CAPE Biology Unit 2 · 2015 · 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)2 marksDescribe the observed effects of light intensity on the photosynthesis rate of this species in regions A and B.
2. 1(a)(ii)2 marksOutline the biological process by which O2 is produced during photosynthesis.
3. 1(b)(i)6 marksUsing an annotated diagram of a simple respirometer constructed from a plastic syringe and capillary tube, outline the procedure for measuring respiration in germinating seeds.
4. 1(b)(ii)5 marksSuggest FIVE precautions to be taken to ensure the accuracy and reliability of the results when conducting an experiment using a simple respirometer.
5. 2(a)(i)1 markOn Figure 2, use an arrow labelled X to indicate the position where a leafy shoot is placed in the potometer.
6. 2(a)(ii)3 marksOutline the key steps for determining the rate of transpiration using the potometer shown in Figure 2. Note: Setting up apparatus details are not required.
7. 2(b)4 marksWith reference to FOUR structural features, explain how xylem tissue is designed to facilitate water transport. (Do not define transpiration or explain the water transport mechanism).
8. 2(c)(i)4 marksIn the region highlighted by Box A on Figure 3, draw cellular details of the tissue layers.
9. 2(c)(ii)2 marksWith reference to the structural features in Figure 3, explain how an artery is able to withstand high blood pressure pumped from the heart.
10. 2(c)(iii)1 markState ONE major difference that would be observed if a plan drawing of a vein's cross section were examined.
11. 3(a)(i)5 marksOn the grid provided on page 9, plot a bar graph of the data in Table 1 using the x-axis for the time period.
12. 3(a)(ii)2 marksDescribe the changes in obesity levels among the age groups over time.
13. 3(a)(iii)3 marksSuggest THREE possible reasons that may account for the trends described in obesity levels over time.
14. 3(b)(i)2 marksDescribe the antibody response shown in Figure 4.
15. 3(b)(ii)1 markExplain whether the response shown in Figure 4 is likely to be a primary or secondary response to infection.
16. 3(c)2 marksDistinguish between active and passive immunity.
17. 4(a)(i)6 marksExplain why energy transfer between trophic levels is considered relatively inefficient, providing a brief definition of 'trophic level' and THREE reasons for this inefficiency.
18. 4(a)(ii)5 marksBriefly describe the THREE types of biological pyramids and comment on which type is the most useful for representing the productivity of EACH trophic level.
19. 4(b)4 marksOutline the current view of the relationship between biological diversity and ecosystem stability, and briefly discuss evidence in support of this viewpoint.
20. 5(a)5 marksExplain the mechanism for selective reabsorption of glucose from glomerular filtrate in the kidney, including the role of sodium ions (Na+), and discuss the clinical significance of glucose presence in the urine.
21. 5(b)4 marksStarting with atrial systole, describe the mammalian cardiac cycle, including cycle initiation and mechanisms preventing reverse blood flow.
22. 5(c)6 marksExplain the regulatory effects of blood carbon dioxide levels and the hormone adrenaline on heart action.
23. 6(a)(i)6 marksDefine the term 'disease' and discuss THREE different types of factors that may influence a person's health.
24. 6(a)(ii)4 marksState TWO main categories of human disease, giving a brief description of EACH category, and comment on the problem of classifying a disease into one particular category with an example.
25. 6(b)5 marksIdentify the type of addiction demonstrated by Sandra and Wayne, justify your answers using case details, and include a brief explanation of the term 'drug abuse'.