CAPE Biology Unit 2 · May/June 2025 · Paper 2

28 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 marksName the THREE stages of the light-independent reactions that occur in the Calvin cycle, labelled X, Y and Z in Figure 1.
2. 1(a)(ii)2 marksState the functions of reduced NADP+ and ATP in the light-independent reactions.
3. 1(a)(iii)5 marksOutline a suitable procedure for conducting the investigation.
4. 1(b)(i)4 marksGiven the information above, construct a pyramid of energy with corresponding values for the mangrove ecosystem.
5. 1(b)(ii)2 marksDetermine the productivity of the producer in the mangrove ecosystem if 1 000 000 kJ m⁻² yr⁻¹ of energy is provided by sunlight to the mangrove.
6. 1(b)(iii)2 marksState TWO reasons why all the energy available from sunlight is not used by the algae.
7. 1(c)(i)3 marksDefine EACH of the following components of biodiversity: Species diversity, Genetic diversity, Ecosystem diversity.
8. 1(c)(ii)9 marksExplain the impact of climate change on EACH of the following components of biodiversity. You MUST present your response in complete paragraphs: Species diversity, Genetic diversity, Ecosystem diversity.
9. 2(a)(i)2 marksDefine the term 'myogenic'.
10. 2(a)(ii)2 marksState ONE role of EACH of the following structures in the heart during the initiation and coordination of the cardiac cycle: Sinoatrial node (SAN), Purkyne tissue.
11. 2(a)(iii)2 marksUse the information in Figure 2 to calculate the heart rate in beats per minute.
12. 2(a)(iv)1 markUsing the information in Figure 2, state ONE reason why Point X indicates the opening of the semilunar valve of the aorta.
13. 2(a)(v)1 markLabel the graph in Figure 2 using an arrow and the letter Y to show when the atrioventricular valves open.
14. 2(a)(vi)1 markLabel the graph in Figure 2 using a double-ended arrow and the letter Z to show when the ventricle is being filled with blood.
15. 2(b)(i)2 marksDefine the term 'excretion'.
16. 2(b)(ii)2 marksOutline ONE reason why the main nitrogenous waste product excreted by mammals is urea rather than ammonia.
17. 2(b)(iii)5 marksDraw a diagram of the bordered structure shown in Figure 3 in the space provided below.
18. 2(b)(iv)2 marksThe convoluted tubule shown in Figure 3 is adapted for reabsorption. Outline ONE adaptation of the epithelial cells of the proximal convoluted tubule that allows the tubule to carry out its function of reabsorption.
19. 2(c)(i)1 markState ONE reason why there is a difference between the quantity of water in the glomerular filtrate and the quantity of water in the urine.
20. 2(c)(ii)9 marksExplain the differences in the concentration of EACH of the following substances in blood plasma, glomerular filtrate and urine as shown in Table 2. You MUST present your response in complete paragraphs: Large proteins,…
21. 3(a)(i)3 marksIdentify EACH of the structures labelled X-Z in Figure 4.
22. 3(a)(ii)3 marksState ONE function of EACH of the structures labelled X-Z in Figure 4.
23. 3(a)(iii)3 marksExplain the significance of the structure labelled W in Figure 4 to the immune response.
24. 3(a)(iv)4 marksUsing Figure 5, describe how Mabthera/Rituximab is used to treat non-Hodgkin lymphoma.
25. 3(b)(i)5 marksConstruct ONE table to represent the data shown in Figures 6 and 7.
26. 3(b)(ii)2 marksState TWO conclusions which can be made from the data given in Figures 6 and 7 on page 24.
27. 3(b)(iii)2 marksSuggest ONE other strategy that can be used to control dengue transmission in the context of the Caribbean. Give a scientific reason why the strategy suggested would be effective.
28. 3(c)8 marksUsing the data in Table 3 and the information provided, discuss the factors that may affect the distribution of diabetes and cancer in the Caribbean. You MUST present your response in complete paragraphs.