CSEC Integrated Science · May/June 2016 · 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)1 markState ONE asexual method of reproduction in plants.
2. 1(a)(ii)1 markName ONE male part of the flower.
3. 1(a)(iii)1 markName ONE female part of the flower.
4. 1(a)(iv)2 marksState TWO advantages of asexual reproduction.
5. 1(a)(v)1 markSuggest ONE reason why it is important for bees to visit the orchard flowers, given advice not to use harmful pesticides.
6. 1(b)(i)2 marksExplain scientifically how scents from orchard flowers travel to the house to cause nausea during pregnancy.
7. 1(b)(ii)3 marksState TWO advantages of surgical contraception and ONE disadvantage compared with other methods.
8. 1(b)(iii)3 marksExplain the biological significance of (1) the growth and thickening of the uterine lining, and (2) menstruation when not pregnant.
9. 1(c)(i)4 marksPlot the data from Table 1 on the grid provided in Figure 1.
10. 1(c)(ii)2 marksDraw the best straight line to show the trend on Figure 1, extending it to cut the x-axis.
11. 1(c)(iii)2 marksLabel the axes on the graph.
12. 1(c)(iv)1 markState an appropriate title for the graph.
13. 1(c)(v)1 markUsing the graph, determine the average height of the corn on the 11th day.
14. 1(c)(vi)1 markDetermine how long after planting the corn plants emerged from the soil.
15. 2(a)(i)3 marksIdentify the water cycle processes labelled I, II and III in Figure 2.
16. 2(a)(ii)1 markName the physical state of water at IV.
17. 2(b)3 marksSuggest ONE way the owner could prevent potted plants from wilting at midday during sunny periods, giving a reason for your answer.
18. 2(c)(i)2 marksState TWO reasons for adding chlorine to swimming pool water.
19. 2(c)(ii)2 marksSuggest TWO ways the facility owner can reuse the water when emptying the pool.
20. 2(c)(iii)1 markState ONE safety precaution to take when chlorinating the pool.
21. 2(d)(i)2 marksIn the box provided, draw a food chain showing the feeding relationships among these organisms.
22. 2(d)(ii)1 markName the original source of energy for this food chain.
23. 3(a)3 marksSuggest THREE habits, other than brushing regularly, that could explain why Cindy has fewer cavities than her twin Joan.
24. 3(b)(i)1 markName a substance that can be used to measure the pH of toothpaste.
25. 3(b)(ii)2 marksArrange the four toothpaste brands in descending order of acidity (most acidic first) using their letters.
26. 3(b)(iii)2 marksIdentify the toothpaste brand with an incorrect pH in Table 2 and give a reason.
27. 3(b)(iv)1 markState a possible source of error that may have caused Frank to obtain the incorrect result.
28. 3(b)(v)1 markState ONE component in toothpaste that helps strengthen teeth.
29. 3(c)(i)2 marksName ONE acidic and ONE alkaline substance present in the human digestive system.
30. 3(c)(ii)1 markName ONE digestive enzyme that operates best in an alkaline medium.
31. 3(c)(iii)2 marksExplain the scientific principle by which antacids relieve digestive problems.
32. 4(a)(i)2 marksState ONE advantage and ONE disadvantage of using solar-powered vehicles.
33. 4(a)(ii)2 marksSuggest TWO energy conversions that take place in a moving solar-powered car.
34. 4(b)(i)4 marksIdentify the manipulated variable, the responding variable, and two controlled variables in this experiment.
35. 4(b)(ii)1 markState the formula used to calculate the energy converted (work done) when cars move.
36. 4(b)(iii)2 marksCalculate the energy conversion of the car on the smooth surface and on the rough surface.
37. 4(c)(i)1 markState what is meant by the term 'inefficiencies of machines'.
38. 4(c)(ii)2 marksUse your calculations in (b)(iii) to deduce which surface made the toy car more efficient, giving a reason.
39. 4(c)(iii)1 markState ONE factor, other than friction, that contributes to the inefficiency of machines.
40. 5(a)5 marksName TWO structures of the human respiratory system and THREE structures of the circulatory system.
41. 5(b)6 marksExplain THREE physiological effects of long-term cigarette smoking (20 years) on the respiratory system.
42. 5(c)4 marksDiscuss TWO garage design modifications that could reduce the build-up of air pollution.
43. 6(a)2 marksState the function of an electrical fuse and give ONE reason why aluminium foil should never be used as a replacement.
44. 6(b)4 marksCalculate the electrical power of the tire pump, stating the correct unit.
45. 6(c)2 marksName TWO materials suitable for making electrical conducting wires.
46. 6(d)7 marksWith the aid of a labelled diagram, describe how white light from car headlamps can be dispersed into its component spectrum colours.