CAPE Biology Unit 2 · May/June 2024 · Paper 2

24 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)3 marksList THREE products of the link reaction.
2. 1(a)(ii)1 markState the site of the link reaction.
3. 1(a)(iii)6 marksIdentify the name and function of the structures labelled Q, R and S in Figure 1.
4. 1(a)(iv)5 marksComplete the diagram below to identify the reduced molecules produced. You MUST include the arrows to show where the molecules were produced in the Kreb's cycle.
5. 1(b)(i)2 marksState a suitable hypothesis for the experiment.
6. 1(b)(ii)1 markState a suitable control for the experiment.
7. 1(b)(iii)2 marksIdentify the manipulated and responding variable in this experiment.
8. 1(b)(iv)1 markUsing the data in Table 1, identify which of the two beans respired faster.
9. 1(c)9 marksExplain the function of EACH of the following microorganisms in maintaining tropical rainforest ecosystems as self-sustaining units. You MUST present your response in complete paragraphs. Nitrifying bacteria,…
10. 2(a)(i)5 marksIn the space provided below, draw FOUR adjoining xylem vessels as shown in Figure 4.
11. 2(a)(ii)6 marksComplete Table 2 by stating how EACH of the named structural features of xylem vessels allows them to carry out water transport in a plant.
12. 2(a)(iii)4 marksDescribe how cohesion and capillarity aid in the ascent of water from stem to leaf.
13. 2(b)(i)3 marksExplain how ONE structural feature of the companion cells enables them to carry out their role in sucrose transport.
14. 2(b)(ii)3 marksA carrot is a taproot that can be used in vegetative propagation. Explain how a carrot can act both as a 'source' and a 'sink' at different times.
15. 2(c)9 marksExplain the differences between plant and mammalian transport systems as it relates to the following. You MUST present your response in complete paragraphs. The energy requirements of organism. The mechanism for…
16. 3(a)(i)2 marksDefine the term 'immune response'.
17. 3(a)(ii)2 marksSuggest TWO reasons why memory cells facilitate long-term immunity.
18. 3(a)(iii)6 marksUsing an annotated diagram ONLY, describe the entire sequence of events involved in either a humoral immune response OR a cell-mediated immune response. Your annotated diagram MUST be drawn in the space provided on page…
19. 3(b)(i)5 marksOn the grid provided on page 19, plot the data provided in Table 4 as a bar graph with weight (kg) on the x-axis.
20. 3(b)(ii)2 marksState TWO key deductions based on the results of this study.
21. 3(b)(iii)1 markState ONE link between diabetes and diet.
22. 3(c)(i)2 marksComplete Table 5 by calculating the missing values for Individual A and Individual B.
23. 3(c)(ii)2 marksIdentify whether EACH individual is elite trained (performing at least one hour of daily intense aerobic activity) or untrained (engages in moderate aerobic activity occasionally), based on the values calculated in (c)…
24. 3(c)(iii)8 marksDiscuss how the following improvements in cardiovascular health shown in Figure 6 impact cardiac output. You MUST present your response in complete paragraphs. Vasodilation. Increase in mitochondria.