CSEC Human and Social Biology · May/June 2012 · Paper 2

38 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)3 marksIdentify the structures labelled W, X and Y in Figure 1.
2. 1(b)3 marksIdentify ONE feature of the location of the alveoli and TWO features of their structure that allow them to carry out their function efficiently.
3. 1(c)(i)1 markState the year in which the total number of smokers was the HIGHEST.
4. 1(c)(ii)1 markState the period in which there was the GREATEST increase in the total number of smokers.
5. 1(c)(iii)2 marksCompare the pattern of smoking in men to that of women between 1990 and 2010.
6. 1(c)(iv)2 marksCompare the pattern of lung cancer in females to that of smoking for females.
7. 1(c)(v)1 markSuggest ONE reason for the change in the pattern of smoking observed in men between 2000 and 2010.
8. 1(c)(vi)2 marksSuggest TWO reasons for the pattern of smoking observed in females.
9. 2(a)(i)2 marksConstruct an aquatic food chain using three organisms found on reefs.
10. 2(a)(ii)1 markIdentify a herbivore from the constructed food chain in (a)(i).
11. 2(a)(iii)1 markState which trophic level of a food chain (first, second or third) has the HIGHEST number of species.
12. 2(a)(iv)4 marksAccount for the differences in available energy at the different trophic levels of the food chain.
13. 2(b)2 marksFill in the blanks to complete the statements distinguishing an organism that lives in or on another host from one that feeds by capturing and killing prey.
14. 2(c)5 marksProvide the equation for photosynthesis, and using the information in Figure 4, explain why getting rid of all trees, plants, and grass everywhere is not a good idea.
15. 3(a)2 marksName the TWO subdivisions of the nervous system.
16. 3(b)(i)2 marksState the names of the parts labelled X and Y in Figure 5.
17. 3(b)(ii)2 marksState ONE function of EACH of the parts labelled X and Y.
18. 3(c)(i)1 markSuggest the part of the brain that may be responsible for the intermittent fever.
19. 3(c)(ii)1 markSuggest the part of the brain that may be responsible for the irregular heartbeat and breathing.
20. 3(d)(i)2 marksExplain the difference between voluntary and involuntary actions.
21. 3(d)(ii)2 marksGive ONE example of a voluntary action and ONE example of an involuntary action other than blinking.
22. 3(e)(i)1 markState the term used for the chemicals released from vesicles at a synapse.
23. 3(e)(ii)2 marksExplain the role of the chemicals released at a synapse.
24. 4(a)2 marksDefine what is meant by the term 'genetic engineering'.
25. 4(b)5 marksExplain how biotechnology involving recombinant DNA is used to assist persons with diabetes, stating the name of ONE product and outlining how it is made.
26. 4(c)2 marksState ONE advantage and ONE disadvantage associated with the use of genetic engineering in food production.
27. 4(d)(i)1 markComplete the sentence describing the condition of atherosclerosis.
28. 4(d)(ii)2 marksDescribe TWO effects that hypertension could have on the cardiovascular system.
29. 4(d)(iii)3 marksSuggest THREE changes Sunil could make to his lifestyle to control his hypertension.
30. 5(a)4 marksState the hormones produced by endocrine glands A and B, and give ONE function of EACH hormone stated.
31. 5(b)(i)2 marksName TWO hormones produced by the pituitary gland that affect both the testes and the ovaries.
32. 5(b)(ii)4 marksExplain how an underproduction of the hormones named in (b)(i) affects the human body.
33. 5(b)(iii)2 marksSuggest what may have been the effect of an underproduction of these hormones on the Ukraine population.
34. 5(c)3 marksOutline THREE differences between the nervous system and the endocrine system in controlling bodily activities.
35. 6(a)(i)3 marksName the vector responsible for the spread of dengue fever, and state TWO signs or symptoms of the disease.
36. 6(a)(ii)3 marksState TWO measures taken by health authorities, and ONE measure taken by households, to control the spread of dengue fever.
37. 6(b)3 marksExplain in detail how a visit from one infected person can lead to a fresh outbreak of malaria in a territory where it has been eradicated.
38. 6(c)6 marksExplain how knowledge of passive and active immunity may be used to protect an individual from contracting malaria, comparing the advantages and disadvantages of both approaches.