CSEC Biology · May/June 2019 · Paper 2

30 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)4 marksDescribe the procedure that uses the apparatus shown in Figure 1 to investigate the rate of transpiration of the potted plant within the 12-hour period.
2. 1(a)(ii)1 markState ONE precaution that should be taken to ensure that the results are accurate.
3. 1(a)(iii)2 marksSuggest TWO factors that may affect the rate of transpiration of the potted plant.
4. 1(b)(i)4 marksDraw a suitable table and record the results presented in the graph in Figure 2.
5. 1(b)(ii)1 markDuring what time period was the rate of transpiration highest?
6. 1(b)(iii)6 marksSuggest TWO reasons for the shape of the graph during EACH of the following time periods: 6 a.m. to 8 a.m., 9 a.m. to 11 a.m., 12 noon to 2 p.m.
7. 1(c)(i)3 marksDiscuss how transpiration helps plants to move water from their roots to their leaves.
8. 1(c)(ii)2 marksWhile absorbing water from the soil, plants absorb mineral salts such as magnesium, calcium and nitrogen. State ONE role of magnesium and ONE role of calcium in plants.
9. 1(c)(iii)2 marksNitrogen is used by plants to make protein. Suggest TWO reasons why plants need protein.
10. 2(a)4 marksState the name of the processes numbered I to IV.
11. 2(b)(i)1 markName ONE type of organism responsible for decomposing organic waste.
12. 2(b)(ii)4 marksExplain TWO ways in which the type of nutrition carried out by the organism named in (b)(i) is different from that carried out by plants.
13. 2(b)(iii)2 marksState TWO reasons why the type of organism named in (b)(i) is important in an ecosystem.
14. 2(c)(i)2 marksSuggest TWO reasons why carbon dioxide is described as a greenhouse gas.
15. 2(c)(ii)2 marksWith reference to the carbon cycle, suggest TWO strategies individuals can use to reduce the amount of carbon dioxide in the atmosphere.
16. 3(a)4 marksLabel, on the diagram, the FOUR structures that are directly involved in breathing.
17. 3(b)4 marksState how any THREE of the structures labelled in (a) function in breathing during inhalation.
18. 3(c)4 marksExplain how any TWO features of the human lung make it an efficient respiratory surface.
19. 3(d)4 marksBreathing rate can be affected by several factors. Explain how exercise and smoking may affect a person's breathing rate.
20. 4(a)6 marksDescribe TWO events that occur in EACH of the following stages of meiosis I: Prophase I, Anaphase I, Telophase I.
21. 4(b)(i)3 marksMutation and sexual reproduction are two processes which can lead to variation in the population of a species. State ONE way in which both processes are similar and TWO ways in which they differ.
22. 4(b)(ii)4 marksExplain the difference between variation in a community and variation in a population, and suggest ONE way in which diversity benefits the community.
23. 4(c)2 marksBriefly explain how bacteria may become resistant to antibiotics.
24. 5(a)6 marksDescribe the location and structure of the normal human female reproductive system.
25. 5(b)3 marksSuggest ONE temporary contraceptive method that the couple could use to prevent pregnancy at EACH of the following stages: Preventing fertilization, Preventing ovulation, Preventing implantation.
26. 5(c)6 marksExplain how EACH contraceptive method suggested in (b) works to prevent pregnancy at each of the following stages.
27. 6(a)3 marksState the name of the final products of digestion for EACH of the following types of nutrients: Carbohydrate, Protein, Fat/lipid.
28. 6(b)3 marksIn addition to the macronutrients in (a), list three other types of nutrients in a diet that would promote the maintenance of good health.
29. 6(c)(i)6 marksExplain how the concentration of sugar in Marvin's blood is kept within the normal range several hours before AND after he eats a carbohydrate meal.
30. 6(c)(ii)3 marksExplain why Mary is advised to limit her consumption of simple carbohydrates.