P1 andp3 AS Biology

[Shada Mohammed]

Hey guys could anyone give any tips on how really to prepare for these papers. I always feel that paper 1 is tricky, and I have practiced a lot and still lose lots of marks.

 

[mr0fisher]

SAME HERE STILL LOOKING FOR TIPS . I WILL POST THE LINK IF I FIND ANY

 

[SherlockHolmes221B]

For paper 1, try solving past papers and every time you get a question wrong, note it down somewhere in your book/copybook/revision guide so that you'll always remember the piece of information you made a mistake in. Reading the chapters again won't hurt either, and you can also write on a separate sheet of paper the information you forget the most. For example, names of enzymes or something like that.

As for paper 3, it depends more on how much you've practiced in the lab. Just keep memorizing food tests and search slides on the internet in order to practice on drawing plan diagrams. Most paper 3 marks are lost due to incorrect decimal places and/or units, so focus on that, too. When making a table to compare two figures, always make sure to make the table with closed boundaries and to have three headings: the compared feature, the first figure, and second figure. Also, be careful when performing calculations for serial dilution, as it might be tricky. When plotting a graph, always draw a line of best fit, unless stated otherwise.

That's all I can think of right now! If anyone has more, please add!

 

[JAVERIA INAM DANISH]

http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_s06_qp_1.pdf
question 6, what could be possible answer and why?

 

[Gummy Beat]

question 6, what could be possible answer and why?

Is it c? if it is i only measured the width of the cell membrane (from top pospholipid head to bot phospholipid head) and got 2 cm=20000000nm. You should know that cell membrane width is around 7-8nm and they even mention it. so mag=img/actual therefore mag= 20000000/8 = 2.5 x10 6.
Hope i helped

 

[JAVERIA INAM DANISH]

thanks it really was helpful!

 

[Gummy Beat]

glad to help. Good luck

 

[JAVERIA INAM DANISH]

39 An insect consumes 180 J of plant material. Of this, 95 J of energy is passed out in the insect’s
faeces and 58 J is used for respiration.

Which percentage of the energy, in the original plant material taken in by the insect, is converted
into biomass?
A 10 % B 15 % C 32 % D 47 %

 

[Gummy Beat]

Is it 15%? If it is, this is what i did: [180-(95+58)]/180. Because the energy converted into biomass is the energy left in the insect after all the loses occured

 

[Mayisha M]

Please help me understand this one. I found this really complicated and I think sth like this will appear on our mj 14 paper as well.

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s13_qp_13.pdf
Number 14.
The answer is C.
Explanation needed

 

[Gummy Beat]

http://papers.xtremepapers.com/CIE/...nd AS Level/Biology (9700)/9700_s13_qp_13.pdf
Number 14.
The answer is C.
Explanation needed

Competitive inhibitors effect decreases by increasing substrate concentration. Thus the rate of reaction increases