IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: aquarian93 on June 09, 2009, 03:50:49 am
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It's been more than 24 hours since i wrote the paper.
wen can we discuss? wen we're allowed to start discussing, any one can start posting their doubts here k.
good luck :)
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I screwed up the "enzymes from bacteria question". And anybody who wrote genetic engineering, where u put the dna into the plasmid is wrong too.
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yes its rong...u just put da bacteria in a fermentor;add feedstock;it respires and reproduces;and u get the product...it waz a repeated question...plz correct me if i m rong
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yes its rong...u just put da bacteria in a fermentor;add feedstock;it respires and reproduces;and u get the product...it waz a repeated question...plz correct me if i m rong
that's right
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Oo Thanks!!! ;D..i thought it would be rong since i forgot to revise the pastpaper! ;D
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DAMN I HOPE IM NOT THE ONLY PERSON WHO GOT THAT WRONG!!
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What did u guys put for the nitrates processes????
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Which Processes?
Which Variant Did You Have?
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Helps make proteins for growth?
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Helps make proteins for growth?
yupp and enzymers :)
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1) wat did u guys put for the labels of the liver cell?
2) wt did u guys put for the second drawing? hepatic portal vein and small intestine (ileum) rite?
3) how to find the dry mass?
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1) wat did u guys put for the labels of the liver cell?
2) wt did u guys put for the second drawing? hepatic portal vein and small intestine (ileum) rite?
3) how to find the dry mass?
Why do i not remember these questions :( except for the second one. I guess i did a different variant..
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
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Helps make proteins for growth?
yupp and enzymers :)
1.nucleus ;cellmembrane and cytoplasm
2.thts ryt...but i rote heptic artery... :(
3.heat the organism;mass for 80 degree/at low temperature[so it does not burn];after sumtym weigh the mass and heat again;thn after a while weigh the mass again until dry mass is found
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
the last part abt subtracting is ryt... ;D
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dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
I wrote the Same. I think its Right.
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thank god. But i hope i dont get that bad a percentile. I screwed up in some other questions too.
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DRYMASS is to calculate the mass of an organism whn all da water is removed....u rote da complete opposite!!
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the liver cell, i rote cell membrane as well. ws gna do cytoplasm and nucleus, bt instead i did cytoplasm for the thing in da middle and vacuole around cuz it din look like a nucleus (which is usually very dark and doesnt hav dots) and the thing around was plain (like vaculoes, it din hav dots like cytoplasm does)
so yea, i dunno
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@ annieangel. Yeah i know what dry mass is. Thats why i subtracted the amount of water that the plant uptakes.
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DRYMASS is to calculate the mass of an organism whn all da water is removed....u rote da complete opposite!!
Wait.. What I wrote is this:
Take the initial volume of solution then subtract the final volume of solution (1) from it.
Now take the mass of radish and subtract the answer we got in (1)
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over all ws it easy, hard? how do u think the threshold will be?
i thoght it was very long, one thing. it was very "geo" like, u noe sooo many lines for each questions wid like 5 marks and all, weird, haha.
bt it was ok for me i gess
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DRYMASS is to calculate the mass of an organism whn all da water is removed....u rote da complete opposite!!
Wait.. What I wrote is this:
Take the initial volume of solution then subtract the final volume of solution (1) from it.
Now take the mass of radish and subtract the answer we got in (1)
I wrote the same thing.
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I totally messed up with the Natural selection question[5mks]
But the paper was little bit hard compared to 2008.
Threshold will be 50/80 for A
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the water that the plants have taken up is not the only wet mass they have. The water has to be removed completely
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the water that the plants have taken up is not the only wet mass they have. The water has to be removed completely
Yeah I know.
But as they used the same raddish for 6weeks. We cannot dry it. So the Best option Would be what we wrote.
;D ;D ;D ;D ;D
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i jus sed withdraw/dehydrate the plant.
ws a hard question.
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yes its rong...u just put da bacteria in a fermentor;add feedstock;it respires and reproduces;and u get the product...it waz a repeated question...plz correct me if i m rong
NICE!! thats exactly what i put, wrote about the fermenter, but with much more detail :)
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
yea thats wrond dude.... uve gotta bake the radish plant to find the dry mass..!
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the water that the plants have taken up is not the only wet mass they have. The water has to be removed completely
Yeah I know.
But as they used the same raddish for 6weeks. We cannot dry it. So the Best option Would be what we wrote.
;D ;D ;D ;D ;D
who said the radish used is the same for the weeks. It's not possible...and im sorry cuz to find out dry mass u need to kill the organism.
I'll put down exactly what the book says..take a look
Dry mass is often used as a measure of growth, because wet mass varies from day to day. The value for dry mass is obtained by drying out the organism in an oven, but this involves killing it.
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
yea thats wrond dude.... uve gotta bake the radish plant to find the dry mass..!
But the same radish has to be used for 6 weeks. How would you "bake" it without killing it? Thats what the experiment says nid. They measure the growth of the plant for 6 weeks. They wont use different plants.
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DRY MASS IS THE DRY MASS OF AN ORGANISM!!!!YES THE ORGANISM IS KILLED because ITS ALL DRIED UP!!!!
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bake it after 6 weeks...
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They measure the dry mass every week. :D Im getting more and more confident that my answer has a SMALL chance of being correct.
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over all ws it easy, hard? how do u think the threshold will be?
i thoght it was very long, one thing. it was very "geo" like, u noe sooo many lines for each questions wid like 5 marks and all, weird, haha.
bt it was ok for me i gess
agreed the question were lengthy i finished at the last second.
but i liked it because it was easy, because all wat u had to do is put in info
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I totally messed up with the Natural selection question[5mks]
But the paper was little bit hard compared to 2008.
Threshold will be 50/80 for A
hw do u noe abt the threshold? thats quite comforting
guys how did u find the paper!??
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I totally messed up with the Natural selection question[5mks]
But the paper was little bit hard compared to 2008.
Threshold will be 50/80 for A
hw do u noe abt the threshold? thats quite comforting
guys how did u find the paper!??
if this threshold is wrong then it's lower haha because i have never seen something above that for a paper 3 ;) soo RELAX ;)
The Paper was Ok, kinda lengthy with some trickies but i managed :)
and i think everyone did :)
what about you?
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They measure the dry mass every week. :D Im getting more and more confident that my answer has a SMALL chance of being correct.
the marks were 3 for this question....i m sure ull atleast get 1....luk on da bright side...evn 1 mark counts :)
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The natural selection answer was because the sickle cell hetero ppl cant get malaria right? So the survive due to survival of fittest, and they pass the trait onto their children right?
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
yea thats wrond dude.... uve gotta bake the radish plant to find the dry mass..!
But the same radish has to be used for 6 weeks. How would you "bake" it without killing it? Thats what the experiment says nid. They measure the growth of the plant for 6 weeks. They wont use different plants.
they use different plants...im sure..just asked my sir
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The natural selection answer was because the sickle cell hetero ppl cant get malaria right? So the survive due to survival of fittest, and they pass the trait onto their children right?
i got this one rong..i actually got pissed off and i rote a story tht i dnt evn remember!! :D
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
yea thats wrond dude.... uve gotta bake the radish plant to find the dry mass..!
But the same radish has to be used for 6 weeks. How would you "bake" it without killing it? Thats what the
experiment says nid. They measure the growth of the plant for 6 weeks. They wont use different plants.
it says in the Hodder Murray revision guide, By the way, so it s gotta be rite. theres no 2 ways about it, to find the dry mass uve gotta bake the organism, even if cells denature etc etc
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
yea thats wrond dude.... uve gotta bake the radish plant to find the dry mass..!
But the same radish has to be used for 6 weeks. How would you "bake" it without killing it? Thats what the
experiment says nid. They measure the growth of the plant for 6 weeks. They wont use different plants.
it says in the Hodder Murray revision guide, By the way, so it s gotta be rite. theres no 2 ways about it, to find the dry mass uve gotta bake the organism, even if cells denature etc etc
As the plant can't make WATER, they have to absorb it from the solution. So if U subtract the mass of water absorb from the mass of radish u get the dry mass.
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
yea thats wrond dude.... uve gotta bake the radish plant to find the dry mass..!
But the same radish has to be used for 6 weeks. How would you "bake" it without killing it? Thats what the
experiment says nid. They measure the growth of the plant for 6 weeks. They wont use different plants.
it says in the Hodder Murray revision guide, By the way, so it s gotta be rite. theres no 2 ways about it, to find the dry mass uve gotta bake the organism, even if cells denature etc etc
As the plant can't make WATER, they have to absorb it from the solution. So if U subtract the mass of water absorb from the mass of radish u get the dry mass.
no friends it gives increase in wet mass...not dry mass
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well....it actually depends on the examiners mind... :-\
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Now stop the discussen of this question as nor do i will agree with U and nor do U will agree with me.
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well....it actually depends on the examiners mind... :-\
Was the punnet square Hn Hs
Hn HnHn HnHs
Hs HnHs HsHs
Sickle cell - HsHs
Correct ?????
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Now stop the discussen of this question as nor do i will agree with U and nor do U will agree with me.
i'm just trying to help u so that u don't keep a wrong ans in ur mind and go ahead. just correct urself...if sum1 would correct me if i were wrong i would make sure i don't keep my wrong,half knowledge and disagree. But i u insist fine
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The natural selection answer was because the sickle cell hetero ppl cant get malaria right? So the survive due to survival of fittest, and they pass the trait onto their children right?
yuP :)
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well....it actually depends on the examiners mind... :-\
Was the punnet square Hn Hs
Hn HnHn HnHs
Hs HnHs HsHs
Sickle cell - HsHs
Correct ?????
dats wat i did :)
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we HAD to show the punnet square ryt???because i did
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I totally messed up with the Natural selection question[5mks]
But the paper was little bit hard compared to 2008.
Threshold will be 50/80 for A
hw do u noe abt the threshold? thats quite comforting
guys how did u find the paper!??
if this threshold is wrong then it's lower haha because i have never seen something above that for a paper 3 ;) soo RELAX ;)
The Paper was Ok, kinda lengthy with some trickies but i managed :)
and i think everyone did :)
what about you?
yea i found it lengthy as well, i finished like JUST on time, no time to look bak, haha
it was ok, nthng great nthng horrible.
well i hope its 50. i thoght it was 57 dats y :)
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Now stop the discussen of this question as nor do i will agree with U and nor do U will agree with me.
i dnt understand y u wnt agree and thts ok...but i would rather advise u to go open ur txt bk if u dnt believe us...we r just trying to help...no offense....
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if u remember the last question, first subquestion which had sumthin "Suggest three reasons why not all the energy in the wheat crop is available in animal feed" or sumthin like that i wrote:
1) not all the sunlight available to the wheat crop is used by it
2) animal may not eat all of the wheat crop , some of it is undigested
3) wheat crop may use some of its energy for respiration i.e. for growth or active transport
does that make sense?
overall i thot the questions had too many marks! all 3,4, 5 mark questions..loads of questions were overmarkd n were given like 4 or 5 marks..nyway for the table in the first question, i ticked "Scales/scaly skin" for birds, as all textbooks say birds have scales on their feet, but many ppl in my class sed u didnt hav 2 tick it!
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if u remember the last question, first subquestion which had sumthin "Suggest three reasons why not all the energy in the wheat crop is available in animal feed" or sumthin like that i wrote:
1) not all the sunlight available to the wheat crop is used by it
2) animal may not eat all of the wheat crop , some of it is undigested
3) wheat crop may use some of its energy for respiration i.e. for growth or active transport
does that make sense?
overall i thot the questions had too many marks! all 3,4, 5 mark questions..loads of questions were overmarkd n were given like 4 or 5 marks..nyway for the table in the first question, i ticked "Scales/scaly skin" for birds, as all textbooks say birds have scales on their feet, but many ppl in my class sed u didnt hav 2 tick it!
i ticked birds DO hav scales on their feet...
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if u remember the last question, first subquestion which had sumthin "Suggest three reasons why not all the energy in the wheat crop is available in animal feed" or sumthin like that i wrote:
1) not all the sunlight available to the wheat crop is used by it
2) animal may not eat all of the wheat crop , some of it is undigested
3) wheat crop may use some of its energy for respiration i.e. for growth or active transport
does that make sense?
u had to write about
energy loss e.g. energy lost by movement-respiration-heat loss in urine+faeces-not all organism is digested/eaten etc..
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if u remember the last question, first subquestion which had sumthin "Suggest three reasons why not all the energy in the wheat crop is available in animal feed" or sumthin like that i wrote:
1) not all the sunlight available to the wheat crop is used by it
2) animal may not eat all of the wheat crop , some of it is undigested
3) wheat crop may use some of its energy for respiration i.e. for growth or active transport
does that make sense?
overall i thot the questions had too many marks! all 3,4, 5 mark questions..loads of questions were overmarkd n were given like 4 or 5 marks..nyway for the table in the first question, i ticked "Scales/scaly skin" for birds, as all textbooks say birds have scales on their feet, but many ppl in my class sed u didnt hav 2 tick it!
Hey
I cant jude really if what you wrote is correct or not, but it seems ok
This is what I wrote:
1-Some energy is used by the wheat for itself and the process carried out in the plant itself
2-Some Tiny unwanted animals or insects such as rats or cockoraches may be feeding on the wheat too thus
reducing the total energy available for the animals
3-Some energy is wasted when it is flowing through the food chain i.e from the plant to the animals in the form of heat
And YEAh ur right tooo many marks for even small quesations
and for the birds YOU HAVE TO TICK THE SCALES IT IS CORRECT SCALES FOR BIRDS ARE CORRECT
Hope I Helped :)
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For dry mass question, I wrote, take the plants from solution and measure it. (that's what I remember)
I missed the natural selection and glucose concentration.
What did you write for "trophic level question" ?
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can someone check if my reasons are correct?
Thanks,
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SCALES FOR BIRDS IS WRONG.
They want to know which organisms are covered in whatever. So scales/scaly skin is only reptiles and fish.
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I think I did a different variant because dere was nothing about dry mass in my paper( i did Variant 1)
Wat was da answer to the nitrogen cycle processes???? ???
I wrote nitrogen fixation for the first 1 and
ii)decomposition
nitrification
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I ALSO DID THAT AND I WAS COMPLETELY SURPRISED BUT ALSO HORRIFIED ABOUT THE DRY MASS QUESTION AS I FOUND NOTHING ABOUT IT
AND ABOUT 2 PROCESS I WROTE PUTREFICATION WHICH STANDS FOR DECOMPOSITION U WROTE AND NITRIFICATION
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i hv probably made the stupidest mistake evr!!!!!!!
uurrggghhh
curses!!!!
:'(
i wrote cell wall instead of cell membrane.. nd guess wad?? i noticd.. nd as soon as i noticd.. the invigilator was like... "candidates, put uR pens down"
:'(
the bio paper was excrutiatingly long... i hardly got any time to check..
i hd 25 mins left.. i counted hw many questions i hd left nd there were 5.. nd suddenly i notice.. there is a whole new question behind tht.. i hardly got time to read the last question properly altho it was kinda easy....
:'(
it was longer than physics.. >:(
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The exam was HARD!
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if u remember the last question, first subquestion which had sumthin "Suggest three reasons why not all the energy in the wheat crop is available in animal feed" or sumthin like that i wrote:
1) not all the sunlight available to the wheat crop is used by it
2) animal may not eat all of the wheat crop , some of it is undigested
3) wheat crop may use some of its energy for respiration i.e. for growth or active transport
does that make sense?
overall i thot the questions had too many marks! all 3,4, 5 mark questions..loads of questions were overmarkd n were given like 4 or 5 marks..nyway for the table in the first question, i ticked "Scales/scaly skin" for birds, as all textbooks say birds have scales on their feet, but many ppl in my class sed u didnt hav 2 tick it!
Hey
I cant jude really if what you wrote is correct or not, but it seems ok
This is what I wrote:
1-Some energy is used by the wheat for itself and the process carried out in the plant itself
2-Some Tiny unwanted animals or insects such as rats or cockoraches may be feeding on the wheat too thus
reducing the total energy available for the animals
3-Some energy is wasted when it is flowing through the food chain i.e from the plant to the animals in the form of heat
And YEAh ur right tooo many marks for even small quesations
and for the birds YOU HAVE TO TICK THE SCALES IT IS CORRECT SCALES FOR BIRDS ARE CORRECT
Hope I Helped :)
1 and 3 is same wid me :) i hope its rite? :)
i think the other thing i rote, dusnt make sense, so i think ill get 2 marks for it.
the sickle cell anaemia question and energy question in the last page was 5 marks each, it was long and i ws in a hurry, so im scared ill lose a few marks, bt yea i no my answers make sense bt if i had more time, i would explained it better, get wat i mean
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yeah it should be ryt :) LOL
Yeah ofcourse i get, i think everyone or most of the candidates faced a time problem, the exam wasnt that hard, but it like loong and too many 4 and 5 mark questions, the only question i remember was 1 or 2 was the Gene definition and the organ and vessel thingy and the value in the table haha ryt?
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I think I did a different variant because dere was nothing about dry mass in my paper( i did Variant 1)
Wat was da answer to the nitrogen cycle processes???? ???
I wrote nitrogen fixation for the first 1 and
ii)decomposition
nitrification
i din get anything abt nitrogen cycle, so i gess diff variant
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get over biology...it's over
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yeah it should be ryt :) LOL
Yeah ofcourse i get, i think everyone or most of the candidates faced a time problem, the exam wasnt that hard, but it like loong and too many 4 and 5 mark questions, the only question i remember was 1 or 2 was the Gene definition and the organ and vessel thingy and the value in the table haha ryt?
oh ok cool :)
yea it was full of explanations wid soo many lines, and each question had so many marks, so i was like "wth"
yea only the gene definition and the first and second question. all of the exams this time are extra long *sigh*
hopefully the threshold is low :)
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get over biology...it's over
haha yeah! LOL :P
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yeah it should be ryt :) LOL
Yeah ofcourse i get, i think everyone or most of the candidates faced a time problem, the exam wasnt that hard, but it like loong and too many 4 and 5 mark questions, the only question i remember was 1 or 2 was the Gene definition and the organ and vessel thingy and the value in the table haha ryt?
oh ok cool :)
yea it was full of explanations wid soo many lines, and each question had so many marks, so i was like "wth"
yea only the gene definition and the first and second question. all of the exams this time are extra long *sigh*
hopefully the threshold is low :)
yeah!! I hope so too! :)
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get over biology...it's over
haha yeah! LOL :P
lol rite, bt u noe human tedency rite? ;) :P
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dudes dudes please, everything you said guys was right, n this exam waz the hardest of all exams this session, in my opinion the exam would've been easier for me if I revised the first chapters yet, this year's exam is by far harder than last year's. About the time, any problem you face in a question leave it, n solve other stuff that you can solve then work on the hard parts.
Regarding tmrw's exam good luck people, phy is the hardest P1, n wish me luck
.....\m/.....
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get over biology...it's over
haha yeah! LOL :P
lol rite, bt u noe human tedency rite? ;) :P
haha yeah ok :P
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dudes dudes please, everything you said guys was right, n this exam waz the hardest of all exams this session, in my opinion the exam would've been easier for me if I revised the first chapters yet, this year's exam is by far harder than last year's. About the time, any problem you face in a question leave it, n solve other stuff that you can solve then work on the hard parts.
Regarding tmrw's exam good luck people, phy is the hardest P1, n wish me luck
.....\m/.....
nah man Physics p1 is easy
Biology p1 is always the hardest :S :P
Good Luck ALLLLL :D
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hey, if i wrote an answer on the line provided and then rub it and wrote the correct answer below it but not on the line ,is that accepted???
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hey, if i wrote an answer on the line provided and then rub it and wrote the correct answer below it but not on the line ,is that accepted???
no if it is not correct...haha
yes
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the bio xam waz da easiest xam eva except 4 da blood cloting Q it waz 2222 hard :-[ ....and very long .....about the dry mass u can't substract the final mass from the initial masscuz the initial mass may contain some water so it's not the dry mass :)
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I think it was ok, but ya compared to last years it was hard and very long ! I kinda needed 10 more minutes just to go through my answers.
I was a bit stuck in question 4, the one about plant nutrition. And about the dry mass question, you have to kill the plant to get the dry mass, so you can make sure that no water is in the plant.
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the paper wasnt that hard, in fact, it was one of the easiest i solved and it was easier than 2008............its was very long though
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what was the question number for blood clotting ?
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You guys, for the external ears thingy, which vertebrates have it? I wrote amphibians and mammals..
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You guys, for the external ears thingy, which vertebrates have it? I wrote amphibians and mammals..
Just mammals-the pinna(e) its called
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what was the question number for blood clotting ?
can't remember...
but it went along with question how bacteria can make enzyme or something..( this is about fementer)
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what was the question number for blood clotting ?
can't remember...
but it went along with question how bacteria can make enzyme or something..( this is about fementer)
I'm so stupid argh I put a culture not a FERMENTER arrrrrgh-but otherwise it was pretty good :) (lol)
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what was the question number for blood clotting ?
can't remember...
but it went along with question how bacteria can make enzyme or something..( this is about fementer)
I'm so stupid argh I put a culture not a FERMENTER arrrrrgh-but otherwise it was pretty good :) (lol)
cie repeated again this question..
exactly the same!..
thank God, i remembered.. :)
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check oct nov 05 mark scheme question 6c i think. it's got the answer for the enzymes one
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what was the question number for blood clotting ?
can't remember...
but it went along with question how bacteria can make enzyme or something..( this is about fementer)
I'm so stupid argh I put a culture not a FERMENTER arrrrrgh-but otherwise it was pretty good :) (lol)
cie repeated again this question..
exactly the same!..
thank God, i remembered.. :)
Wat was the answer of the blood clot wat is the enzyme used ???
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ah well-silly me for not doing all the past papers I could-only did the 4 most recent...
why do birds have scales???
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dey dint ask wich enzyme was used
dey asked how blood clotting happend and dey sed an enzyme is used
i wrwote about platelets clumping and dey contai fibrinogen wich is changed into fibrin by an enzyme wich hardens and froms a blood clot
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chem was definately better dan bio for me ><
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dey dint ask wich enzyme was used
dey asked how blood clotting happend and dey sed an enzyme is used
i wrwote about platelets clumping and dey contai fibrinogen wich is changed into fibrin by an enzyme wich hardens and froms a blood clot
oh I just did the platelets part-good job for the fibrinogen part that's full marks for you^^
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Amphibians are the only ones that have smooth skin
Fish and reptiles are the only ones with scales (reptile-dry; fish-wet)
Birds and Mammals have No scales-birds have feathers and mammals have no feathers
Mammals are the only ones that have mammary glands (hence the name mammary :P ) and external ears.
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heyy yayyy i got the dry mass one correct
and yeah abt the enzyme bacteria thing i ddnt know wt to write so i just wrote that we put it in the fermenter feedstock then filtration hpoes its correct
yeah one more thing how did u guys do in the very last question abt energy? uhh god i ws solving nd then i saw a question abt acid i ws woow wt acid rain has to do with energy ?
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hey guys,
4 da animal feed que. wasnt da energy in feed more dan energy in wheat?????
but in da que. dey said 'why is da energy in feed less???
soooooooooo >:(
plz help :-*
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chem was definately better dan bio for me ><
uhhhh rlyyy nooo for me bio ws much easier than chem omg chem ws somthin different :-\
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i sed when there's a cut, platelets and damaged tissues secrete chemicals which converts a soluble protein fibrinogen to insoluble fibrin which forms fibres, and a mesh which forms a clot.
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the water that the plants have taken up is not the only wet mass they have. The water has to be removed completely
Yeah I know.
But as they used the same raddish for 6weeks. We cannot dry it. So the Best option Would be what we wrote.
;D ;D ;D ;D ;D
who said the radish used is the same for the weeks. It's not possible...and im sorry cuz to find out dry mass u need to kill the organism.
I'll put down exactly what the book says..take a look
Dry mass is often used as a measure of growth, because wet mass varies from day to day. The value for dry mass is obtained by drying out the organism in an oven, but this involves killing it.
yea nid i wrote the same i wrote dry it in an oven n den weighit using a measurin balance am i correct
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Liver cells - Nucleus, Cytoplasm, and cell membrane. I hope.
Yeah, hepatic portal vein and ileum
dry mass, i put measure the amount of solution uptaken by the plants., and then subtract from original. I think its wrong.
yea thats wrond dude.... uve gotta bake the radish plant to find the dry mass..!
But the same radish has to be used for 6 weeks. How would you "bake" it without killing it? Thats what the
experiment says nid. They measure the growth of the plant for 6 weeks. They wont use different plants.
it says in the Hodder Murray revision guide, By the way, so it s gotta be rite. theres no 2 ways about it, to find the dry mass uve gotta bake the organism, even if cells denature etc etc
As the plant can't make WATER, they have to absorb it from the solution. So if U subtract the mass of water absorb from the mass of radish u get the dry mass.
hey not necesarrily the cells have water frm b4 as well dey need more water to promote further growth so for the dry mass u need to completely dry it out
-
lemme think
i got the dry mass thing rong cuz i jus sed withdraw the water from the plant.
and the enzyme bacteria thing i rote use a fermenter, starch soln is the source, and a water jacket to make the temp constant, dunno if ill get all 3 marks tho ???
and u noe da 3 reasons why the energy decreases from the plants to animal quesiton i think ill lose 1 mark.
-
Birds have external ears...
-
i made so stupid mistakes :( :'( i m losing aprox. 10 marks so is there any chance that i get an A* as il get above 35 in p3 n p6 inshAllah!!
-
If you're getting confused between the variant 1 and 2, there's a new poll+thread for variant 1 :)
-
Birds have external ears...
they do not have external ears..
but they do have middle ear... ;D
-
They do have external ears! I have pet birds myself!
"Birds have external ears but they can't be seen. Most birds have their ear holes covered with tiny feathers specially designed to cut down on wind noise while permitting sound waves to pass through."
*i hope i don't sound arrogant*
-
Yes but birds don't have pinna on ear-which can be moved for maximum efficiency in sound detection.
-
hey guys,
4 da animal feed que. wasnt da energy in feed more dan energy in wheat?????
but in da que. dey said 'why is da energy in feed less???
soooooooooo >:(
plz help :-*
ppl am i rite?????????/
-
producer has to be the most tho
-
They do have external ears! I have pet birds myself!
"Birds have external ears but they can't be seen. Most birds have their ear holes covered with tiny feathers specially designed to cut down on wind noise while permitting sound waves to pass through."
*i hope i don't sound arrogant*
but the answer seems to be only mammal..
sorry dude..
-
how many marks for blood clotting ? i think i got wrong.
-
i wrote dat da plants have to be dehydrated and den weighed i dnt think its ryt ><
birds do not have external ears
da first 3 questions were ez
and da why wud it b more effective for humans to eat da wheat directly i wrote more energy content
less fat content
and more fibre
-
i think da blood clotting was 3 marx
-
how many marks for blood clotting ? i think i got wrong.
i think 3/4..
-
forda calculations i got 19% and x2000
wat did yu guys get??
-
wht was the blood clottin thing exactly
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
-
wht was the blood clottin thing exactly
ana mafi maluum ;( but i guess u had to write about the prothrombin which is then converted to thrombin again some thing happens and then it turns into soluble fibrinogen and then in the end its insoluble fibrin !
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
-
wht was the blood clottin thing exactly
i sed when there's a cut, platelets and damaged tissues secrete chemicals which converts a soluble protein fibrinogen to insoluble fibrin which forms fibres, and a mesh which forms a clot.
-
the calculations are.....
19%
x2000
6.3
-
wht was the blood clottin thing exactly
ana mafi maluum ;(
u to nothin malum
-
yea you are correct....it was 19% and 2000. 6.3 for what ?
anyway if I lose 10-15 marks, any possibilities for an A ?
-
wht was the blood clottin thing exactly
i sed when there's a cut, platelets and damaged tissues secrete chemicals which converts a soluble protein fibrinogen to insoluble fibrin which forms fibres, and a mesh which forms a clot.
i rote a similiar answer
-
ya, dats wat i was confused bout!
hope its their mistake, and we get da marks for da feed que.
lol
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
my friend did da same mistake
you forgot its in mm so it will 120/0.06
-
ya, dats wat i was confused bout!
hope its their mistake, and we get da marks
lol
wht r u tlkin abt
-
i also wrote the same answer for blood clotting, but u need to mention which enzyme converts fibrinogen to fibrin it is thrombin!
i hope u wrote it because it is important!
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
its was 120/0.06 as you had to measure in millimeters
-
wht was the blood clottin thing exactly
in blood plasma,there is soluble protein called fibrinogen. the chemical releases from platelets and the damage tissue set off a chain, causes fibrinogen changes into fibrin.
fibrin is insoluble. it forms fibers. these fibres form a mesh across the wound. red blood cells and platelets will trap in tangle of fibrin fibres, forming blood clot.
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
-
keep in mind that there r variants and answeres maybe different
-
i also wrote the same answer for blood clotting, but u need to mention which enzyme converts fibrinogen to fibrin it is thrombin!
i hope u wrote it because it is important!
Lol well now I know-thanks for the knowledge mate +rep^^ :D
-
keep in mind that there r variants and answeres maybe different
yeah-there's a bio variant 1 topic-lets discuss variant 1 there?
-
wht was the blood clottin thing exactly
in blood plasma,there is soluble protein called fibrinogen. the chemical releases from platelets and the damage tissue set off a chain, causes fibrinogen changes into fibrin.
fibrin is insoluble. it forms fibers. these fibres form a mesh across the wound. red blood cells and platelets will trap in tangle of fibrin fibres, forming blood clot.
Thanks
-
hey guys,
4 da animal feed que. wasnt da energy in feed more dan energy in wheat?????
but in da que. dey said 'why is da energy in feed less???
soooooooooo >:(
plz help :-*
ppl am i rite?????????/
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
its was 120/0.06 as you had to measure in millimeters
haha..!
i forgot..!
how many marks that question?
-
the magnification question was about 2 marks!!
-
i also wrote the same answer for blood clotting, but u need to mention which enzyme converts fibrinogen to fibrin it is thrombin!
i hope u wrote it because it is important!
Lol well now I know-thanks for the knowledge mate +rep^^ :D
i dont think so, dude!
it doesn't say in IGCSE TEXTBOOK....about the which enzyme..
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
-
i also wrote the same answer for blood clotting, but u need to mention which enzyme converts fibrinogen to fibrin it is thrombin!
i hope u wrote it because it is important!
Lol well now I know-thanks for the knowledge mate +rep^^ :D
i dont think so, dude!
it doesn't say in IGCSE TEXTBOOK....about the which enzyme..
but they asked specifically which enzyme was used dont worry even i did not write
-
guyz wht abt da first questin in tht wheat energy loss que wht was it
-
yeah its all about enzyme so u probably need to mention the name of enzyme!
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
-
i also wrote the same answer for blood clotting, but u need to mention which enzyme converts fibrinogen to fibrin it is thrombin!
i hope u wrote it because it is important!
Lol well now I know-thanks for the knowledge mate +rep^^ :D
i dont think so, dude!
it doesn't say in IGCSE TEXTBOOK....about the which enzyme..
but they asked specifically which enzyme was used dont worry even i did not write
it was lipase for fats and pepsin and tripsin for proteins :)
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
-
i also wrote the same answer for blood clotting, but u need to mention which enzyme converts fibrinogen to fibrin it is thrombin!
i hope u wrote it because it is important!
Lol well now I know-thanks for the knowledge mate +rep^^ :D
i dont think so, dude!
it doesn't say in IGCSE TEXTBOOK....about the which enzyme..
but they asked specifically which enzyme was used dont worry even i did not write
it was lipase for fats and pepsin and tripsin for proteins :)
devi ullu it was thrombokinase n thrombin is a clot sum1 wrote the enzymes name as thrombin
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
yea n even redbulls fans
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
yea n even redbulls fans
By the way who the hell r u
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
yea n even redbulls fans
By the way who the hell r u
whts the name of the red bull fan ???
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
yea n even redbulls fans
By the way who the hell r u
whts the name of the red bull fan ???
i thnk devi he ranaway he got scared
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
yea n even redbulls fans
By the way who the hell r u
whts the name of the red bull fan ???
i thnk devi he ranaway he got scared
lolwa kaun hai jo mujhse scared nhi hotaa ?? RED = Danger
-
yea n abt tht sickle cell anaemia que wht did u guyz write abt why does it occur in africa
plz reply
-
forda calculations i got 19% and x2000
wat did yu guys get??
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
yea n even redbulls fans
By the way who the hell r u
whts the name of the red bull fan ???
i thnk devi he ranaway he got scared
lolwa kaun hai jo mujhse scared nhi hotaa ?? RED = Danger
hehe
chal hai this is student forum yaha pe nahi yaha pe onli exams ki baat :)
-
because Africa is affected by malaria also and malaria's virus need oxygen to reproduce in body, so ppl with sickle cell anemia have less oxygen in the re blood cell thus virus cant reproduce and they survive from malaria,hence this remains in generation!!!
simple!
;) ;)
-
Please stick to english so everyone can understand :)
It was a nutural selection question madee
-
because Africa is affected by malaria also and malaria's virus need oxygen to reproduce in body, so ppl with sickle cell anemia have less oxygen in the re blood cell thus virus cant reproduce and they survive from malaria,hence this remains in generation!!!
simple!
;) ;)
i rote tht only ppl who are heterozygous tend to survive hence the population tends to develop sickle shaped rbcs n only those who r heterozygous survives n according to natural selection only the organism which is welll adapted to its surroundings can survive so this one way of adaptation
am i correctin nyway plz temme ???
-
because Africa is affected by malaria also and malaria's virus need oxygen to reproduce in body, so ppl with sickle cell anemia have less oxygen in the re blood cell thus virus cant reproduce and they survive from malaria,hence this remains in generation!!!
simple!
;) ;)
Umm plasmodium doesn't need oxygen to undergo sexual reproduction I thought?
What (I hope its right :) ) happens is that a mosquito carrying the plasmodium pathogen (that causes malaria) bites someone with sickle cell aneamia, and a normal person-the normal person gets malaria and dies-the sickle cell person does not, as they have resistance to it(I don't think you need to write why they have the resistance) Thus, more 'normal' people die, sickle people survive, so natural selection has occured and the sickle people breed and then produce more sickle people, so pop of them increases :)
-
Please stick to english so everyone can understand :)
It was a nutural selection question madee
yup
-
because Africa is affected by malaria also and malaria's virus need oxygen to reproduce in body, so ppl with sickle cell anemia have less oxygen in the re blood cell thus virus cant reproduce and they survive from malaria,hence this remains in generation!!!
simple!
;) ;)
i rote tht only ppl who are heterozygous tend to survive hence the population tends to develop sickle shaped rbcs n only those who r heterozygous survives n according to natural selection only the organism which is welll adapted to its surroundings can survive so this one way of adaptation
am i correctin nyway plz temme ???
i think u r right!
-
Please stick to english so everyone can understand :)
It was a nutural selection question madee
yup
thanks hehe
-
because Africa is affected by malaria also and malaria's virus need oxygen to reproduce in body, so ppl with sickle cell anemia have less oxygen in the re blood cell thus virus cant reproduce and they survive from malaria,hence this remains in generation!!!
simple!
;) ;)
i rote tht only ppl who are heterozygous tend to survive hence the population tends to develop sickle shaped rbcs n only those who r heterozygous survives n according to natural selection only the organism which is welll adapted to its surroundings can survive so this one way of adaptation
am i correctin nyway plz temme ???
i think u r right!
wht did u write
-
Here this is the definite correct thing on everything about malaria:
The mosquito is the vector for the pathogen Plasmodium. Plasmodium multiplies in the stomach wall of the mosquito, then migrates to the salivary glands.
Plasmodium is the protoctist that causes malaria. It can reproduce sexually inside the mosquito, and the resulting variation makes the production of vaccines VERY difficult.
so:
1.An infected mosquito passes on parasites to an uninfected human. Plasmodium passes down the piercing mouthparts from the mosquito's salivary glands.
2. Parasites multiply RAPIDLY in the human liver, and are then released into the blood.
3. Parasites then invade RBCs, where they feed on haemoglobin then multiply by multiple fission. then they burst, etc etc
So the people with Sickle cell must have the abnormal haemoglobin that the plasmodium can't eat or something :)
(I don't think you need THIS much detail in the exam :P lol) :D
-
Here this is the definite correct thing on everything about malaria:
The mosquito is the vector for the pathogen Plasmodium. Plasmodium multiplies in the stomach wall of the mosquito, then migrates to the salivary glands.
Plasmodium is the protoctist that causes malaria. It can reproduce sexually inside the mosquito, and the resulting variation makes the production of vaccines VERY difficult.
so:
1.An infected mosquito passes on parasites to an uninfected human. Plasmodium passes down the piercing mouthparts from the mosquito's salivary glands.
2. Parasites multiply RAPIDLY in the human liver, and are then released into the blood.
3. Parasites then invade RBCs, where they feed on haemoglobin then multiply by multiple fission. then they burst, etc etc
So the people with Sickle cell must have the abnormal haemoglobin that the plasmodium can't eat or something :)
(I don't think you need THIS much detail in the exam :P lol) :D
hey we dont need to noe so much i wanna noe wht exactly shuld be included in the answer
nywayz the info is gud
-
So model answer:
Mosquito carrying malaria virus BITES people who have sickle cell aneamia, and those who don't (1 mark)
The people who don't have the sickle cell aneamia die (1), and those who do have it, don't as they are resistant (1)
So, the resistant people survive and breed, thus creating a higher population of resistant people (1)
:)
-
So model answer:
Mosquito carrying malaria virus BITES people who have sickle cell aneamia, and those who don't (1 mark)
The people who don't have the sickle cell aneamia die (1), and those who do have it, don't as they are resistant (1)
So, the resistant people survive and breed, thus creating a higher population of resistant people (1)
:)
thanx
-
What did you write for question about "uptake nitrate ions" ?
-
genotype:- HN HS HN HS
gametes:- male X female
child:- HS HS
is that correct?!
and for the labeling, the circle wid dots was the nuceus rite?
and the dry mass.. i did TOTAL MASS - MASS OF ABSORPTION OF MINERALS AND WATER <-- correct?
and amphibians also have an external ear correct?
-
Hey guys what do u think will be the expected curve for this years Bio P3 ???
-
I did bad :P .... the genetic questions till the last page was a total mess :( probably a B.
-
SCALES FOR BIRDS IS WRONG.
They want to know which organisms are covered in whatever. So scales/scaly skin is only reptiles and fish.
i think birds hv scales on their feet... :(
-
It wasnt the best test...... Well i hope we all did well...and i hope the threshold is Low :-\
-
SCALES FOR BIRDS IS WRONG.
They want to know which organisms are covered in whatever. So scales/scaly skin is only reptiles and fish.
i think birds hv scales on their feet... :(
yes they do..we had to tick it, because it was written "scales/scaly skin"..
-
teri maa khogaya.
lol i dont know what that means. I heard it on some song on the radio. I live in bangalore, but I dont know HINDI, or any indian language for that matter ( except for my mothertongue (goa ;D) )
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teri maa khogaya.
lol i dont know what that means. I heard it on some song on the radio. I live in bangalore, but I dont know HINDI, or any indian language for that matter ( except for my mothertongue (goa ;D) )
wt dus dat hav to do wid bio? lol
-
what do u all think of the curve this year or how much do we need to get to get an A in bio p3 ? ?
-
I just searched google, for external ears it's amphibians and mammals, I forgot about the birds and their scaly feet :( oh well
-
Scaly feet is WRONG. They want to know the anatomy of the WHOLE bird. And amphibians do NOT have pinna.
@ aquarian. Lots of ppl were speaking hindi in the previous page. lol. i wanted to add on.
-
it waz not hindi buddy it was urdu ;D
-
what was the percentage question?
-
I ticked only mammals as vertebrates having hair/fur where as a friend ticked birds as well.. =S
Dnt knw whse right =S
-
What did you write for question about "uptake nitrate ions" ?
could some 1 answer this ques as eva i dunno the answer
-
which one the active transport part wht exactly was the que
-
Umm... is there anyone else here who completely left more than 10 marks worth of questions in the paper ? ;D
-
Umm... is there anyone else here who completely left more than 10 marks worth of questions in the paper ? ;D
No, but i have already lost 9 marks ;D
-
i didn't know that reptiles and amphibians had external ears. moreover, what did u guys write for the carbondioxide question? ???
-
Umm... is there anyone else here who completely left more than 10 marks worth of questions in the paper ? ;D
No, but i have already lost 9 marks ;D
4get about losing, i completely left like 10-15 marks (as in no hope at all).
Why'd they have to make the paper so long... :(
-
Guys what do u think about the curve, how much to get an A.
-
I ticked only mammals as vertebrates having hair/fur where as a friend ticked birds as well.. =S
Dnt knw whse right =S
I think ur rite..because birds are always descirbed as having feathers not fur or hair...i ticked jst mammals too :)
-
What did you write for question about "uptake nitrate ions" ?
could some 1 answer this ques as eva i dunno the answer
ummm...im not totally sure i wrote dat da plant will b pale and not turgid
and in da oder question im pretty sure about is nitrate iions is used for build up of protein
wich is used to make enzymes and cytoplasms as well as oder features
-
What did you write for question about "uptake nitrate ions" ?
could some 1 answer this ques as eva i dunno the answer
ummm...im not totally sure i wrote dat da plant will b pale and not turgid
and in da oder question im pretty sure about is nitrate iions is used for build up of protein
wich is used to make enzymes and cytoplasms as well as oder features
Oh yeahhh, that question!! I was starting to wonder if i fell asleep or missed a page in the exam haha
Well, i thought since its for protein, the answer was growth and repair of living cells.
The exam was longer than usual, the last section was a complete rush :(
-
yeah i cudnt finish da discontinous variation question bt oder dan dat i think it went well
though not as good as oder papers
and magnesium for chlorophyll
i also messed up in da acid rain question >< i read da question wrong
-
yea..i read the acid rain question wrong also..!! i was so in a hurry 2 finish it..!!
the last ecology part was messed up! the food chain!!
the only thing i foud easy was the glucose level in the blood!
and labelling the diagram...!
i evn messed up the enzyme produced from bacteria questioN!!
ARGH!!
dunno wht im gonna get!
-
me neither
eventhough i dint mess up so badly
my paper dint feel like its gonna get me an A
-
forda calculations i got 19% and x2000
wat did yu guys get??
GOD u guys here too? LOL red bull rocks :P
i think it was 200...
anybody??...12/0.06...
yea dude i did the same but it was 0.06mm
i got 2000 what about 19 % where was dat remind me maddy darling !!!!!
aunty it was tht energy wheat wala question
devi whr r u
redbull's always HERE !!!!!!!
yea n even redbulls fans
By the way who the hell r u
whts the name of the red bull fan ???