cuz they respire
@kim
thats the prob i have no idea wot the que is
someone just said it out of nowhere and i dont understand
i know !i dont even remember such a question in the paper
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Hey guys .. what bout da cobalt chloride question ? what did u choose ?
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Hey guys .. what bout da cobalt chloride question ? what did u choose ?
that was B
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it was definitely B!!!
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i got this answ
Decomposers eat already dead animals so they don't rot. They are at the bottom of the food chain and start the food chain over again. Plants or animals eat decomposers, and animals/ plants eat them, which is eaten by another, and another
which means tht plants do eat decomposers
either tht or my english sucks
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my typed notes are so weird instead of receptor it says relay instead of sensory it says senses and instead of artery it says vein.i hav to correct it as i go along! ;D
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what was the answer for the heart Question?? ???
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what was the answer for the heart Question?? ???
I think its answer A, W and X chambers.
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my typed notes are so weird instead of receptor it says relay instead of sensory it says senses and instead of artery it says vein.i hav to correct it as i go along! ;D
loool u better do or u r going to lose many marks ;)
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which was the heart one?
i selected B and D from this diag
(right ventricle and left auricle)
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which was the heart one?
i selected B and D from this diag
(right ventricle and left auricle)
it's A and B
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yeah I did the same but apparently, every1 did A and B ... :-X
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wt was for the farm one!? which on effects the plants in the water?! i wrote A
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wt was for the farm one!? which on effects the plants in the water?! i wrote A
Same here!
it's a little bit obvious, but at first i thought that there must be a trick!
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yea...same here...lol!
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da water flows right
so da farm b4 point where nitrate was highest was da answer
bt i dnt remember wich farm it was
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like there were bars made...so the farm tht came xactly b4 the highest one was it...is that wt u did?
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There was a question abt small mammals and their growth... it was a graph..
what is the answer?
I put B... all my frnds answered C or D :-[
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hm...i dont remember that question...more details..
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which was the heart one?
i selected B and D from this diag
(right ventricle and left auricle)
it's A and B
explanation please
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It was a graph with 4 phases; A,B,C and D
The question was when is the growth slowing down?
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There was a question abt small mammals and their growth... it was a graph..
what is the answer?
I put B... all my frnds answered C or D :-[
I think the answer is A; its not B, as thats the log phase, not D, as thats the death phase(births=deaths) and as far as I can remember, there was no stationary phase shown, or was there ??? thats why I chose A
:-[ :'(
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The answer was C for the small mammals one. It says as what point does the growth slow down. Thats point C, the point right before the number of mammals stabilizes.
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The answer was C for the small mammals one. It says as what point does the growth slow down. Thats point C, the point right before the number of mammals stabilizes.
aha :(
a new mistake
thx for the explanation :)
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which was the heart one?
i selected B and D from this diag
(right ventricle and left auricle)
it's A and B
explanation please
http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.html visit this site it has a good animation with the explanation
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da answer for da graph is c
cos dey asked when is growth slowd down
at point A growth had just strted
and at point D der was no growth
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hey can sum1 please tell me de answer for de glucose thing
wat is glucose carried in ??
was it arteries only??
Nope. It is artery and veins both.
yes!!! I put areteries and veins.
Im asking again, what did u ppl put for the monocot leaf? The answer is D, the long thin one.
@vivek. Its C. Since its a 3:1 ratio, PP x Pp is the answer. The offspring will be PP, Pp, Pp, and pp, so 3 purple for 1 yellow. Simple.
Monocoat is D
And if PP X Pp is the answer u r wrong. Because offspring will be PP,PP,Pp and Pp
Therefor all purple. and No yellow.
I think C was Pp x Pp....so its right...I think
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yes the answer for the graph was C!! im pretty sure it's right!
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yeah da answer was Pp x Pp
dat is 3:1
u cross dem and get PP Pp Pp pp
hey guys wat did u get for da question about choloplast
palisad or mesophyll??
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yeah da answer was Pp x Pp
dat is 3:1
u cross dem and get PP Pp Pp pp
hey guys wat did u get for da question about choloplast
palisad or mesophyll??
It was palisade. Cuz it asked where did photosynthesis take place.
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awsm iput dat :D
oh and huever wants an explanation to why its da upper 2 chamber for da heart dat contract together
you guys shud study da heart beat
atril systole, its when da atria contract
if they did not contract the heartbeat wud be different
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what was the answer to the energy flow diagram...;i put the one going from decomposers to plants..is that right?
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yeah dats wat i put
cos plants get energy from da sun
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hey guys wat was da answer for da 1st question
i put excretion bt my friend sed its respiration cos it sed metablic ractions or sumtn 0_0
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hey guys wat was da answer for da 1st question
i put excretion bt my friend sed its respiration cos it sed metablic ractions or sumtn 0_0
It was excretion. Respiration is a metabolic reaction, but it's not how you get rid of the waste products of metabloic reactions. To get rid of the waste products of respiration you have to excrete CO2 and H2O.
Well done :D
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Excretion is to remove organisms of toxic
materials, the waste products of metabolism
(chemical reactions in cells including
respiration) and substances in excess of
requirements
Respiration as the chemical reactions that
break down nutrient molecules in living cells
to release energy
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yeah I put in respiration too... but I think its wrong cuz over here it says
Excretion is the removal of toxic materials, the waste products of metabolism, and substances in excess of requirements.
Thats wot it says in the study Guide ..
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heyzz
What did y'all choose for the one tht asked abt the effect of adrenaline when you are frightened:
what happens to the heart rate(breathing rate, I mean) and heart beat?
I circled the breathing rate decreases and the heart beat increases
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heyzz
What did y'all choose for the one tht asked abt the effect of adrenaline when you are frightened:
what happens to the heart rate(breathing rate, I mean) and heart beat?
I circled the breathing rate decreases and the heart beat increases
u breathe faster and ur heart beat increases
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I WROTE INCREASE AND INCREASE IS IT TRUE??? ???
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I WROTE INCREASE AND INCREASE IS IT TRUE??? ???
yea .. i guess so ...
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yes the answer for the graph was C!! im pretty sure it's right!
which graph are you referring to??
the one with the 2 plants..and paper put on either side of the leaves...which turn pink in the presence of water???
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can someone tell me what is the answer of the question in which plant cell was placed in a concentrated solution???
i wrote A with the cell with small vacuole on the edge of the cell!
plz answer!! hurrily!!
??? ???
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da answer was da cell with da shrunk membrane
oh and jake
ig girl is talkin about da graph wich asked about the growth, in wich section of da graph has da growth slowed down and da answer was C
da question your asking i put da answer as B, under leaf X i htink
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hey i am little unsure can u tell me the KEY for the answer A B C or D,there was a shrunk membrane but was in two to 3 small parts is that ur answer!
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Hello guys.. srry to break down convo.. but a great revision link I have jst posted for biology paper 3 if u wud like to have a look.
https://studentforums.biz/index.php/topic,2440.msg43398.html#top
Hope it helps. :)
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hey if any of u guys hav a study guide, can u put it up in this forum. i would like to see it, cuz im quite unsure abt a few things. thanks, wud appreciate it ;)
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hey i am little unsure can u tell me the KEY for the answer A B C or D,there was a shrunk membrane but was in two to 3 small parts is that ur answer!
A. The vacuole pulls away from the membrane. The vacuole never splits into parts.
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thanks man i got it right!!!!!!!!!
w00t!!!!!!!!!!!
:D :D :D :D :D
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can someone explain the o2 in blood
i dont get tht either
hey it was abt to identify x n y remeber
x=lungs n y=blood cells
nw do u get it
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can someone explain the o2 in blood
i dont get tht either
hey it was abt to identify x n y remeber
x=lungs n y=blood cells
nw do u get it
it was body cells not blood cells
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can someone explain the o2 in blood
i dont get tht either
hey it was abt to identify x n y remeber
x=lungs n y=blood cells
nw do u get it
it was body cells not blood cells
yeah body cells srry
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plz explain this: if a sperm can survive for 3 days and an egg for 2,and if ovulation occurs anytime from day 13 to 15,why is the fertile period 7 days???
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If the sperm is injected into the vagina 3 days before ovulation, the egg could get fertilized after 3 days. So take that date as the 10th.
Now if ovulation occurs on the 15th, the ovum survives for 2 days, thats till the 17th, so the egg could get fertilized.
So the 10th to the 17th. Thats 7 days.
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oh ok...thanx a ton!!!!!
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can someone please help me with the menstrual cycle?
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can someone please help me with the menstrual cycle?
Not tooo compicated..
0-4 days- lining breaks down (the bleeding)
4-13 days- uterus lining is built up again
13-28- uterus lining is maintained-awaiting embeddment of zygote
The days are different for everyone- but thats an approximate count.
Now, the hormones.
Oestogen- is to encourage the repair of the uterus lining
progesterone- maintains the lining
FSH and LH (dont know if u have to know it- but oh well)
Follicle Stimuating hormone + luteinizing hormone- to make the ovum
Hope it Helped!
oh and ovulation (when the little egg is realeased-) happens about the 13th day- when the uterus lining is built up
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hey Thanks!!! :D
it did help...u gave me the idea of it!
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oh and estrogen brings about ovulation
but during ovulation both estro and progesterone are low
-
why is progesterone used in the pill?
-
why is progesterone used in the pill?
because the progestrone tricks the boidy into thinking that fertilisation has taken place so no oestrogen is produced so no fertilisation is produced
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visit this site for menstrual cycle
http://msnbcmedia.msn.com/i/msnbc/Components/Interactives/Health/WomensHealth/zFlashAssets/menstrual_cycle_dw2[1].swf
it has everything + animation
hope u like it
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is the brain not involved in reflex actions???
-
no its not
its informed later
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is the brain not involved in reflex actions???
Feflex actions happen without the intervention of the brain!
Example-when pupil constricts on bright light
When u touch a hot plate.....u would remove ur hhands immediately without thinking!
It's a very fast response!
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visit this site for menstrual cycle
http://msnbcmedia.msn.com/i/msnbc/Components/Interactives/Health/WomensHealth/zFlashAssets/menstrual_cycle_dw2[1].swf
it has everything + animation
hope u like it
its not workin...
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r u from U.A.E ??? If yes this site doesn't for guys there....no idea why. I'll try finding another site for u...wait
-
try this http://www.medicalgeek.com/animations/2580-menstrual-cycle-cool-animation.html. i hope it works
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yea...im from the UAE
thankuuuu..life saver..+repp for u :D
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thanx IG girl..
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yea...im from the UAE
thankuuuu..life saver..+repp for u :D
ur welcome
and thanx for the rep
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thanx IG girl..
U welcome...if u didn't understand i can explain again?!
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i got it loud and clear,thanku sooo much....i hate biology sooooo much :'( i cant wait for it to end
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hey can someone explain to me lymphatic system..with all the details?
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hey can someone explain to me lymphatic system..with all the details?
u don't need it in detail. don't befuddle ur brain...relax and know what u need to.
if u really want to see some lymphatic system check the attachment and open with ur internet explorer,mozilla or google chrome
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lol! same problem..not opening!
-
about the aphid question every1 is saying that sucrose is dissolved in water so it itz not water but the truth is that sucrose cannot be dissolved in water!!!!so the answer is WATER!!
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okay try this http://www.lymphoma-net.org/the-lymphatic-system.cfm
im sorry i can't help u anymore cuz ive gotta go. i may come back to help
and i hope this site opens
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about the aphid question every1 is saying that sucrose is dissolved in water so it itz not water but the truth is that sucrose cannot be dissolved in water!!!!so the answer is WATER!!
i don't have time to explain but the ans is fats(it is not transported in the phloem) Don't repeat ur mistake in tom paper in case it comes up.
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i cannot interpret graphs for heartbeat...can any1 help???
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i cannot interpret graphs for heartbeat...can any1 help???
Can u elaborate on that, and i can help you? But u need to explain what exactly, and why?
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ok so u know these questions about graphs of heartbeat in paper 1,they give the graph then ask where valves close and the pulse rate...plz help...i m feeling like i know nothing :'( :'( :'(
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ok so u know these questions about graphs of heartbeat in paper 1,they give the graph then ask where valves close and the pulse rate...plz help...i m feeling like i know nothing :'( :'( :'(
\
Ok, well.. ive never seen something like that before..but if i use my knowledge.. I would think that at every heart beat- the flow of blood increases--and therefore the pressure increases (By the way whats the variables?-like whats on the x and y axis) anyway, and valves stop blood from backflowing..so therfore everytime theres a valve, there is alot large pressure, because it propels the blood upwards and out of the heart- instead of letting it trickle back into the atrium
-
pressure is on the y axis and time on x axis
-
pressure is on the y axis and time on x axis
Yeah so thats right? Im sorry, u want me to explain it again? did u get it..?
-
hey am a noob and i'd like to get A*s ;D
-
i am panicinnnnnnnnggggggggggggggggggg
ok biotechnology??
-
i am panicinnnnnnnnggggggggggggggggggg
ok biotechnology??
wot do ya mean by that?
-
i mean any of you can give me a link where i can study biotechnology or explain it to me
-
so llike the use of microorganisms in food industry and all that?
and fermentation
and use of mo in washing powders?
-
yea like the single celled protein...bread production and yeast and all
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yea like the single celled protein...bread production and yeast and all
ter tell ya the truth i really am not sure
but here is wot i think it means
scp is used to make quorn which is an alternative to meat
yeast is used as a catalyst to make bread dough rise using co2
and uses anaerobic respiration
soo..
c6h1206=co2+c2h5oh
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ok so u know these questions about graphs of heartbeat in paper 1,they give the graph then ask where valves close and the pulse rate...plz help...i m feeling like i know nothing :'( :'( :'(
\
Ok, well.. ive never seen something like that before..but if i use my knowledge.. I would think that at every heart beat- the flow of blood increases--and therefore the pressure increases (By the way whats the variables?-like whats on the x and y axis) anyway, and valves stop blood from backflowing..so therfore everytime theres a valve, there is alot large pressure, because it propels the blood upwards and out of the heart- instead of letting it trickle back into the atrium
no no i got it...thanku!!!!!!!!!
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Green plants can make all the materials(including fats and sucrose)using water,carbon dioxide and salts. They r synthesized from sugar molecules and other molecules produced in photosynthesis.
Glucose and amino acids are transported in solution(water). Fats are synthesized for cell membrane and for storing in seeds.
our science coordinator said look for the language! they said lacking which means that the animal has water but not is enough supply
LOOK for the language!!!!!!!!!