CAPE Biology Unit 2 · 2008 (Rest of Region) · Paper 2

29 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 respirometer apparatus is used to measure the rate of oxygen uptake by organisms.
2. 1(b)(i)1 markSuggest a control for this experiment.
3. 1(b)(ii)4 marksPlot the results for the germinating peas at 25 °C on the graph grid provided.
4. 1(b)(iii)2 marksCalculate the rate of oxygen consumption for germinating peas at BOTH temperatures (10 °C and 25 °C) using the time interval between 10 and 20 minutes.
5. 1(b)(iv)a)1 markComment on the differences in oxygen consumption observed between germinating peas at 10 °C and 25 °C.
6. 1(b)(iv)b)1 markComment on the differences in oxygen consumption observed between germinating and dry peas.
7. 2(a)(i)2 marksComplete the table of xylem diameters for Juniper and Quercus and calculate the diameter of the trunk xylem as a percentage of the deep root xylem for both species.
8. 2(a)(ii)2 marksAccount for the difference in diameter of the xylem between the trunk of the tree and the shallow roots.
9. 2(a)(iii)2 marksState TWO factors, other than transpiration pull from the leaves, that would account for water movement in the xylem of the roots.
10. 2(b)(i)1 markIdentify the THREE main tissue types labelled 1, 2, and 3 shown in Figure 3.
11. 2(b)(ii)3 marksFour cells are marked with an 'X'. Draw these four cells and all cells between them in correct proportion at a magnification of x2.
12. 2(b)(iii)1 markThe cell labelled V has been magnified 300 times. Calculate the actual diameter of this cell.
13. 2(c)(i)1 markIdentify the structures labelled X, Y, and Z in Figure 4.
14. 2(c)(ii)3 marksState how EACH of the structures X, Y, and Z is adapted to its function.
15. 3(a)6 marksConstruct two 'best fit' lines to display the data on the grid on page 11, using the same pair of axes and including a key.
16. 3(b)3 marksDescribe the relationship between the number of fast food outlets (in thousands) and the prevalence of obesity (in millions) with reference to the 1985–2005 data.
17. 3(c)3 marksProject the graph lines for fast food outlets and obesity to the year 2015 using a sketched line, and state the projected relationship between them in 2015 using data to support your answer.
18. 3(d)3 marksState and explain THREE factors other than fast food outlets that could cause obesity in society.
19. 4(a)4 marksDescribe the structure of thylakoids and explain clearly how they are adapted to their function.
20. 4(b)4 marksClarify the pathway and productivity of a ground electron from its entry into Photosystem I to its incorporation into a reduced phosphate-containing product.
21. 4(c)4 marksExplain the term 'ecological pyramid' and distinguish between the THREE major types of ecological pyramids.
22. 4(d)3 marksDiscuss how energy flows through an ecosystem.
23. 5(a)4 marksDescribe the ways in which red blood cells and haemoglobin molecules are effective in maximising the uptake of oxygen.
24. 5(b)4 marksExplain the Bohr Effect and its implications for the stability of oxyhaemoglobin in active muscle tissue.
25. 5(c)7 marksDiscuss the hormonal processes involved in maintaining a constant blood glucose concentration around 90 mg per 100 cm³ and rarely exceeding 150 mg per 100 cm³ after a meal.
26. 6(a)4 marksProvide an annotated diagram of an antibody molecule relating its most important structural features to its functions.
27. 6(b)4 marksDistinguish between and describe the modes of action of mature B and T cells in humoral and cell-mediated immune responses.
28. 6(c)4 marksDistinguish between physical and psychological drug dependence.
29. 6(d)3 marksDiscuss the long-term consequences of alcohol consumption on the liver.