CSEC Biology · May/June 2008 · Paper 2

43 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)(i)2 marksCalculate the percentage of air in Sample A. Show your working.
2. 1(a)(ii)2 marksHow do you account for the difference in the proportion of air in Samples A and B?
3. 1(b)(i)2 marksWhat is the volume of water in EACH cylinder as shown in Figure 2? Cylinder 1: Cylinder 2:
4. 1(b)(ii)2 marksWhich measuring cylinder represents drainage from Sample B? Give a reason for your answer.
5. 1(b)(iii)2 marksCalculate the volume of water retained by EACH sample of soil.
6. 1(b)(iv)1 markIdentify ONE source of error in the investigation of soil drainage.
7. 1(b)(v)2 marksExplain why it is important to investigate water retention properties of soils.
8. 1(c)(i)2 marksIdentify TWO features of the organisms observed in Figure 3 which could be used to classify them.
9. 1(c)(ii)1 markName ONE group of soil organisms that is important in the recycling of soil nutrients.
10. 1(c)(iii)2 marksOrganisms 1 and 3 in Figure 3 are usually found under stones or leaf litter. Suggest TWO reasons why these organisms are found in this type of habitat.
11. 1(c)(iv)a)4 marksList the apparatus you would need.
12. 1(c)(iv)b)4 marksDescribe the method you would use.
13. 1(c)(v)a)3 marksDefine the term 'carnivore'.
14. 1(c)(v)b)3 marksGive TWO adaptations that Organism 6 should possess as a carnivore.
15. 2(a)(i)4 marksOn the diagram in Figure 4, label EACH of the parts numbered 1, 2, 3 and 4.
16. 2(a)(ii)2 marksState ONE function of EACH of the parts labelled 2 and 4. Part 2: Part 4:
17. 2(b)(i)3 marksName a partially movable joint.
18. 2(b)(ii)3 marksHow does movement at a partially movable joint differ from movement at the elbow joint?
19. 2(c)2 marksOn the stylised diagram in Figure 5, draw a representation of a pair of antagonistic muscles for flexing and extending the arm.
20. 2(d)4 marksMany older persons replace their hip bone to retain their ability to walk. Suggest TWO reasons why the hip bone can lose its locomotory function.
21. 3(a)(i)2 marksOn the diagram in Figure 6, write the name of the structures labelled I and II.
22. 3(a)(ii)1 markWhat type of cell division is illustrated in Figure 6?
23. 3(a)(iii)2 marksGive TWO reasons for your response in (a) (ii) above.
24. 3(a)(iv)1 markHow many chromosomes would there be in the daughter cells produced in the cell division illustrated in Figure 6?
25. 3(a)(v)2 marksGive TWO advantages to an organism of this type of cell division.
26. 3(b)(i)2 marksWhat is 'genetic engineering'?
27. 3(b)(ii)1 markGive ONE advantage of genetic engineering.
28. 3(b)(iii)2 marksSuggest ONE problem that could arise from genetically modifying an organism.
29. 3(c)2 marksSuggest ONE reason why it is possible to successfully transfer genes from one species to another, yet species under normal conditions do not generally interbreed.
30. 4(a)(i)8 marksExplain why food chains usually begin with a plant species.
31. 4(a)(ii)8 marksUsing an appropriate diagram, show how a plant or animal may belong to more than one food chain.
32. 4(a)(iii)8 marksExplain why the number of organisms decreases at the successive trophic levels.
33. 4(b)(i)7 marksIdentify ONE relationship that is important in biological control and explain how this relationship functions in biological control.
34. 4(b)(ii)7 marksSuggest TWO reasons why biological control is a preferred method of reducing pest populations compared to the use of pesticides.
35. 5(a)(i)9 marksWith the aid of a fully annotated diagram, explain how air reaches the lungs and oxygen is absorbed into the blood stream.
36. 5(a)(ii)9 marksSuggest why it is important for human blood to have a specialised type of cell for oxygen absorption.
37. 5(b)4 marksThe effect of smoke emission from factories on plant leaves is sometimes compared to the effect of cigarette smoke on human lungs. Suggest TWO reasons why this comparison is appropriate.
38. 5(c)2 marksMany governments have passed legislation to reduce the amount of cigarette smoking in public. Explain why governments should consider it their responsibility to reduce smoking in public.
39. 6(a)(i)8 marksHow does the human body defend itself against disease?
40. 6(a)(ii)8 marksIdentify TWO diseases from which the body CANNOT effectively defend itself.
41. 6(a)(iii)8 marksFor any ONE disease you identified at (a) (ii), explain why it is difficult for the body to defend itself from that disease.
42. 6(b)4 marksSuggest TWO biological and TWO social implications of the improper use of antibiotics.
43. 6(c)3 marksAlcohol is sometimes considered an abused drug. Explain why this may be an appropriate description.