CSEC Biology · January 2006 · Paper 2

35 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 marksUse the data in Table 1 to construct a graph showing the percentage decay of fresh green leaves at the temperatures investigated.
2. 1(a)(ii)2 marksIdentify TWO precautions each group should take in setting up their investigations.
3. 1(b)(i)2 marksSuggest ONE conclusion that may be drawn from the information presented in Table 1 and your graph.
4. 1(b)(ii)2 marksGive ONE explanation for the conclusion arrived at in (b)(i) above.
5. 1(b)(iii)2 marksOne club member suggested that at a temperature of 80°C no decay would have occurred. Do you support this view? Explain your answer.
6. 1(c)4 marksOne of the goals of Green Minds is to promote the use of natural fertilizers by gardeners in the school's neighbourhood. Identify FOUR points about fertilisers that club members should provide to the neighbourhood…
7. 1(d)(i)3 marksDescribe how you would prepare the materials and apparatus for investigation illustrated in Figures 1.1 and 1.2.
8. 1(d)(ii)1 markSuggest ONE limitation to the method you described in d (i).
9. 1(d)(iii)1 markHow far did the bubble move in 20 minutes?
10. 1(d)(iv)2 marksEstimate the transpiration rate of the plant in the investigation.
11. 1(d)(v)2 marksSuggest ONE reason why your estimated rate is not necessarily accurate.
12. 1(d)(vi)1 markIdentify ONE external factor that might affect the movement of the bubble.
13. 1(e)(i)2 marksDescribe how the club members could determine the presence of TWO named nutrients in the yam-bean fruit.
14. 1(e)(ii)2 marksState the expected food test results if the nutrients you chose in (e) (i) are present in the fruit.
15. 2(a)(i)2 marksName the parts of the heart labelled I and II in Figure 2.
16. 2(a)(ii)4 marksUsing FOUR arrows only, show on the diagram the direction of blood flow from the pulmonary artery to the aorta.
17. 2(a)(iii)2 marksName TWO structures shown in the diagram that ensure the blood flows in one direction only.
18. 2(b)(i)2 marksDraw ONE conclusion based on the graph.
19. 2(b)(ii)2 marksSuggest TWO reasons why smoking may contribute to heart disease.
20. 2(b)(iii)2 marksIdentify TWO factors besides smoking that could cause the heart to malfunction.
21. 3(a)5 marksFully label the drawings to show the main parts of the seed.
22. 3(b)3 marksAfter soaking in water for twenty-four hours, the part labelled X elongated (grew). What changes took place in the seed to bring about growth in part X?
23. 3(c)3 marksExplain why it is important for plants to produce seeds with large amounts of stored food.
24. 3(d)3 marksIdentify THREE environmental factors that affect the rate of growth of a seedling.
25. 4(a)5 marksLabel the diagrams to show FIVE structures involved in gamete production and transfer.
26. 4(b)(i)1 markPlace an X on the diagram to show where fertilization takes place.
27. 4(b)(ii)2 marksOutline the route a spermatozoon (sperm) must travel from its origin in order to fertilize an egg.
28. 4(b)(iii)2 marksExplain how it is possible for an egg to be fertilized but fail to result in a successful pregnancy.
29. 4(c)(i)2 marksName TWO reproductive hormones produced by a woman.
30. 4(c)(ii)4 marksExplain how the hormones named in (c)(i) on page 9 enable successful reproduction in humans.
31. 5(a)(i)4 marksIdentify TWO biotic and TWO abiotic factors illustrated in the diagram.
32. 5(a)(ii)4 marksSuggest TWO ways in which any of the biotic and abiotic factors interact.
33. 5(b)(i)4 marksSuggest FOUR precautions residents must take to preserve the pond as a natural habitat.
34. 5(b)(ii)2 marksAfter a period of heavy showers an algal bloom appears in the pond. Suggest a reason for this increase in the population of algae in the pond.
35. 5(b)(iii)2 marksExplain ONE possible consequence of the rapid increase in algae population.