CAPE Biology Unit 2 · 2017 · Paper 2

23 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 marksIdentify the reactants or products labelled A, B, C, D, E and F in Figure 1. Write your answers in the relevant spaces in Figure 1.
2. 1(a)(ii)3 marksExplain the significance of the process labelled X in Figure 1.
3. 1(b)(i)3 marksIn the box below, draw a labelled diagram to show the detailed structure of a mitochondrion. NOTE: No title is required.
4. 1(b)(ii)2 marksOn your diagram, use labelled arrows to identify FOUR key substances of cellular respiration that move out of the mitochondrion.
5. 1(c)3 marksDescribe the changes in the two populations during the period.
6. 2(a)(i)4 marksIdentify the cross sections labelled I and II and for EACH, state ONE observable feature which justifies the given identification.
7. 2(a)(ii)1 markComment on the main function of the region labelled III.
8. 2(a)(iii)3 marksIn BOX II, make a detailed drawing of the cross section labelled II. NOTE: No title or magnification is required.
9. 2(b)(i)3 marksWith reference to the structure of stomata, explain the nature of the relationship between stomata and transpiration.
10. 2(b)(ii)3 marksUsing the data given in Figure 4, compare the general trend in transpiration rates of the plant in still air and under windy conditions.
11. 2(b)(iii)1 markSuggest an explanation for the results obtained for the experiment done under windy conditions.
12. 3(a)(i)4 marksOn the grid provided on page 13, plot a bar chart of the data in Table 1.
13. 3(a)(ii)2 marksState TWO conclusions that can be made based on the data provided in Table 1.
14. 3(b)4 marksDiscuss TWO social consequences of excessive alcohol consumption.
15. 3(c)5 marksDescribe FIVE risk factors that promote the onset of Type 2 diabetes.
16. 4(a)(i)4 marksDiscuss the concept of a limiting factor in photosynthesis.
17. 4(a)(ii)6 marksUsing your knowledge of the light-dependent and light-independent stages of photosynthesis, explain how light intensity and carbon dioxide act as limiting factors.
18. 4(b)5 marksMicroorganisms are primarily responsible for most of the cycling of nitrogen in the biosphere. With reference to the main processes in the nitrogen cycle, outline FOUR key roles of microorganisms in the nitrogen cycle.
19. 5(a)8 marksExplain the mechanisms by which a nerve cell membrane is able to conduct an action potential and give an analysis of TWO factors that affect the rate of conduction.
20. 5(b)7 marksOutline the general principles of hormonal action in animals and discuss the role of hormones in the regulation of blood glucose concentration.
21. 6(a)(i)3 marksDistinguish between the terms 'active immunity' and 'artificial immunity'.
22. 6(a)(ii)6 marksUsing examples, explain the role of vaccination in providing immunity to pathogens.
23. 6(b)6 marksDiscuss THREE factors which may account for the continued spread of HIV in the Caribbean.