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CSEC Human and Social Biology · May/June 2014 · Paper 2

41 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.

Practise this paper
  1. 1(a)2 marksSuggest TWO other ways by which HIV is transmitted, apart from unprotected sex with an infected person.
  2. 1(b)(i)1 markName the cell that is specifically targeted and destroyed by the human immunodeficiency virus.
  3. 1(b)(ii)2 marksState TWO signs or symptoms of AIDS.
  4. 1(c)1 markBoth gonorrhoea and syphilis are transmitted via unprotected sex with an infected person. Why are these diseases referred to as venereal and AIDS is NOT referred to as venereal?
  5. 1(d)(i)3 marksOn the grid provided in Figure 1, construct a bar graph of the number of deaths due to AIDS, using the data in Table 1.
  6. 1(d)(ii)1 markWhich country has the HIGHEST number of persons living with HIV/AIDS according to Table 1?
  7. 1(d)(iii)1 markWhich country has the LOWEST number of deaths due to AIDS according to Table 1?
  8. 1(d)(iv)2 marksThe Bahamas and Cuba have almost similar numbers of persons living with HIV/AIDS. However, Cuba has 15 deaths while The Bahamas has 50 deaths due to AIDS. Suggest ONE reason why Cuba has LESS deaths than The Bahamas.
  9. 1(e)2 marksThe economy of some countries depends heavily on tourism. Suggest ONE effect that a high incidence of AIDS would have on these countries.
  10. 2(a)(i)2 marksName the organelles labelled A and B in Figure 2.
  11. 2(a)(ii)2 marksState ONE function of EACH of the organelles labelled C and D in Figure 2.
  12. 2(b)(i)1 markIdentify ONE feature that is common to both a virus and a typical plant cell when viewed under a microscope.
  13. 2(b)(ii)2 marksSuggest TWO differences that would be observed between the virus and the typical plant cell under a microscope.
  14. 2(c)(i)1 markName the cell labelled Y in Figure 3.
  15. 2(c)(ii)1 markAre the cells in Figure 3 classified as differentiated or undifferentiated?
  16. 2(d)3 marksChildren in a pre-school breathe deeply while running around in a park. They laugh a lot even when they are hurt, and they run to mummy for a snack. Name THREE characteristics of living organisms that these children…
  17. 2(e)3 marksBernadette tells Georgiana that a flame is a living organism because it moves, grows and reproduces by sparks. Is Bernadette correct? Explain your answer.
  18. 3(a)4 marksName the structures labelled A and B in Figure 4, and state ONE function of EACH structure.
  19. 3(b)(i)1 markA pancreas becomes diseased and stops producing pancreatic juice. Name ONE food group whose digestion would be affected.
  20. 3(b)(ii)1 markState ONE effect that a deficiency of the food group named in (b)(i) would have on the human body.
  21. 3(c)(i)1 markIn which of the three test tubes in Figure 5 would the starch be digested?
  22. 3(c)(ii)4 marksExplain why starch would NOT be digested in the other two test tubes in Figure 5.
  23. 3(d)(i)3 marksExplain why Veera’s way of briefly chewing her food is bad for the digestion of the food.
  24. 3(d)(ii)1 markIn which region of the digestive system would the final stage of the digestion of starches occur?
  25. 4(a)2 marksComplete the sentences: Meiosis is a type of cell division in which the chromosome number is [blank]. At the end of meiosis in humans, each daughter cell contains [blank] chromosomes.
  26. 4(b)(i)1 markName the type of cell in which meiosis occurs.
  27. 4(b)(ii)2 marksState TWO differences between mitosis and meiosis.
  28. 4(c)1 markName a genetic disease that results if the zygote receives an extra chromosome.
  29. 4(d)(i)1 markDuring which period does menstruation occur according to Figure 6?
  30. 4(d)(ii)2 marksWhat occurs within the ovary as the wall of the uterus starts to thicken, and during which days of the cycle does this occur?
  31. 4(d)(iii)4 marksBetween days 14 and 28, what is the pattern seen with the ovarian hormonal levels if pregnancy does NOT occur?
  32. 4(d)(iv)a)1 markWhich pituitary hormone controls ovulation?
  33. 4(d)(iv)b)1 markOn which day does ovulation occur?
  34. 5(a)(i)3 marksName the mosquito that causes dengue and state TWO symptoms of dengue.
  35. 5(a)(ii)3 marksExplain how a mosquito spreads dengue.
  36. 5(b)(i)3 marksThe garbage collectors where Devon lives have been on strike for three weeks and the neighbours are now experiencing vomiting and diarrhoea. Explain why these signs of diseases (vomiting and diarrhoea) have spread…
  37. 5(b)(ii)6 marksSuggest THREE measures that Devon’s community could take to prevent the spread of diseases such as gastroenteritis and leptospirosis. Provide reasons for your suggestions.
  38. 6(a)(i)3 marksDefine the term 'pollution' and give ONE example of a water pollutant.
  39. 6(a)(ii)3 marksDescribe the process of eutrophication.
  40. 6(b)(i)5 marksHeavy rains cause flooding in farmland areas in a Caribbean country. Explain why members of your community become ill after eating vegetables from the flooded areas, and suggest TWO measures that they should take to…
  41. 6(b)(ii)4 marksYour class is required to test the flood water for bacteria. Describe the test for bacteria, and suggest TWO methods that could be used to sterilize the flood water.

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