CSEC Biology · January 2019 · Paper 2

35 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)2 marksOutline the procedure used to prepare the sample for carrying out the food tests.
2. 1(b)6 marksComplete Table 1 by describing the procedure that is used to test for the presence of EACH food nutrient in the meal and the expected results if the food nutrient is present.
3. 1(c)(i)2 marksName ONE enzyme involved in the chemical digestion of carbohydrates and ONE enzyme involved in the chemical digestion of proteins in the alimentary canal.
4. 1(c)(ii)4 marksSuggest ONE reason why it is important for the recovering child to eat adequate amounts of carbohydrates and THREE reasons why it is important for the recovering child to eat adequate amounts of proteins.
5. 1(d)(i)2 marksSuggest TWO ways in which the type of nutrition carried out by green plants differs from that carried out by humans.
6. 1(d)(ii)3 marksDescribe the procedure to test for the presence of starch in a leaf taken from a green plant.
7. 1(d)(iii)2 marksExplain why plants store most carbohydrates in the form of starch instead of in the form of a reducing sugar.
8. 1(d)(iv)4 marksSuggest TWO reasons why it is important for plants to store starch.
9. 2(a)(i)2 marksName TWO biotic factors and ONE abiotic factor that may account for the extinction of a species.
10. 2(a)(ii)4 marksState TWO activities of humans which may have a negative impact on species diversity and TWO measures that may be taken to reduce the impact of these activities.
11. 2(b)(i)1 markLabel on the graph the curve which represents the predator, using the letter A.
12. 2(b)(ii)2 marksUse the number of organisms and the shape of the curves to state TWO reasons for your answer in (b) (i).
13. 2(b)(iii)1 markAssuming that the population of the predator drops to zero, extend the curve of the prey population on the graph. (Assume that no other changes have occurred in this community.)
14. 2(b)(iv)1 markAssuming that the population of the prey drops to zero, extend the curve of the predator population on the graph. (Assume that no other changes have occurred in this community.)
15. 2(c)3 marksSuggest THREE possible reasons for the lower yield obtained in the plot with the larger number of seeds.
16. 3(a)(i)2 marksWhat is the effect on the expression of phenotype for continuous and discontinuous variation?
17. 3(a)(ii)1 markState how the data for continuous variation should be presented graphically.
18. 3(b)(i)2 marksState ONE characteristic of human beings that shows continuous variation.
19. 3(b)(ii)2 marksState ONE characteristic of human beings that shows discontinuous variation.
20. 3(c)2 marksState TWO cellular components of blood.
21. 3(d)(i)4 marksComplete the genetic diagram below to show how this is possible.
22. 3(d)(ii)1 markWhat is the genotype of the child with blood group O?
23. 3(e)3 marksSuggest THREE events which take place during sexual reproduction which may have led to the variation in the height of the two sisters.
24. 4(a)(i)6 marksWith the aid of a labelled diagram, describe how the mammalian heart pumps deoxygenated blood from the cells in the body to the lungs to become oxygenated.
25. 4(a)(ii)4 marksThe structure of arteries and veins differ from each other. Explain how TWO of these differences allow these blood vessels to carry out their functions.
26. 4(b)(i)3 marksState ONE similarity and ONE difference between the structure of a blood capillary and the structure of a xylem vessel found in the stem of a green plant.
27. 4(b)(ii)2 marksSuggest TWO reasons why green plants do not need to depend on xylem for transporting oxygen to their cells.
28. 5(a)2 marksDiseases may be categorized as pathogenic (P) when they are caused by a pathogen and hereditary (H) when they are caused by faulty genes. Classify the following diseases by inserting either 'P' for pathogenic or 'H' for…
29. 5(b)(i)5 marksDescribe how the mode of transmission of dengue fever differs from that of the human immunodeficiency virus (HIV). Use this difference and your knowledge of the immune system to suggest TWO reasons why John did not…
30. 5(b)(ii)4 marksCompare the treatment method normally used for a viral disease with the treatment method normally used for diabetes and compare ONE preventative measure normally used for a viral disease with ONE preventative measure…
31. 5(c)4 marksOutline TWO methods used to control the mosquito vector and for EACH method state the stage in the life cycle that is targeted.
32. 6(a)3 marksOutline ONE major function of EACH of the following parts of the human brain: Cerebrum, Cerebellum, Medulla.
33. 6(b)3 marksComplete the flow diagram in the following box to show the sequence of events involved in the pupil reflex.
34. 6(c)3 marksSuggest THREE conclusions that the paramedic may make if the accident victim is alive but shows no response to the pupil reflex test.
35. 6(d)6 marksExplain THREE physiological reasons why the consumption of excess alcohol could have caused the motorcyclist to crash.