CSEC Biology · May/June 2018 · Paper 2

28 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)2 marksState TWO precautions that they should take in carrying out this experiment.
2. 1(a)(ii)4 marksThe results of their experiment are presented in Table 1. On the grid provided in Figure 1 on page 5, draw a graph to represent the results presented in Table 1.
3. 1(a)(iii)1 markFrom the graph in Figure 1, identify the optimum temperature for the protease activity.
4. 1(a)(iv)4 marksSuggest ONE reason for the shape of the graph at less than 10 °C, TWO reasons for the shape of the graph between 10 and 55 °C, and ONE reason for the shape of the graph at more than 55 °C.
5. 1(a)(v)3 marksDescribe a suitable procedure that the scientists could use to investigate the effect of pH on the activity of the protease enzyme.
6. 1(b)(i)4 marksName the parts labelled I, II, III and IV in Figure 2.
7. 1(b)(ii)4 marksDescribe how the structures named in (b)(i) help humans to regulate their body temperature.
8. 1(c)3 marksExplain how changes in the epidermal cells of leaves help plants to conserve water during high temperatures.
9. 2(a)(i)3 marksName the types of cell labelled A, B and C in Figure 3.
10. 2(a)(ii)2 marksName TWO structures that are common to the three types of cell.
11. 2(a)(iii)2 marksState TWO differences between the type of cell labelled A and the type of cell labelled C.
12. 2(b)4 marksTissues made up of Type B cells are placed in a container of concentrated salt solution and left for one hour. Describe THREE changes in the appearance of the cells after one hour in the concentrated salt solution, and…
13. 2(c)4 marksTissues made up of Type A cells and Type B cells are placed in a container of distilled water and left for one hour. Describe how the appearance of Type A cells is expected to differ from that of Type B cells and give…
14. 3(a)6 marksComplete the table by matching EACH labelled part of the eye to its function. Write the letter and the name of the part.
15. 3(b)1 markName ONE type of light sensitive cell found in the retina.
16. 3(c)2 marksExplain why colours are seen less clearly in dim light than in bright light.
17. 3(d)6 marksA colour-blind woman mates with a man who has normal colour vision. Determine the probability of this couple having a colour-blind daughter by completing the genetic diagram below.
18. 4(a)6 marksName the parts labelled A, B, C, D, E and F in the space provided.
19. 4(b)4 marksState TWO characteristics that the respiratory surface used for gaseous exchange in human beings has in common with the respiratory surface used in flowering plants. Explain how EACH characteristic makes the respiratory…
20. 4(c)(i)3 marksOutline the effects of THREE named components of cigarette smoke, other than nicotine, on the human body.
21. 4(c)(ii)2 marksOutline TWO ways in which the use of nicotine in electronic cigarettes may be harmful to the human body.
22. 5(a)6 marksName THREE components of human blood that are important in protecting the body against pathogenic diseases and state the function of EACH.
23. 5(b)5 marksExplain how the type of immunity that Marianne acquired from breastfeeding differs from the type of immunity that her father acquired from his vaccine. In your explanation, state the name of EACH type of immunity.
24. 5(c)4 marksSuggest TWO reasons why some parents may have a valid concern about immunizing their children and TWO reasons why the authorities maintain their position on preventing the entry of unvaccinated children.
25. 6(a)6 marksDescribe how the process of mitosis results in the production of identical cells in asexual reproduction.
26. 6(b)5 marksPlants that reproduce sexually have some advantages compared to those that reproduce only asexually. Outline TWO advantages and THREE disadvantages of sexual reproduction.
27. 6(c)(i)2 marksSuggest TWO reasons why humans may choose to clone animals.
28. 6(c)(ii)2 marksOutline TWO ethical issues related to the cloning of humans.