CAPE Biology Unit 1 · May/June 2022 · Paper 2

25 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 marksIn the space provided, construct a plan diagram to show at least the FOUR major tissues labelled W, X, Y and Z in the light micrograph in Figure 1.
2. 1(a)(ii)4 marksState the function of the structures labelled W, X, Y and Z in Figure 1 on page 4.
3. 1(a)(iii)3 marksExplain why the dicotyledonous root of a plant is considered an organ.
4. 1(b)(i)2 marksOutline the basis of the endosymbiont theory.
5. 1(b)(ii)4 marksComplete the table by indicating whether the following features are present, absent or sometimes present in a eukaryotic cell and a prokaryotic cell: Plasmid, Mitochondria, Nuclear envelope, Ribosome.
6. 1(c)12 marksExplain the impact of the following factors on enzyme action using the information provided in Figure 2: pH, Temperature, Enzyme concentration, Substrate concentration.
7. 2(a)(i)2 marksIn the appropriate spaces provided in Figure 3, make detailed sketches to illustrate the TWO key stages of mitosis in the cell that are NOT shown (Stage II and Stage III).
8. 2(a)(ii)3 marksState the name of the missing stages: Stage II, Stage III, Stage IV.
9. 2(a)(iii)3 marksExplain how the process of mitosis ensures that each daughter nucleus receives a full set of chromosomes.
10. 2(b)(i)2 marksDefine the term 'natural selection'.
11. 2(b)(ii)3 marksList THREE of Darwin's observations concerning natural selection.
12. 2(c)(i)5 marksOn the grid provided on page 15, plot a line graph to represent the data in Table 1 for Pond A, Pond B and Pond C.
13. 2(c)(ii)6 marksUsing the information given on page 14, discuss how the results of John Endler's experiment, as it relates to variation in the number of spots in male guppies, may support THREE of Darwin's deductions regarding natural…
14. 3(a)(i)2 marksState a suitable hypothesis for this experiment.
15. 3(a)(ii)1 markState ONE possible source of error in the experiment.
16. 3(a)(iii)1 markState ONE change in the experiment that could have overcome the error stated in (a)(ii).
17. 3(a)(iv)1 markIdentify ONE responding variable in the experiment.
18. 3(b)(i)1 markState the function of the Epidermis in the anther of a stamen.
19. 3(b)(ii)1 markState the function of the Tapetum in the anther of a stamen.
20. 3(b)(iii)1 markState the function of Pollen mother cells in the anther of a stamen.
21. 3(b)(iv)3 marksStarting from the pollen mother cell, outline the steps in pollen grain formation.
22. 3(b)(v)3 marksExplain the significance of double fertilization in the embryo sac of a flower.
23. 3(c)4 marksUsing the information given in the flow chart, outline how the body controls spermatogenesis in the human male.
24. 3(d)(i)4 marksUsing the information from Figure 6, discuss the effects of maternal smoking on foetal development. You must refer to Figure 6 in your discussion.
25. 3(d)(ii)4 marksDiscuss how TWO maternal behaviours, other than smoking, may contribute to low birth weight. You must include ONE lifestyle change that the physician may recommend for EACH maternal behaviour discussed.