CSEC Biology · January 2012 · Paper 2

36 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)4 marksList the apparatus and materials and describe the method of this investigation.
2. 1(b)4 marksConstruct a table to represent the data shown in Figure 1.
3. 1(c)(i)2 marksExplain the results obtained when the potato strips were placed in pure water.
4. 1(c)(ii)4 marksExplain the results obtained when the potato strips were placed in sugar solution less than 1.0 M and greater than 1.0 M.
5. 1(c)(iii)1 markName the process responsible for the results obtained in this experiment.
6. 1(c)(iv)1 markSuggest ONE possible source of error in this experiment.
7. 1(d)(i)3 marksExplain why the appearance of an animal cell would be different from that of a plant cell after immersion in pure water for 30 minutes.
8. 1(d)(ii)3 marksExplain why the appearance of an animal cell would be different from that of a plant cell after immersion in concentrated sugar solution for 30 minutes.
9. 1(e)1 markName another process by which substances can move in and out of cells.
10. 1(f)2 marksGive TWO reasons why living organisms need to move substances in and out of their cells.
11. 2(a)5 marksName the parts labelled A, B, C, D and E in Figure 2.
12. 2(b)3 marksSuggest THREE ways in which Part B in Figure 2 is adapted for its functions.
13. 2(c)3 marksHumans have an omnivorous diet. Suggest how the human digestive system is adapted to break down the different types of food that humans eat.
14. 2(d)(i)2 marksState the digestive functions of the liver and the pancreas in a human.
15. 2(d)(ii)2 marksSuggest TWO consequences of the malfunctioning of the pancreas.
16. 3(a)3 marksComplete Table 2 to show how sex is inherited in humans.
17. 3(b)(i)2 marksLabel the parts in Figure 3 where sex cells/gametes are found.
18. 3(b)(ii)2 marksOutline the process by which gametes are formed.
19. 3(b)(iii)1 markIf a plant has a diploid chromosome number of 8, how many chromosomes would be found in its gametes?
20. 3(c)2 marksSuggest TWO ways in which the process of meiosis may be useful to plants.
21. 3(d)3 marksA horticulturalist has a crop of plants that produces both red and white flowers. However, more red flowers are produced than white. A red-flowered plant is crossed with a white-flowered plant and the offspring produced…
22. 3(e)2 marksJohn and Jake grew plants with the same genotype. Jake's plants produced smaller flowers than John's plants. Account for the difference in size of these flowers.
23. 4(a)5 marksDescribe photosynthesis in green plants.
24. 4(b)3 marksWith the aid of a fully annotated diagram, explain how the visible external features of a green dicotyledonous leaf aid the process of photosynthesis.
25. 4(c)(i)3 marksWhen leaves fall from plants, microorganisms feed on them. What is the name given to these microorganisms?
26. 4(c)(ii)3 marksExplain how this type of nutrition differs from photosynthesis.
27. 4(d)4 marksThere are advantages and disadvantages when leaves fall from plants. Suggest TWO advantages and TWO disadvantages to a plant, when leaves fall from it.
28. 5(a)8 marksWith the aid of a fully labelled diagram of the heart, explain how blood is pumped to the rest of the body.
29. 5(b)(i)7 marksSuggest why vaccination is NOT effective in the prevention, treatment or control of most diseases of the heart and blood vessels.
30. 5(b)(ii)7 marksExplain why there is an increase in the number of white blood cells in a patient following heart surgery.
31. 6(a)(i)6 marksDistinguish between a community and a habitat.
32. 6(a)(ii)6 marksSome students want to investigate the distribution of species found in a forest while another group wants to investigate the distribution of species in a pond. Describe the sampling technique that the students could use…
33. 6(b)(i)9 marksDescribe TWO types of feeding relationships that exist in an ecosystem and give an example of EACH type.
34. 6(b)(ii)9 marksConstruct a food web which describes the trophic relationship among four organisms in a community.
35. 6(b)(iii)9 marksState which organism(s) in your web would have the least amount of energy available.
36. 6(b)(iv)9 marksDescribe TWO ways in which the natural balance in a community may be disrupted.