CSEC Integrated Science · 2005 · Paper 2

54 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)1 markState which model, A or B, better represents the human respiratory system.
2. 1(a)(ii)2 marksProvide one reason for your answer in (a)(i).
3. 1(a)(iii)a)1 markState which part of the human respiratory system is represented by the balloons in Model B.
4. 1(a)(iii)b)1 markState which part of the human respiratory system is represented by the rubber in Model B.
5. 1(a)(iv)2 marksExplain whether the volume of air inside the bell jar changes when the thumb in Model B is removed and the rubber flattens.
6. 1(a)(v)3 marksIdentify whether inhalation or exhalation is demonstrated by the bell jar model in Figure 1, giving one reason for your answer.
7. 1(b)(i)1 markDetermine the percentage of the population at location A with severe bronchitis using Figure 2.
8. 1(b)(ii)1 markIdentify which location (A, B, C, or D) is least affected by severe bronchitis.
9. 1(b)(iii)1 markSuggest which location (A, B, C, or D) is most likely situated near a large cement factory.
10. 1(b)(iv)2 marksGive two reasons supporting your suggestion in (b)(iii).
11. 2(a)(i)1 markState which feature of the strings must be kept constant or controlled during these tests.
12. 2(a)(ii)1 markState what the investigator should do after removing each load before adding another during the tests.
13. 2(a)(iii)2 marksProvide two reasons explaining the shape of the graph lines shown in Figure 3.
14. 2(a)(iv)3 marksExplain which string (P, Q, or R) can support the largest load while still remaining elastic.
15. 2(a)(v)a)2 marksState which string was chosen for professional tournament rackets and provide one reason for the selection.
16. 2(a)(v)b)2 marksState which string was chosen for school children's rackets and provide one reason for the selection.
17. 2(b)(i)2 marksState two properties of aluminium that make it suitable for batsman protective headgear coated with fabric.
18. 2(b)(ii)1 markSuggest one environmental condition or factor that encourages mildew growth.
19. 2(b)(iii)1 markExplain how the batsman could have stored or treated his protective gear to prevent mildew growth.
20. 3(a)2 marksRead each meter display and calculate the total amount of electricity consumed during December 2002 in kWh.
21. 3(b)2 marksCalculate the total cost of electricity used in December, given a fixed fuel charge of $20.00 and an energy rate of 25 cents per kWh.
22. 3(c)(i)2 marksCalculate the total daily energy consumption in kWh per day for all the appliances listed in Table 1.
23. 3(c)(ii)2 marksState two measures the household can implement to reduce their electricity usage.
24. 3(d)(i)1 markDefine what a fuse is.
25. 3(d)(ii)2 marksExplain how a fuse provides protection for an electrical appliance such as a hairdryer.
26. 3(d)(iii)2 marksExplain why water must not be used to extinguish an electrical fire.
27. 3(d)(iv)2 marksState two safe methods used to extinguish an electrical fire.
28. 4(a)(i)1 markExplain why all drinking water from this contaminated supply should be boiled before drinking.
29. 4(a)(ii)2 marksState whether it is necessary to boil water intended for making ice, providing one reason for your answer.
30. 4(a)(iii)1 markState one route by which treated water from a plant can become contaminated before reaching a household tap.
31. 4(a)(iv)1 markIdentify one water-borne disease humans can contract by drinking contaminated water.
32. 4(b)(i)a)1 markExplain why a sterile swab was used in step one.
33. 4(b)(i)b)1 markExplain why bacteria were collected specifically from the mouth.
34. 4(b)(i)c)1 markExplain why the third agar plate was not treated with any mouthwash.
35. 4(b)(i)d)2 marksExplain why the culture plates were incubated at 37 °C.
36. 4(b)(ii)1 markIdentify which agar plate exhibited the highest amount of bacterial growth based on Figure 7.
37. 4(b)(iii)1 markSuggest what caused the high bacterial growth rate observed in the plate identified in (b)(ii).
38. 4(b)(iv)2 marksState which brand of mouthwash is more effective, giving one reason from the results.
39. 4(b)(v)1 markState which mouthwash label in Figure 6 makes the more accurate claim based on the experimental results.
40. 5(a)3 marksLabel structures (i), (ii), and (iii) indicated on the kidney diagram in Figure 8.
41. 5(b)(i)a)1 markState whether the amount of urea passing point D in Figure 9 increases or decreases following a high-protein meal.
42. 5(b)(i)b)2 marksExplain your reasoning for the answer given in (b)(i) a).
43. 5(b)(ii)2 marksSuggest one possible medical or physiological reason why glucose might be detected at point D in Figure 9.
44. 5(b)(iii)1 markExplain why glucose detected at point D will consequently be found in the bladder.
45. 5(b)(iv)3 marksExplain the effect that losing glucose in urine would have on Peter's capacity to perform daily tasks.
46. 5(b)(v)2 marksExplain why Peter consumes a drink containing glucose and water after jogging around the field.
47. 5(b)(vi)1 markName the hormone that acts to reduce blood glucose concentration.
48. 6(a)(i)1 markDefine what is meant by a 'front'.
49. 6(a)(ii)4 marksComplete Table 3 by matching each front type (occluded, stationary, warm, cold) to its correct description.
50. 6(a)(iii)4 marksPredict the weather conditions in the Caribbean (under a cold front) and in the U.S.A. (under a warm front).
51. 6(b)2 marksExplain the difference between high tide and low tide.
52. 6(c)(i)2 marksExplain why shelled organisms are predominantly found in areas A and B of the seashore.
53. 6(c)(ii)1 markExplain why organisms inhabiting region B require adaptations to firmly cling to rocks.
54. 6(c)(iii)1 markName one organism other than a snail commonly found in region B of the rocky shore.