CSEC Biology · January 2011 · Paper 2

32 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 marksIdentify TWO parts of a flowering plant where food is stored.
2. 1(a)(ii)2 marksName TWO food nutrients in plant storage organs that humans use as food.
3. 1(b)(i)9 marksComplete Table 1 by describing the method and conclusion for EACH food test the students carried out.
4. 1(b)(ii)4 marksExplain why the storage organ tested in (b)(i) should be included in the diet of a teenage boy.
5. 1(b)(iii)3 marksA boy fed ONLY on the storage organ tested in (b)(i) was found to be malnourished. Explain how this is possible.
6. 1(c)3 marksNo test for fats was conducted on the storage organ in (b)(i). Describe TWO tests for fats.
7. 1(d)2 marksFood is also stored in animals. Identify TWO areas in the human body where food is stored.
8. 2(a)(i)5 marksComplete Table 2 to show the differences between plant and animal cells.
9. 2(a)(ii)2 marksState ONE function of EACH of the following organelles: Mitochondrion, Chloroplast.
10. 2(b)(i)1 markName the process that causes the change in the appearance of both cells.
11. 2(b)(ii)2 marksExplain why the process named in (b)(i) above is important to plant cells.
12. 2(b)(iii)1 markThe plant cell becomes turgid after one hour. Suggest why cell turgidity is useful to the plant.
13. 2(b)(iv)4 marksWhy does the animal cell burst but the plant cell does not?
14. 3(a)5 marksFrom Table 3, identify organisms at EACH trophic level shown in Table 4. Write your answer in the spaces provided in Table 4.
15. 3(b)(i)2 marksGive TWO examples of decomposers.
16. 3(b)(ii)3 marksWhy are decomposers important to organisms in a food web?
17. 3(c)2 marksIdentify TWO factors or activities, OTHER THAN feeding, that are necessary for the survival of organisms in an ecosystem.
18. 3(d)3 marksThe size of a population of organisms may change from time to time. Name THREE physical factors that affect the size of populations in an ecosystem.
19. 4(a)(i)7 marksUsing a diagram to illustrate the circulatory system, describe how oxygenated blood from the lungs is distributed to organs and tissues.
20. 4(a)(ii)7 marksExplain how oxygen becomes available to a muscle tissue for respiration.
21. 4(b)(i)4 marksGive TWO characteristics of aerobic respiration.
22. 4(b)(ii)4 marksIn the absence of sufficient oxygen, anaerobic respiration occurs. Suggest ONE disadvantage of anaerobic respiration.
23. 4(c)4 marksTransport vessels in plants have features that are similar to transport vessels in animals. Describe TWO ways in which xylem tissues are similar to blood vessels.
24. 5(a)2 marksIdentify ONE communicable disease and the pathogen that causes the disease.
25. 5(b)(i)6 marksDescribe how a vaccine works in building immunity.
26. 5(b)(ii)6 marksSuggest why vaccines may NOT always have the desired effect in treating persons infected with disease.
27. 5(c)(i)7 marksSuggest why this method of control is sometimes used.
28. 5(c)(ii)7 marksGive TWO economic and TWO social consequences of widespread disease among crop plants.
29. 6(a)4 marksDifferentiate between an 'allele' and a 'gene'.
30. 6(b)(i)8 marksUsing P as the symbol, state the possible genotypes of the purple flowers.
31. 6(b)(ii)8 marksA plant breeder obtained flowers that were purple in successive crops of the same plant species. However, in one crop he obtained a few white flowers. Using a genetic diagram, illustrate how he got white flowers in a…
32. 6(c)3 marksGenetically identical offspring sometimes show differences in phenotype. Suggest why such differences may occur.