5090/1, May/June 2003 (BIOLOGY)

[abcde]

AOA!
Since the mark scheme of this particular paper is not available and neither are the answers mentioned in the examiner report, I decided to post my answers here. I hope you will go through the paper and check my answers. Thank you very much!
1. B
2. A
3. D
4. A
5. D
6. A
7. C
8. B
9. C
10. A
11. C
12. D
13. B
14. D
15. C
16. A
17. B
18. C
19. D
20. A
21. D
22. C
23. A
24. B
25. C
26. D
27. B
28. B
29. D
30. C
31. D
32. A
33. D
34. D
35. C
36. B
37. B
38. C
39. D
40. B.
Hope they're correct!

 

[abcde]

Anyone?

 

[scouserlfc]

Im currently trying to check the ones i know.

 

[scouserlfc]

ill tell u abt them now.
1.is correct.
2.correct
3.its C ill provide the exp. later.
4.A correct
5.correct
6.yup
7.yup agn
8.A because its part of Large intestine and as the water is goin out and if the body requires more water and in a normal individual almost all water is reabsored look at the book ull find a clear explanation.
9.correct
10.B incisors are the shrp edged teeths
11.correct
12.yup
13.correct
14.D correct
15.yup
16.yup
17.yup
18.correct
19.correct
20.correct
21.correct
22.same
23.same
24.same
25.same
26.same
27.same
28.yup

After this i dont know see the Er it leads u too the answer i looked it for 26.its a little troubling one i guess the Er tells something different to our answer

heres th link to ER http: www.xtremepapers.me/CIE/Cambridge%20O%2 ... 3_er_2.pdf

 

[abcde]

Thanks. Yes, I get its C for 3. I was in a hurry while solving so...
But I'm positive 10 is A!!!
I just learned this about 8. I chose B because in Biology Matters it says "Most of the absorption of waters occurs in the ileum"! Contradictory.. :S

 

[CaptainDanger]

I would like to add to this


10- Is A... for Scouserlfc u must have got that wrong... See Here (abcde) you are correct...

26- Is C... Light slowly became dimmer..... For both of you...

39- Is B for abcde only


abcde U got all the others Correct....

U did well...

38/40

95% Marks....

Congrats!

 

[Nibz]

NOT AT ALL!
Water is mainly absorbed through COLON!
I dont know which option is it though

 

[CaptainDanger]

No

3 is D

You were right in the first post....

 

[CaptainDanger]

I agree with Nibz... And I m sure its Colon....

 

[abcde]

Thanks! but I still think 39 is D! Read the question again, CaptainDanger!
No, I got 37/40.

 

[scouserlfc]

Well nibz i said the same thing

 

[scouserlfc]

Er says 3 is C as nothing moves out and water potential is same,dont know why have fun solving mystery

 

[abcde]

Yeah, I know 3 is C! got it... can you guys please check my other post, too? Thanks!

 

[Nibz]

No, 3 is D!

 

[abcde]

That solution would have the same water potential as the potato tissue, which causes NO change in its length so it's definitely C!

 

[Nibz]

But if you people aren't blind, the length's still decreasing!
On O.5 it stops!$
and 26 is C not D!

 

[CaptainDanger]

Yeah I thnk its D...

And abcde

I did the genotypes which come are

AA Aa aA aa

So probability is .25 (aa only)

 

[CaptainDanger]

But if you people aren't blind, the length's still decreasing!
On O.5 it stops!$
and 26 is C not D!

Yeah 26 is C

 

[CaptainDanger]

Thanks! but I still think 39 is D! Read the question again, CaptainDanger!
No, I got 37/40.

37 are not bad either..

But 38 I think... U got two wrong from the first post....

 

[abcde]

Yes 26 is C.
The percentage change in length is 0 when the conc. is 0.3 mol. Nibz, it's C! Leave this please...
@Captain: your calculation is correct but the question asks :
What is the probability that the offspring that show the recessive characteristic are homozygous?
All recessive offspring are always homozygous so it is D for 39. Hope you understand.