CSEC Biology · January 2007 · 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)7 marksOn the grid provided in Figure 1, draw a graph of the results shown in Table 1.
2. 1(a)(ii)2 marksUsing information from the graph you constructed on page 2, estimate the height of the corn plant on Days 5 and 13.
3. 1(b)3 marksDescribe the pattern of growth shown by the plant over the 36-day period.
4. 1(c)(i)1 markWhat is the likely source of food for the corn plant during the first 6 days?
5. 1(c)(ii)2 marksGive TWO uses of the food obtained by the corn plant during the first 6 days.
6. 1(d)(i)2 marksDescribe the method for obtaining dry mass, including the materials and apparatus necessary.
7. 1(d)(ii)1 markState ONE step to be taken to ensure the accuracy of the results when using this method.
8. 1(d)(iii)1 markGive ONE disadvantage of using dry mass to determine growth.
9. 1(e)(i)2 marksSuggest TWO ways in which the growth of the corn plant would be different over the 36 days, if the soil in which it grew were deficient in nitrogen and magnesium.
10. 1(e)(ii)2 marksExplain how a lack of EACH of the following elements may result in the differences suggested in (e)(i) above: Nitrogen; Magnesium.
11. 1(f)(i)3 marksThe corn seed germinated after a heavy shower of rain, although it had been in the soil for a long period of time. What changes occurred in the seed for germination to take place?
12. 1(f)(ii)2 marksApart from water, state TWO conditions necessary for germination.
13. 2(a)2 marksUsing the information in Figure 2, draw TWO conclusions about the incidence of the disease.
14. 2(b)(i)2 marksGive TWO reasons that may account for the development of osteoporosis with age.
15. 2(b)(ii)2 marksState TWO functions of oestrogen.
16. 2(c)(i)2 marksIf children were to be affected by osteoporosis, suggest TWO likely effects of the disease on their bodies.
17. 2(c)(ii)1 markSuggest a mineral supplement that is likely to be recommended for people suffering from osteoporosis.
18. 2(d)(i)2 marksGive TWO advantages of bone being a living tissue.
19. 2(d)(ii)2 marksApart from support, identify TWO functions of bone.
20. 3(a)(i)4 marksUsing the numbers I - IV, label Figure 3 to indicate where in the menstrual cycle EACH of the following events occur: a) Uterus wall builds up as oestrogen level rises (I) b) Many blood vessels develop (II) c) Shedding…
21. 3(a)(ii)3 marksIdentify TWO hormones involved in the menstrual cycle and give the function of any ONE.
22. 3(b)3 marksState THREE functions of the placenta during development of the foetus.
23. 3(c)(i)3 marksState THREE birth control methods practised by human beings.
24. 3(c)(ii)2 marksSuggest why birth control seems more important in humans than in other populations of mammals.
25. 4(a)(i)3 marksUsing only the letters P, Q and R label the structures on both cells that perform EACH of the following: a) Produce ATP (P) b) Synthesise protein (Q) c) Allow substances to enter and leave the cell (R)
26. 4(a)(ii)2 marksUsing the letters S and T, label the structure on Cell 2 ONLY that performs EACH of the following functions: a) Converts light into chemical energy (S) b) Allows a wide range of substances to pass through (T)
27. 4(b)(i)1 markName structure X shown in Cell 1.
28. 4(b)(ii)2 marksSuggest one process which these cells will not be able to perform. Give a reason for your answer.
29. 4(c)(i)4 marksWhat is likely to occur in Cells 1 and 2 of Figure 4 if they were placed in distilled water for over half-an-hour?
30. 4(c)(ii)2 marksExplain why the changes in Cell 1 might be different from the changes in Cell 2 after half-an-hour in distilled water.
31. 4(d)2 marksAlthough blood cells are in a watery medium (plasma) they do not absorb excessive amounts of water. Explain why this is so.
32. 4(e)2 marksSuggest why a person living at high altitudes requires a relatively large number of red blood cells.
33. 5(a)(i)1 markWater passes over the gill rakers before passing over the filaments. Suggest the function of the gill rakers.
34. 5(a)(ii)1 markIdentify ONE feature observed in Figure 5 that allows the filaments to function efficiently.
35. 5(a)(iii)1 markState ONE OTHER characteristic of the filaments that helps in their function.
36. 5(b)(i)4 marksIdentify TWO structures in the breathing apparatus of humans that have similar functions to the parts of the gills illustrated in Figure 5.
37. 5(c)3 marksState THREE ways in which the lungs of a smoker may be affected by the smoking habit.
38. 5(d)(i)2 marksIdentify TWO OTHER human activities that result in pollution.
39. 5(d)(ii)2 marksIdentify TWO effects of polluted waterways on aquatic life.