CAPE Biology Unit 2 · 2009 · Paper 2

27 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)6 marksExplain how the apparatus shown in Figure 1 is used to investigate the rate of oxygen uptake of the germinating peas in the respirometer.
2. 1(b)1 markState ONE way in which the apparatus in Figure 1 could be modified to determine the effect of temperature on oxygen uptake by germinating peas.
3. 1(c)(i)5 marksOn Figure 2, label EACH of the stages with C to indicate decarboxylation reactions and H to indicate dehydrogenation reactions.
4. 1(c)(ii)1 markState EXACTLY where the Krebs cycle occurs in a cell.
5. 1(c)(iii)2 marksBriefly explain the role of NAD in the Krebs cycle, in relation to energy production.
6. 2(a)4 marksState FOUR structural features of xylem vessels.
7. 2(b)3 marksUsing THREE of the features listed in (a), explain how EACH feature facilitates the conduction of water and mineral salts in plants.
8. 2(c)(i)2 marksIdentify the tissues labelled A, B, C and D on Figure 3.
9. 2(c)(ii)5 marksIn the box provided, draw a plan diagram to show the distribution of the major tissues of the artery wall in Box A of Figure 3 at twice the size.
10. 2(c)(iii)1 markGiven that Figure 3 has been magnified 100 times, calculate the ACTUAL width of the artery wall in the region of Box A.
11. 3(a)(i)3 marksComplete the bar chart shown in Figure 4 to show the data collected on female users.
12. 3(a)(ii)3 marksState THREE significant trends in relation to the use of psychoactive substances demonstrated by the data.
13. 3(b)(i)4 marksExplain how consistent use of alcohol affects the liver, including TWO points.
14. 3(b)(ii)1 markState ONE way consistent use of alcohol during pregnancy can adversely affect the foetus.
15. 3(c)4 marksSuggest, with an explanation, TWO other kinds of data that could be collected and used to determine whether the use of these substances constitutes a health or social risk.
16. 4(a)4 marksDistinguish between the terms 'ecosystem' and 'ecological niche'.
17. 4(b)4 marksExplain why energy is said to flow through, and not cycle, as it is transferred within an ecosystem.
18. 4(c)(i)3 marksUsing examples, explain the difference between the terms 'in situ' and 'ex situ' as they relate to biological conservation.
19. 4(c)(ii)4 marksDiscuss TWO challenges associated with the use of zoological parks for the maintenance of biodiversity of large mammals.
20. 5(a)(i)5 marksExplain how hormones contribute to the maintenance of a fairly constant internal environment in animals despite external environmental changes.
21. 5(a)(ii)2 marksSuggest TWO other ways in which ethene plays a regulatory role in plants besides speeding up the ripening of fruits.
22. 5(b)(i)2 marksDistinguish between 'ultra-filtration' and 'selective re-absorption' in relation to urine formation.
23. 5(b)(ii)6 marksWith reference to THREE structural features, discuss how the proximal convoluted tubule is ideally suited to the function of selective re-absorption.
24. 6(a)(i)3 marksState THREE key features of diabetes.
25. 6(a)(ii)4 marksSuggest TWO factors which are thought to be responsible for the increase in diabetes in the Caribbean.
26. 6(b)4 marksDistinguish between 'natural' and 'artificial immunity'.
27. 6(c)4 marksDefine the term 'monoclonal antibodies' and state THREE benefits of the use of monoclonal antibodies in the diagnosis of diseases.