CAPE Biology Unit 2 · 2014 · Paper 2

23 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)4 marksIdentify the structures labelled A, B, C and D in Figure 1.
2. 1(a)(ii)1 markUsing an arrow labelled X on Figure 1, indicate the site of the Krebs cycle.
3. 1(b)(i)3 marksDescribe the relationship between leaf temperature and net photosynthetic rate at 1935 ppm CO2.
4. 1(b)(ii)3 marksWith reference to data presented in Figure 2, explain the effect of the increase in CO2 concentration on the rate of photosynthesis, taking into consideration the temperature of the leaf.
5. 1(b)(iii)4 marksBriefly comment on how an understanding of temperature and carbon dioxide, as limiting factors of photosynthesis, may be used by farmers to increase crop yield in greenhouses.
6. 2(a)4 marksState the effect of potassium cyanide on potassium uptake at EACH temperature (0 °C and 25 °C), and give a brief explanation.
7. 2(b)6 marksUsing a labelled diagram of a transverse section of a root (including a root hair), illustrate THREE pathways by which water moves from soil into root cells. Limit the illustration to a small section of the epidermis…
8. 2(c)(i)3 marksIdentify the structures labelled A, B, and C in Figure 4.
9. 2(c)(ii)2 marksExplain how arterial pressure is affected if the structure labelled D is defective.
10. 3(a)(i)5 marksOn the grid provided, draw line graphs of the data in Table 1 for Africa and Asia.
11. 3(a)(ii)2 marksCompare the trend in percentage of overweight and obesity for Africa with that of Latin America and the Caribbean, over the period 1990-2010.
12. 3(a)(iii)2 marksSuggest TWO key strategies which may be effective in reducing or preventing obesity in pre-school children.
13. 3(b)(i)3 marksOn Figure 5, use annotations to describe the steps labelled 1, 2 and 3.
14. 3(b)(ii)3 marksOutline how a macrophage may act as an antigen-presenting cell.
15. 4(a)4 marksGive an analysis of potential energy losses across trophic levels in a food chain.
16. 4(b)4 marksComment on the importance of food web complexity in an ecosystem. In your answer, explain what is meant by a food web.
17. 4(c)7 marksDescribe SIX biotic interactions that can occur in an ecosystem. Include a brief explanation of the term 'biotic interaction'.
18. 5(a)(i)2 marksGive a concise explanation of the term 'translocation' in plants.
19. 5(a)(ii)4 marksApple growers in Japan sometimes make a non-lethal spiral slash around the bark of trees destined for removal after the growing season. This practice makes the apples sweeter. With reference to the mass flow principle,…
20. 5(b)(i)6 marksMammalian neurones in a resting state normally have a membrane potential of approximately -70 millivolts. If the plasma membrane is depolarized an action potential is generated. Outline the main steps in the…
21. 5(b)(ii)3 marksA common practice in dentistry is the use of local anesthetic injections of Lidocaine to numb a target area. Lidocaine is known to bind to receptor sites of sodium channels. Suggest, giving a brief explanation, what…
22. 6(a)7 marksExplain the association between excessive dietary fat intake and hypertension. Include in your account a brief explanation of the term 'hypertension', and a concise description of plaque formation in arteries.
23. 6(b)8 marksDistinguish between chronic bronchitis and emphysema, and explain how these chronic obstructive respiratory diseases can develop due to cigarette smoking.