CSEC Human and Social Biology · May/June 2015 · Paper 2

35 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)2 marksState TWO functions of water other than being the medium in which body reactions occur.
2. 1(b)(i)2 marksDefine what is meant by the term 'balanced diet'.
3. 1(b)(ii)2 marksName TWO nutrients that must be present in a balanced diet to provide energy for physical activities.
4. 1(c)(i)1 markTest Tube 1 changes colour from blue to orange-red upon heating. Name the nutrient most likely present in the sample.
5. 1(c)(ii)3 marksState whether there would be a colour change in Test Tube 2, and give a reason for your answer.
6. 1(d)(i)2 marksUsing Table 1, identify which group had the MOST balanced diet and give a reason for your answer.
7. 1(d)(ii)2 marksUsing Table 1, identify which group of students would be MOST prone to becoming obese and give a reason for your answer.
8. 1(d)(iii)1 markApart from diet and physical exercise, suggest ONE factor that can contribute to obesity.
9. 2(a)(i)2 marksIdentify the parts labelled A and B on Figure 1.
10. 2(a)(ii)1 markState ONE advantage of long bones being hollow instead of solid.
11. 2(b)3 marksName TWO raw materials required for photosynthesis and ONE product of photosynthesis.
12. 2(c)4 marksState the expected results of testing the variegated leaf with iodine and explain your answer.
13. 2(d)(i)2 marksIdentify the group of organisms possessing the greatest biomass in the food web and state the role they perform.
14. 2(d)(ii)2 marksExplain why each successive trophic level contains less energy than the one before it.
15. 2(d)(iii)1 markSuggest ONE consequence on the food web if parrots were removed.
16. 3(a)(i)1 markIdentify the largest source of air pollutants in the world today.
17. 3(a)(ii)2 marksName TWO greenhouse gases that contribute to global warming.
18. 3(b)2 marksState the main biological function of breathing in humans.
19. 3(c)(i)1 markState what is meant by the term 'vital capacity'.
20. 3(c)(ii)4 marksExplain how exercise and smoking respectively affect an individual's vital capacity.
21. 3(c)(iii)3 marksExplain whether training at higher altitude would improve an athlete's running performance.
22. 3(c)(iv)2 marksState whether training in a city with polluted air would adversely affect performance and give a reason.
23. 4(a)2 marksComplete the sentences by selecting the correct terms from the list provided (blood pressure, systole, ventricles, atria, diastole) to describe chamber contraction and relaxation.
24. 4(b)(i)2 marksName the medical condition characterized by the hardening of arterial walls due to plaque build-up, and state ONE symptom.
25. 4(b)(ii)2 marksState TWO risk factors that contribute to the development of hypertension.
26. 4(c)4 marksBriefly describe the physiological effects that clogged arteries supplying the brain would have on the brain and the individual.
27. 4(d)(i)3 marksUsing Figure 3, identify which individual is most likely suffering from diabetes mellitus and explain your choice.
28. 4(d)(ii)2 marksExplain ONE way in which genetic engineering has aided in the medical management and treatment of diabetes mellitus.
29. 5(a)(i)3 marksName the cell division process by which gametes are produced and state its importance to fertilization.
30. 5(a)(ii)3 marksName TWO mechanisms by which genetic variation arises in humans and state ONE advantage of genetic variation.
31. 5(b)(i)3 marksSuggest THREE advantages of family planning to the young couple.
32. 5(b)(ii)6 marksDiscuss THREE benefits that widespread family planning provides to a country as a whole.
33. 6(a)6 marksLabel stages A and B and write down the approximate duration of the developmental processes I, II, III, and IV on Figure 4.
34. 6(b)4 marksSuggest THREE signs or symptoms of gastroenteritis and identify a causative agent for the condition.
35. 6(c)5 marksSuggest ONE other infectious disease besides typhoid that can cause gastroenteritis, and explain TWO prevention measures.