CSEC Biology · May/June 2011 · Paper 2

39 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)4 marksOn the grid provided on page 3, draw a line graph to represent the data shown in Table 1.
2. 1(a)(ii)2 marksAccount for the differences in the shape of the line graphs for Stalks A and B.
3. 1(b)2 marksWrite a suitable aim for this experiment.
4. 1(c)1 markWhich flask represents the control in this investigation?
5. 1(d)2 marksWhat conclusion can be drawn from this data?
6. 1(e)4 marksDescribe the physical processes involved in the movement of water from the soil into the plant roots, up the stem and out through the leaves.
7. 1(f)2 marksDescribe TWO ways in which the xylem is adapted for transporting water within a flowering plant.
8. 1(g)3 marksSuggest THREE ways in which transpiration benefits plants.
9. 1(h)2 marksName a type of transport tissue, OTHER THAN xylem, found in flowering plants and state the composition of the fluid transported in this tissue.
10. 1(i)3 marksOutline ONE difference and TWO similarities between the transport system of flowering plants and that of mammals.
11. 2(a)(i)1 markSuggest ONE reason why humans need oxygen to stay alive.
12. 2(a)(ii)2 marksWrite a chemical equation which summarizes the process for which oxygen is required in living cells.
13. 2(a)(iii)1 markName the process at (a) (ii) above.
14. 2(a)(iv)1 markIn which cell organelle does the process at (a) (iii) take place?
15. 2(b)(i)3 marksDuring his spectacular sprint, Usain Bolt's muscle cells became starved of oxygen. Explain why this happens in exercising muscles.
16. 2(b)(ii)1 markWhat substance is produced in Bolt's muscles which were starved of oxygen?
17. 2(b)(iii)2 marksExplain how the substance in (b) (ii) above could affect Bolt's performance if he continued running for another 10 minutes.
18. 2(c)(i)1 markSome plant species are able to survive in conditions where oxygen is lacking. Name the process by which these plants get their energy.
19. 2(c)(ii)3 marksDescribe the process named in (c) (i) above and state TWO substances produced by this process.
20. 3(a)1 markExplain the unique role of producers in the ecosystem.
21. 3(b)(i)2 marksIdentify A and B.
22. 3(b)(ii)2 marksUsing a named example, explain the role of B in the ecosystem.
23. 3(c)(iii)3 marksGive ONE example of a decomposer and explain how a decomposer releases carbon dioxide to the atmosphere.
24. 3(c)(iv)2 marksSuggest why energy from the sun flows in one direction while materials are cycled within the ecosystem.
25. 3(d)4 marksIn addition to energy, materials are also cycled through various trophic levels and the abiotic environment. Using a diagram of the nitrogen cycle, show FOUR named processes which assist in recycling nitrogen in the…
26. 3(e)1 markState the name of the organism responsible for ONE of the processes named in (c) above.
27. 4(a)2 marksDescribe TWO ways in which a leaf is adapted for the process of photosynthesis.
28. 4(b)(i)7 marksMake a large, clearly labelled drawing to show the distribution of green and non-green areas of one leaf that the student may have used.
29. 4(b)(ii)1 markIndicate, on the same drawing, the part expected to change colour if the leaf had photosynthesized.
30. 4(b)(iii)1 markDescribe the colour change expected if the leaf tested positive for starch.
31. 4(c)4 marksExplain how this investigation could indicate that chlorophyll is needed for photosynthesis. Include the role of chlorophyll in your explanation.
32. 4(d)2 marksGive an explanation for the presence of starch in the parts of a plant that do NOT contain chlorophyll.
33. 5(a)2 marksName TWO substances excreted by the kidney.
34. 5(b)9 marksWith the aid of an annotated diagram, explain how urine is formed in the human kidney.
35. 5(c)4 marksAn analysis of a sample of urine shows the presence of blood cells and glucose. Account for the presence of these substances in the urine.
36. 6(a)(i)8 marksComplete the following table by giving ONE example of EACH of the following categories of disease.
37. 6(a)(ii)1 markCompare the methods used in treating and controlling the pathogenic and physiological diseases named in (a) (i).
38. 6(b)(i)7 marksState what is meant by 'genetic engineering'.
39. 6(b)(ii)1 markDiscuss the possible social, ethical and ecological implications of genetic engineering.