A level Biology: Post your doubts here!

[ashcull14]

n

is the answer C?

o its B

 

[salma_69]

its b ure correct thnks

don't mention it

 

[fantastic girl]

Assalamu Alaikum ppl xD
http://studentbounty.com/pastpapers...vel/Biology (9700)/2006 Jun/9700_s06_qp_2.pdf
Q1 a - how are they calculating the diameter of A?
iam not getting the answer :/

 

[ashcull14]

Assalamu Alaikum ppl xD
http://studentbounty.com/pastpapers/Cambridge International Examinations (CIE)/International AS and A Level/Biology (9700)/2006 Jun/9700_s06_qp_2.pdf
Q1 a - how are they calculating the diameter of A?
iam not getting the answer :/

mm......dont u think tht magnification is given 800X...so if u measure the width ...nd apply the formula Mag = observed size/ actual size

 

[ashcull14]

 

[Mahmood Magdy]

View attachment 52510

I think the answer is D

 

[ashcull14]

 

[fantastic girl]

mm......dont u think tht magnification is given 800X...so if u measure the width ...nd apply the formula Mag = observed size/ actual size

yea i did that but not getting 27 :/

 

[ashcull14]

I think the answer is D

how cn u xplain?

 

[ashcull14]

yea i did that but not getting 27 :/

well in examiner report its written tht the given diameters are to be used to calculate the diameter .............may be some ratio is to be used em not sure

 

[fantastic girl]

well in examiner report its written tht the given diameters are to be used to calculate the diameter .............may be some ratio is to be used em not sure

yea wat i thought was they are adding up....20+7 = 27

 

[ashcull14]

 

[Mahmood Magdy]

View attachment 52510

Well, we will have to break down the graph and think of them separately, cuz if you get the first graph right, the rest is fine and vice versa.
During winter, the producers pop will be low as the light intensity decreases during the winter, but that will result in an increase in the nutrients level and it will reach its maximum level. Therefore A is the quantity of nutrients. Now as me move on, A decreases significantly and the only graph showing a rapid increase is C which will obvs be producers. This will lead to an increase in D. B is the light intensity as it does not depend on any of the other graphs.

 

[ashcull14]

17 Which statement about a diploid cell is not correct?
A It can undergo a mitotic division to allow growth to occur.
B It can undergo a mitotic division to repair a cell.
C It can undergo a reduction division to form haploid cells.
D It is one that possesses two complete sets of chromosomes.

 

[qwertypoiu]

View attachment 52516

1- atrioventricular valve closes
2- semilunar valve opens
3- semilunar valve closes
4- atrioventricular valve opens
Time when both valves are closed is therefore between 1 and 2, and also between 3 and 4.
So total time = 0.03 + 0.04 = 0.07seconds
C

 

[qwertypoiu]

17 Which statement about a diploid cell is not correct?
A It can undergo a mitotic division to allow growth to occur.
B It can undergo a mitotic division to repair a cell.
C It can undergo a reduction division to form haploid cells.
D It is one that possesses two complete sets of chromosomes.

B.
A damaged cell can never be repaired. When cells are damaged phagocytes perhaps destroy them. By mitosis, healthy cells can produce more cells, to replace the old cells, and thus repair a damaged tissue

 

[qwertypoiu]

View attachment 52512

I think it's B

 

[Joker006]

Can someone please help out and tell me why the answer is only 2? (D)

 

[qwertypoiu]

plz plz help! thank you

 

[Mahnoorfatima]

Paper 12 question 35 and 36??https://docs.google.com/viewerng/vi.../11/9700_Oct-Nov-2010-All-Question-Papers.pdf