IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: biro on May 19, 2010, 03:27:02 pm
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#LOL EDITED TITLE IT IS PAPER 6 NOT 3 xD
ALL EXAM WAS LIKE I DOUBTED:
1.Heart and arteries
2.Visible Differences
3.Test of food
4.Germination
WAIT FOR EXPECTATIONS FOR BIOLOGY AND CHEMISTRY PAPER 3 & 1 :)
Ok...Easy and calm down...Studying for tomorrow's test will be easy ISA
Ok First study the Characteristics of the living organism...most probably he would ask you to draw and tell VISIBLE differences between what you've drawn and another organism...Also be sure to know how to calculate magnification (DUH!! ???)...NOTE SOMETIMES HE WOULD ASK YOU TO DRAW ACCURATE MAGNIFICATION...FOR EXAMPLE MAGNIFY BY 2 THEN YOU MUST MAKE SURE THAT EVERYTHING IS DOUBLED
Secondly, study reproduction in plant...reproductive organs, seed dispersal and germination..study images for labels
Thirdly, Study Diffusion and Osmosis...90% there would be a question about it
Fourth, Study tropism...it is an often topic in exams ;)
Fifth, Enzymes...Just know that high temp denatures..low deactivates (can be activated by heating again)...max rate of reaction at optimum temp. (mammals 40 seeds 20-27)
Sixth, TEST OF FOOD....VERY VERY VERY IMPORTANT
Seventh, Labels of heart, lungs, eye, cell, xylem (transports water), phloem (transolcates ammino acids and sucrose), nerve cells (shapes)...
Last, Any experiment that you got in your study notes SHOULD be studied (most of them are logical ones that you can think about in the exams but be sure to atleast read them)
Now I wish you all good luck and hope we all get an A*...study well ;D
N.B add rep please for help with upcoming exams/subjects 8)
And don't forget that there will be a graph question...recommended when he asks to compare two results to say positive/negative correlation than direct/inversely propotion
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Thanks!!!!!
helped alooot ;) ;)
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Thanks!!!!!
helped alooot ;) ;)
you're welcome :D
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hello......Thanks for help
i want to know how to calculate magnification......i dont know
anyone can help?
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hello......Thanks for help
i want to know how to calculate magnification......i dont know
anyone can help?
man thats easy anyway,,,,lets say you have drawn an apple its width was 8 cm...the original given picture's width is 2 cm so 8 divide 2 = 4
If he asks you to find original length of image given and there is a magnification given..for example length of image given 4 cm and magnfication given is 400 so 4 divded 400 = 1/100 cm :)
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can any tell what is tropism?
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can any tell what is tropism?
Geotropism and Phototropism...the growing direction of plant according light and gravity
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biro kuwait?
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Thanks ......it help me alot.......any gusses for paper?
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Thanks ......it help me alot.......any gusses for paper?
An osmosis and diffusion experiment, insects figure and state visible differences and lungs diagram
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biro kuwait?
Egypt bro :)
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hey i have a question....
you know when you draw a line graph do you draw straight lines from one point to the other using your ruler, or is it always a freehand drawing, or a line of best fit?confuseddd
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An osmosis and diffusion experiment, insects figure and state visible differences and lungs diagram
what incests figure?
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For M/J/08 Paper 6, Q.3)b)i):
How do we measure the distance grown (mm) accurately from the diagram. The pollen tube is not a straight line so how do we measure it?
Q.3)a)ii)
Where is the micropyle? Is it the whole in between C at the right-hand side? The big hole?
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Egypt bro :)
t7aya msr enta mdrst a?
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no1 is answering my question :'( :'(
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hey i have a question....
you know when you draw a line graph do you draw straight lines from one point to the other using your ruler, or is it always a freehand drawing, or a line of best fit?confuseddd
i think we have to make a best fit curve.......but i am not sure.....can any one confirm it?
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hey i have a question....
you know when you draw a line graph do you draw straight lines from one point to the other using your ruler, or is it always a freehand drawing, or a line of best fit?confuseddd
Free Hand is preferred most unless mentioned else
what incests figure?
He can bring an insect figure and a arthpod figure and ask you to compare visible features (if you don't know what are these then go and study characteristics of living organisms).
For M/J/08 Paper 6, Q.3)b)i):
How do we measure the distance grown (mm) accurately from the diagram. The pollen tube is not a straight line so how do we measure it?
Q.3)a)ii)
Where is the micropyle? Is it the whole in between C at the right-hand side? The big hole?
Question 1: Try to divide the pollen tube into many straight lines so that you can measure them with your ruler.Don't worry there is always a range for answer like between 5-7 cm for example.
Question 2: It is the hole that pollen tube enters through to fertilize the ovum found inside the ovary (i.e it is the opening leading to the ovule)
t7aya msr enta mdrst a?
Saint Fatima :)
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Question 2: It is the hole that pollen tube enters through to fertilize the ovum found inside the ovary (i.e it is the opening leading to the ovule)
I've attached a picture for the question. I still don't know where is the micropyle. Therefore, which path is correct, the one in blue or the one in red.
Many thanks in advance.
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c
GUYS SORRY IT IS PREFFERED RULED LINE NOT FREE HAND
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How do we work out the SA of the leaf? What method?
And how do we answer this question:
"Describe how you obtained an answer that was as accurate as possible." (2 marks)
Many thanks guys!
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c
What, so the one in red is the right one then? And C is the micropyle?
Many thanks!
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How do we work out the SA of the leaf? What method?
And how do we answer this question:
"Describe how you obtained an answer that was as accurate as possible." (2 marks)
Many thanks guys!
Count squares fully occupied by leaf as one cm...each one with 1/2 area occupied by leaf is counted as 1/2 cm...neglect those with less than 1/2
DONT COUNT SQUARES OCCUPIED BY PETIOLE
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What, so the one in red is the right one then? And C is the micropyle?
Many thanks!
YUP :)
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Count squares fully occupied by leaf as one cm...each one with 1/2 area occupied by leaf is counted as 1/2 cm...neglect those with less than 1/2
DONT COUNT SQUARES OCCUPIED BY PETIOLE
Thanks. How about one's that are nearly occupied (e.g. box on 6th column, 2nd row)
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YUP :)
Thank you! ;)
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Thanks. How about one's that are nearly occupied (e.g. box on 6th column, 2nd row)
ah you mean nearly full...yup counted as 1 :D
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Homies i need help
I cant understand what exactly is "controlling the experiment "
and i also need help in doin paper 6 ....
wish me luck
and By the way paper 4 math sucked today it was so fuckin hard ....
well alhamdouliallah for everything
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I've attached a picture for the question. I still don't know where is the micropyle. Therefore, which path is correct, the one in blue or the one in red.
Many thanks in advance.
This was from the ER for this question. I'm concerned about the 2nd sentance, does it mean the micropyle is not at C, and in fact the blue line is correct? Please can someone explain!
Only a small number of candidates correctly drew the pollen tube which extended down the style
and entered through the micropyle, the gap between the two integuments. The most common error
was to show the pollen tube entering the ovule from the right by the label line for structure C, or to
rule a straight line from the stigma to the ovule.
SOMEONE PLEASE HELP!
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Thanks man very helpful :D Ta7ya masr hina bardoo :P
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Does anyone have any idea? Please see my previous post
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This was from the ER for this question. I'm concerned about the 2nd sentance, does it mean the micropyle is not at C, and in fact the blue line is correct? Please can someone explain!
SOMEONE PLEASE HELP!
I got this answer from my past papers...I solved it with my teacher Dr. Hala Mahfouz (Best IGCSE teacher 2008 & 2009)
Mark Scheme: C – ovule/embryo sac...this means that it must enter through c !!
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Homies i need help
I cant understand what exactly is "controlling the experiment "
and i also need help in doin paper 6 ....
wish me luck
and By the way paper 4 math sucked today it was so f**kin hard ....
well alhamdouliallah for everything
i need some help[ here guys pleeeeaaaaaaaaaaase :'(
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must we know the chemicals used in the experiments byheart? ???
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biro
ana madraset tiba el heya CBS
e7na bnemte7en 3ndoko
CBS lebso azra2 keda :D
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i need some help[ here guys pleeeeaaaaaaaaaaase :'(
Using a control in an experiment.
So say catalase (enzyme) breaks down hydrogen peroxide into water and oxygen.
Then normally, you put the catalase into test tube and see if there is effervescence.
The control for this experiment would be: don't add catalase into test tube, and see what is the observation (should be no effervescene).
Therefore the purpose of the control for this experiment is to ensure that catalse is what causes oxygen to be produced, and not any other factor/variable.
Has that helped?
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ivo
is the control
like
temperature
amount of reactant
kind of seeds
stuff like that?
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ivo
is the control
like
temperature
amount of reactant
kind of seeds
stuff like that?
No those are variables. See my previous post. Hopefully, I've explained it well!
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This was from the ER for this question. I'm concerned about the 2nd sentance, does it mean the micropyle is not at C, and in fact the blue line is correct? Please can someone explain!
SOMEONE PLEASE HELP!
I THINK ITS THE BLUE LINE !!
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must we know the chemicals used in the experiments byheart? ???
depends .. in igcse u dont need to know complex chemicals by heart but jus the usual ones .. anything in specific u want ??
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now guys
i have a question
what r the phases of yeast population like in population curve
source: november 2005 paper 6 question 3 b http://www.freeexampapers.us/IGCSE/Biology/CIE/2005%20Nov/0610_w05_qp_6.pdf
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I THINK ITS THE BLUE LINE !!
Depends what is an integument!
By the way, are you doing the exam tomorrow?
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vin do we hv 2 noe these diagrams???
cz they rent in any of my books!! :-[
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now guys
i have a question
what r the phases of yeast population like in population curve
source: november 2005 paper 6 question 3 b http://www.freeexampapers.us/IGCSE/Biology/CIE/2005%20Nov/0610_w05_qp_6.pdf
Lag phase, Log (exponential) phase, stationary phase, death phase.
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vin do we hv 2 noe these diagrams???
cz they rent in any of my books!! :-[
Nah! You might get asked to draw stuff, but they give you a copy for you to do so anyway!
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and
whats lag phase and log phase and stationary phase
like explain each
we didnt take this and i really need it
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Thanks ;)
releif
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Depends what is an integument!
By the way, are you doing the exam tomorrow?
i was trying to answer ur ques u posted earlier .. about the micropyle ..
yes im taking bio ..
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and
whats lag phase and log phase and stationary phase
like explain each
we didnt take this and i really need it
Here is the answer to your question!
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vin do we hv 2 noe these diagrams???
cz they rent in any of my books!! :-[
dont worry jus understand them .. they are jus to help you for ur understanding .. ;)
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Can anyone explain the diff between Independent, dependent variable. And there was another word... hmm forgot ;D xD
Thanks ;D
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Has that helped?
[/quote]
Ya dude thanks a lot
One more thing paper 3 bio is coming up should i read the book again or should i just go to past papers directly ??
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Here is the answer to your question!
wow thanks ivo
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Has that helped?
Ya dude thanks a lot
One more thing paper 3 bio is coming up should i read the book again or should i just go to past papers directly ??
I would say read it fast. And for the stuff ur not sure about study it. Then just go over the past papers and look for any questions were hard for u
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p3 mostly needs studying!!
but 2 b on the safe side solve a couple of past papers ;)
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BALADAYAAAAAAAAA
IM OBSESSED WID UR SIGNITURE!!!!!!!!
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BALADAYAAAAAAAAA
IM OBSESSED WID UR SIGNITURE!!!!!!!!
U've seen my old one :P :D??
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guys nov 2001 the graph question b(iii) can u answer and explain pls dont tell me tht answer from the ms made by the teacher
Thank You ;D
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hey guys what's the bubble experiment ?? .. please help
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I would say read it fast. And for the stuff ur not sure about study it. Then just go over the past papers and look for any questions were hard for u
thanks dude
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Can anyone explain the diff between Independent, dependent variable. And there was another word... hmm forgot ;D xD
Thanks ;D
Independent variable is "what you change"
Dependent variable is "what you observe" (How it responds to the change made to the independent variable)
Controlled variable is "what you keep the same"
its not that clear but hope atleast u get an idea of what they mean :-[
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Clear baby :D Thaaaankksss :D :)
Fast q, what is the use of the scales on the body of fisshhhhh :)??
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pls guys hlp me with tht question nov 2001 3) b(iii) p6 i need the explaination i hate tht teacher ms sometimes do mistakes
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Clear baby :D Thaaaankksss :D :)
Fast q, what is the use of the scales on the body of fisshhhhh :)??
camouflage i guess
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Clear baby :D Thaaaankksss :D :)
Fast q, what is the use of the scales on the body of fisshhhhh :)??
to protect its body....
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U've seen my old one :P :D??
yup ;)
u signitures r always amazing
i jus cant find something clever 2 put 4 my signiture
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pls guys hlp me with tht question nov 2001 3) b(iii) p6 i need the explaination i hate tht teacher ms sometimes do mistakes
Do u have a link or smth, cuz fep is blocked by my antivirus...
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to protect its body....
also to reduce resistance of water while swimming ;)
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Do u have a link or smth, cuz fep is blocked by my antivirus...
i know right mine too .. =|
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yup ;)
u signitures r always amazing
i jus cant find something clever 2 put 4 my signiture
I would've given u one but i m not sure if i can put it here, its kinda (really) bad :P
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pm me!!!!!!
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here, http://img186.imageshack.us/img186/7680/condoms2545x200.jpg (http://img186.imageshack.us/img186/7680/condoms2545x200.jpg)
I dare u to put it :D
What do u think guys? Can we put it :P??
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Fish have scales for protection. They work like body armor to shield against predators and disease...
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Umm, in maggots (no, not you guys. :P That would be faggots XD ;) ), is positive phototaxis TOWARDS light or away from it?
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Umm, in maggots (no, not you guys. :P That would be faggots XD ;) ), is positive phototaxis TOWARDS light or away from it?
ofc towards. Positive means towards ( warever that is)
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ofc towards. Positive means towards ( warever that is)
Yeah. Just confirming. because one of my friends confused me. :S
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do we have to make a best fit curve or joint line by ruler point to point?
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For Q.3) b) (Attached photo):
Why is green dominant and white recessive?
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do we have to make a best fit curve or joint line by ruler point to point?
Any is fine. You'll get credit for either.
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For Q.3) b) (Attached photo):
Why is green dominant and white recessive?
There are clearly more green than white, proving that green was dominant, and by being so, produced more green than white.
As all conditions, homozygous dominant, or hetrozygous, will have green. so that's majority. Only homozygous recessive will have the white phenotype. So green is more!!
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hey guys what's the bubble experiment ?? .. please help
neone ppl ?
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Any is fine. You'll get credit for either.
r u sure that both r right.....because smebody told me tht only best fit corve is creditted
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r u sure that both r right.....because smebody told me tht only best fit corve is creditted
No joining dot to dot is also fine. Look in the mark schemes, especially the Winter 09 ones :)
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There are clearly more green than white, proving that green was dominant, and by being so, produced more green than white.
As all conditions, homozygous dominant, or hetrozygous, will have green. so that's majority. Only homozygous recessive will have the white phenotype. So green is more!!
Oh I see, and 3:1 ratio of offspring is only because of heterozygous parent genotypes right?
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In the mark scheme it says method of measuring uptake is bubble method.
What is this?
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Umm, in maggots (no, not you guys. :P That would be faggots XD ;) ), is positive phototaxis TOWARDS light or away from it?
taxes is nt dere in 2010 syallabus its out
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For M/J/08 Paper 6, Q.3)b)i):
How do we measure the distance grown (mm) accurately from the diagram. The pollen tube is not a straight line so how do we measure it?
Q.3)a)ii)
Where is the micropyle? Is it the whole in between C at the right-hand side? The big hole?
Which colour is correct?
Guys see the link below. This is such a hard question!
https://studentforums.biz/index.php/topic,7969.msg211375.html#msg211375 (https://studentforums.biz/index.php/topic,7969.msg211375.html#msg211375)
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taxes is nt dere in 2010 syallabus its out
Tropism is isn't it?
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Tropism is isn't it?
tropism is for plants which is dere and taxes is for simple invertebrates which not dere in 2010 igcse bio : :)
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really? :o
r u absolutely sure? ::)
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really? :o
r u absolutely sure? ::)
go read de syallabus
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hey can any1 temme wat 2 draw 4 Q1(a) m/j 2006 p6 URGENT HELPPPP
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hey can any1 temme wat 2 draw 4 Q1(a) m/j 2006 p6 URGENT HELPPPP
You just draw the pod! Copy it but enlarge it
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hey can any1 temme wat 2 draw 4 Q1(a) m/j 2006 p6 URGENT HELPPPP
You draw the open pod.
Label, fruit OR Pod
Nut OR Seed
Stalk
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Guys which one is correct? Blue or red?
Where is the micropyle?
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test for sugar is ......
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Guys which one is correct? Blue or red?
Where is the micropyle?
c is de microphyle
and de red one is de rght one
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Guys which one is correct? Blue or red?
Where is the micropyle?
Blue one !! i;d told u long time ago ..
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Blue one !! i;d told u long time ago ..
Are you sure, some said it's red some said blue!
Also, what is bubble method?
https://studentforums.biz/index.php/topic,7969.msg211967.html#msg211967 (https://studentforums.biz/index.php/topic,7969.msg211967.html#msg211967)
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test for sugar is ......
Reducing Sugar
Add Benedict's Solution
BOIL (not warm)
Succession of colours Blue>green>orange>red .. further along the colour gradient more reducing sugar present ..
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Are you sure, some said it's red some said blue!
Also, what is bubble method?
https://studentforums.biz/index.php/topic,7969.msg211967.html#msg211967 (https://studentforums.biz/index.php/topic,7969.msg211967.html#msg211967)
view the bottom last part of the first image
bubble method means many things .. wat do u want specifically ??
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view the bottom last part of the first image
bubble method means many things .. wat do u want specifically ??
Please see the link:
Here was the question from the past paper:
https://studentforums.biz/index.php/topic,7969.msg211977.html#msg211977 (https://studentforums.biz/index.php/topic,7969.msg211977.html#msg211977)
(sry wrong link before, this is the right one!)
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Are you sure, some said it's red some said blue!
Also, what is bubble method?
https://studentforums.biz/index.php/topic,7969.msg211967.html#msg211967 (https://studentforums.biz/index.php/topic,7969.msg211967.html#msg211967)
green
A = 15
B = 19
total = 34
white
A=7
B=5
total=12
b) greater number of green seedlings indicate that "green" is dominant and "white" is recessive .. both colours present indicates that the parents are heterozygous .. By the way which year and its for how many mrks??
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green
A = 15
B = 19
total = 34
white
A=7
B=5
total=12
b) greater number of green seedlings indicate that "green" is dominant and "white" is recessive .. both colours present indicates that the parents are heterozygous .. By the way which year and its for how many mrks??
Thanks!
This was for Summer 07 and only for 2 marks.
By the way the thing about bubble method I've included in new link from previous post.
Here it is again:
https://studentforums.biz/index.php/topic,7969.msg211977.html#msg211977
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In the mark scheme it says method of measuring uptake is bubble method.
What is this?
What is figure 1.1 about ??
as far as i can comprehend ..
1.take same species of plants
2.same amount of volume of water with dye
3.Same temperature
4.start the experiment at the same time
5.cover with plastc to avoid evaporation
6.repeat the experiment
..
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See there is one type of bubble method where u count the number of bubbles produced by an aquatic plant by using a potometer ..
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What is figure 1.1 about ??
as far as i can comprehend ..
1.take same species of plants
2.same amount of volume of water with dye
3.Same temperature
4.start the experiment at the same time
5.cover with plastc to avoid evaporation
6.repeat the experiment
..
Here is Fig...
By the way, in the mark scheme it says ""method of measuring uptake (of dye/water), either by bubble method or lossof coloured solution/water), so what is bubbble method?
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See there is one type of bubble method where u count the number of bubbles produced by an aquatic plant by using a potometer ..
It's about dye moving up tube or something:
http://www.practicalbiology.org/areas/advanced/exchange-of-materials/transpiration-in-plants/measuring-rate-of-water-uptake-by-a-plant-shoot-using-a-potometer,62,EXP.html
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It's about dye moving up tube or something:
http://www.practicalbiology.org/areas/advanced/exchange-of-materials/transpiration-in-plants/measuring-rate-of-water-uptake-by-a-plant-shoot-using-a-potometer,62,EXP.html
This is it. Measuring bubble moved from starting position.
Do you think that's right?
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can any1 plz help me wid this
"Describe the processes involved in the changes of directional growth of the shoot of the
seedling."
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can any1 plz help me wid this
"Describe the processes involved in the changes of directional growth of the shoot of the
seedling."
Which paper?
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Which paper?
m/j 2006
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m/j 2006
You could say something along the lines:
- Negative geotropism - grows opposite direction to gravity. This ensures shoots grow upwards getting the leaves into sunlight.
- Positive phototropism - grows towards the light. This means leaves expose maximum sruface area to light. They can therefore absorb more light more efficiently for photosynthesis.
- Mention auxin as well.
- Talk about shoots grow because cells multiply by mitosis - leading to growth.
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Umm could someone just tell me all the labels when drawing a fruit or vegetable (like tomato and garlic)
q2 in M/J 08 has a question on this.
Also i've finished studying most of the stuff and am doing past papers i've done all summer examinations from 06-09 any others i should do?
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can any 1 please explain me de stages in de population graphh plllzzzz urgent :'( :'( :'( :'( :'(
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Umm could someone just tell me all the labels when drawing a fruit or vegetable (like tomato and garlic)
q2 in M/J 08 has a question on this.
Also i've finished studying most of the stuff and am doing past papers i've done all summer examinations from 06-09 any others i should do?
wait 10 min
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Umm could someone just tell me all the labels when drawing a fruit or vegetable (like tomato and garlic)
q2 in M/J 08 has a question on this.
Also i've finished studying most of the stuff and am doing past papers i've done all summer examinations from 06-09 any others i should do?
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***Has a food test for fats ever come? (emulsion test) please let me know asap! thanks :]
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is m.j. 2008 easy?!
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what do we have to write in O/N 2006 Q1 c.....
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what do we have to write in O/N 2006 Q1 c.....
in a testtube grinded seed wid water and try 2 dissolve it by shakin. add some bendicts solution and den boil de mixture u vil observe a succesion of colour change from blue >green>orange>red indicatin presence of reducing sugar
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in a testtube grinded seed wid water and try 2 dissolve it by shakin. add some bendicts solution and den boil de mixture u vil observe a succesion of colour change from blue >green>orange>red indicatin presence of reducing sugar
hmmm i have a different question.....its not about reducing sugar its something else...Thanks u for trying to help....maybe u have got the year wrong
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the question is .....Describe how you would compare the rate of uptake of the colored solution by the plant in fig 1.1 with another plant that had its roots cut off.....do we have to write the experiment or the precautions like same temperature etc.....mark scheme is confusing
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for whoever is asking about o/n2006 Q1 c:
two plants of the same species having the same number of leaves one with roots and the other without each are put in a beaker containing the same volume of coloured solution under the same environmental conditions the water loss from the beaker per unit time is measured in both and results are compared
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just came bk from givin' the exam was good only one question was confusing but others were pretty simple
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good luck evy1
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woooot!!!! 4 hours left :o
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3 Hours left! :O :-\
Umm, was it easy? NOTE: MODERATORS, I AM NOT ASKING FOR WHAT ACTUALLY CAME IN THE EXAM, SO NO NEED TO FRET.
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Good luck everyone!
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it was hard-ish/weird/i dont knowif they will accept my answers
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WOW THE EXAM WAS PRETTY EASY :D :D :D :D
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WOW THE EXAM WAS PRETTY EASY :D :D :D :D
D:
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REGARDING THE BIOLOGY SYLLABUS:
1) Has it recently been changed? When?
2) In O/N 2009, Q4 is about specific structure of a kidney, but my textbook doesn't have that! And I just checked the 2010 syllabus, and it's there, so I'm guessing the syllabus has changed since my textbook's publication? I use the Mary Jones Biology textbook.
3) Have there been other changes besides the kidney thing?
Thanks! :)
@Fastal: Yeah, exactly, that totally fits how it was. Randomly weird :(
omg i too use de same book but which question 0/n 2009 r u talkin abut dere is noo such question abut kidneys
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Has that helped?
Ya dude thanks a lot
One more thing paper 3 bio is coming up should i read the book again or should i just go to past papers directly ??
nah ... i think its better to solve past papers more .... ;)