CAPE Biology Unit 2 · May/June 2019 · Paper 2

17 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)5 marksIllustrate the flow of energy and nutrients through ecosystems by providing labels for A-F in the flow chart in Figure 1.
2. 1(a)(ii)4 marksExplain the importance of energy flow in an ecosystem.
3. 1(a)(iii)8 marksExplain why only a small percentage of the energy from sunlight that reaches terrestrial environments enters the ecosystem.
4. 1(b)(i)5 marksComplete the diagram in Figure 2 and include labels to illustrate the structure of a mitochondrion.
5. 1(b)(ii)8 marksExplain how the structure of the mitochondrion is important for its function in respiration.
6. 2(a)(i)6 marksOn the grid provided on page 11, plot a line graph of the data provided in Table 1 with time on the x-axis.
7. 2(a)(ii)2 marksState TWO key observations that can be made based on the results of this study.
8. 2(a)(iii)6 marksExplain the mechanisms by which glucagon and insulin function to maintain a normal concentration of glucose in the blood.
9. 2(a)(iv)2 marksComment on the clinical significance of the presence of glucose in the urine.
10. 2(b)6 marksWith reference to the properties of ethylene, analyse its actions to bring about desirable changes in fruits during commercial ripening.
11. 2(c)8 marksIn the space below, construct an annotated flow chart to illustrate the mechanism by which the body responds to reduced blood water content (low water potential). Your flow chart should identify the effector, receptor,…
12. 3(a)(i)1 markAssuming that epidemiologic week 1 (not shown on the graph) was the first week of January, in which month was the first confirmed case of a Zika virus infection recorded?
13. 3(a)(ii)4 marksList FOUR other observations from the data provided in Figure 3. Your statements can refer to the epidemiologic week (instead of month).
14. 3(a)(iii)6 marksExplain the mechanisms by which viruses can be transmitted from an infected to an uninfected person by mosquitoes.
15. 3(b)(i)9 marksWith the aid of a labelled graph showing blood antibody concentration over time after vaccination, explain THREE ways in which vaccinations work to reduce the spread of diseases.
16. 3(b)(ii)2 marksDistinguish between 'natural active immunity' and 'artificial active immunity'.
17. 3(c)8 marksDiscuss FOUR major economic impacts of diseases spread by mosquitoes.