CSEC Biology · January 2013 · Paper 2

46 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 marksOn the grid provided below, draw a graph to represent the data in Table 1.
2. 1(a)(ii)2 marksDescribe the shape of the graph between Months 1 and 3 and between Months 4 and 6.
3. 1(a)(iii)2 marksTaking into account the concentration of oxygen at higher altitudes, give an explanation for the change in the red blood cell count at higher altitudes.
4. 1(a)(iv)2 marksSuggest a suitable hypothesis for the results shown in Table 1.
5. 1(a)(v)2 marksWhat would be a suitable control in an experiment being conducted to test the hypothesis suggested in (iv) above?
6. 1(b)(i)2 marksHow do the red blood cells of Katz differ from normal red blood cells?
7. 1(b)(ii)2 marksExplain why sickle-cell anaemia makes Katz feel tired easily.
8. 1(c)(i)1 markSuggest ONE condition under which the number of white blood cells in the human body will be increased.
9. 1(c)(ii)2 marksState the function of TWO different types of white blood cells.
10. 1(c)(iii)1 markSuggest why red blood cells have a shorter life span than that of white blood cells.
11. 1(d)(i)2 marksDescribe TWO ways by which plants protect themselves from excess water loss.
12. 1(d)(ii)1 markState the name used to describe the mode of nutrition in plants.
13. 1(d)(iii)1 markName the organelle found in the cells of green plants that is responsible for the type of nutrition stated in (ii) above.
14. 2(a)(i)1 markName the part of the plant in Figure 1 that is responsible for Support of the stem.
15. 2(a)(ii)1 markName the part of the plant in Figure 1 that is responsible for Sexual reproduction.
16. 2(a)(iii)1 markName the part of the plant in Figure 1 that is responsible for Development of the embryo.
17. 2(a)(iv)1 markName the part of the plant in Figure 1 that is responsible for Obtaining water and mineral salts.
18. 2(a)(v)1 markName the part of the plant in Figure 1 that is responsible for Making food for the plant.
19. 2(b)(i)2 marksState the method of fruit dispersal for the plant in Figure 1, and give ONE reason to support your answer.
20. 2(b)(ii)2 marksExplain why plants produced from the seeds of the tomato plant are NOT identical to the parent plant.
21. 2(c)(i)2 marksSuggest TWO advantages that may be gained by propagating this plant asexually, for example, by tissue culture.
22. 2(c)(ii)2 marksSuggest TWO characteristics that a farmer may want to keep in his crop of tomato plants.
23. 2(d)2 marksOutline ONE concern that has been raised about the consumption of genetically modified foods.
24. 3(a)(i)1 markUse a label line in Figure 2 to illustrate the position of the Adrenals endocrine gland.
25. 3(a)(ii)1 markUse a label line in Figure 2 to illustrate the position of the Thyroid gland endocrine gland.
26. 3(a)(iii)1 markUse a label line in Figure 2 to illustrate the position of The pituitary gland endocrine gland.
27. 3(b)(i)4 marksName TWO hormones produced by the pituitary gland and state the role of EACH.
28. 3(b)(ii)2 marksSuggest TWO effects of a poorly developed pituitary gland in humans.
29. 3(c)(i)a)1 markFigure 3A shows a shoot growing in sunlight. Complete Figure 3B to show the response of the shoot to light coming from only one direction.
30. 3(c)(i)b)1 markComplete Figure 3B to show the distribution of the hormone responsible for the response shown in your drawing in B.
31. 3(c)(ii)2 marksExplain how the hormone causes the response shown in Figure 3B.
32. 3(c)(iii)2 marksSuggest why this response to light is important to the survival of the plant.
33. 4(a)(i)2 marksName the structures responsible for gaseous exchange in humans and in fish.
34. 4(a)(ii)3 marksIdentify THREE features that the structures named in (i) above have in common.
35. 4(b)(i)3 marksDraw and annotate a diagram to show how oxygen and carbon dioxide are exchanged across the respiratory surface of a human.
36. 4(b)(ii)a)1 markName the process by which gases are exchanged in plants.
37. 4(b)(ii)b)3 marksExplain why in plants there is a difference in the percentage of the respiratory gases exchanged during the day compared with the percentage exchanged during the night.
38. 4(c)3 marksExplain the effect of cutting and burning forests on the operation of the carbon cycle, and on the environment.
39. 5(a)(i)6 marksWith the aid of a diagram, describe how a nerve cell is adapted to carry out its function.
40. 5(a)(ii)2 marksSuggest how loss of nerve cells from the brain may lead to loss of memory.
41. 5(b)7 marksDiscuss the abuse of alcohol in humans. In your answer, identify THREE effects caused by the action of alcohol on the brain, and suggest TWO social and TWO economic consequences of alcohol abuse on society.
42. 6(a)(i)6 marksDistinguish between artificial immunity and natural immunity. In your answer, explain how artificial immunity and natural immunity protect the human body against infectious diseases.
43. 6(a)(ii)2 marksSuggest TWO disadvantages of immunization.
44. 6(a)(iii)2 marksThe H1N1 virus is spread through the air. Suggest TWO precautions, other than immunization, that an individual can take to avoid getting the disease.
45. 6(b)(i)2 marksName a pathogenic disease that is spread in a manner different from the H1N1 virus and suggest ONE measure that may be taken to control the spread of this disease.
46. 6(b)(ii)3 marksHow are the methods used in the control of the spread of viruses among crop plants similar to those used to control the spread of viruses among farm animals?