CSEC Biology · May/June 2009 · Paper 2

37 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 marksThe distribution of the different plant and animal species changes from the water's edge to the highway. Name TWO additional pieces of apparatus the students will need to investigate the changing distribution of plant…
2. 1(a)(ii)2 marksDescribe how EACH piece of apparatus you named in (a) (i) can be used to study the distribution of plant species in this area.
3. 1(b)(i)1 markState ONE precaution that should be taken when using the quadrat to determine the distribution of the plant species.
4. 1(b)(ii)2 marksCalculate the species density of the small flowering shrub in the area. (Show your working.)
5. 1(b)(iii)2 marksSuggest a reason for such a large number of succulent plants in the area.
6. 1(c)(i)3 marksUsing the information in Table 2 construct a food web with TEN organisms.
7. 1(c)(ii)2 marksExplain why there are usually no more than four trophic levels in a food web.
8. 1(c)(iii)2 marksState TWO physical factors that could affect the population of the organisms that live in the pond.
9. 1(d)(i)4 marksPlot a graph to represent the data shown in Table 3, using the grid provided on page 7.
10. 1(d)(ii)3 marksAccount for the trend in the frog population before and after the hurricane.
11. 1(d)(iii)2 marksSuggest ONE reason why it is useful to study the distribution of frogs.
12. 2(a)6 marksLabel the parts numbered 1 to 6 on the diagram in Figure 2.
13. 2(b)1 markThe rods and cones are specialised cells of the retina which are stimulated by light. What biological term describes such cells?
14. 2(c)2 marksSevere lack of Vitamin A can result in the cornea of the eye becoming dry and thickened. Explain how this condition would affect a person's ability to see.
15. 2(d)(i)4 marksIdentify the eye defects and the lenses in Figure 3 that can be used to correct the defects. Diagram C Eye defect: Corrective lens: Diagram D Eye defect: Corrective lens:
16. 2(d)(ii)2 marksSometimes contact lenses are used to correct eye defects. Suggest TWO precautions one should take when using contact lenses.
17. 3(a)2 marksName ONE function for which the leaf in Figure 4 is suited and suggest how it is BEST suited for that function.
18. 3(b)(i)3 marksUsing THREE arrows only, show on Figure 4 the path of water diffusing from the leaf.
19. 3(b)(ii)2 marksIdentify the structures labelled 1 and 2. Structure 1: Structure 2:
20. 3(b)(iii)1 markName ONE consequence to a herbaceous plant if there is temporary unavailability of water to replace the water lost from the leaves.
21. 3(c)(i)3 marksExplain how water from the soil gets to the leaf in a plant.
22. 3(c)(ii)2 marksExplain how any ONE structural feature of plant cells helps in transport in plants.
23. 3(d)2 marksExplain why all the water taken up by the roots of a plant is NOT lost by evaporation from the leaves.
24. 4(a)(i)8 marksWith the aid of a fully annotated diagram of the kidney (uriniferous) tubule, explain how urine is produced and gets to the bladder.
25. 4(a)(ii)8 marksSuggest why urine production is important in humans.
26. 4(b)3 marksExplain how his body functions to deal with the excess water.
27. 4(c)4 marksSuggest TWO reasons why the plants observed growing along the trail had mechanisms to reduce water loss.
28. 5(a)6 marksUsing a diagram, illustrate how any THREE named processes are involved in the recycling of carbon in nature.
29. 5(b)(i)9 marksSometimes human activity abnormally affects natural cycles. Suggest TWO ways in which human activity contributes to an abnormal rise in levels of atmospheric carbon dioxide.
30. 5(b)(ii)9 marksSuggest ONE likely consequence of abnormally high carbon dioxide levels on ecosystems.
31. 5(b)(iii)9 marksSuggest TWO ways in which carbon dioxide levels can be controlled.
32. 6(a)(i)6 marksDraw a diagram to show the relative positions of the ovaries, uterus, oviduct and cervix of the human female reproductive system.
33. 6(a)(ii)6 marksAnnotate the diagram to identify the functions of the labelled parts.
34. 6(b)(i)6 marksTwo hormones associated with the reproductive cycle of the female are oestrogen and progesterone. What are TWO likely consequences of limited production of these hormones?
35. 6(b)(ii)6 marksWomen of reproductive age are generally advised not to smoke cigarettes. Identify TWO ways in which smoking is likely to harm the developing foetus.
36. 6(c)(i)3 marksState ONE disadvantage of using condoms.
37. 6(c)(ii)3 marksSuggest TWO reasons why choosing a birth control method can be a more difficult issue for the female partner in a marriage than the male.