CAPE Biology Unit 1 · 2008 · 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)4 marksIdentify the structures labelled A to H.
2. 1(b)4 marksIn the space provided, draw a plan diagram to show the distribution of the different types of tissues in Box A in Figure 1. Make your drawing the actual size of Box A. (No labels required).
3. 1(c)1 markIf the photograph in Figure 1 has been magnified 100 times, what is the actual width of the specimen from X1 to X2?
4. 1(d)(i)2 marksAccount for the difference in clarity between the two photographs.
5. 1(d)(ii)4 marksComment on the advantages and limitations of using a light microscope as compared to an electron microscope to examine cells or tissues.
6. 2(a)(i)1 markState the genotype of the F1 plant.
7. 2(a)(ii)1 markState the phenotype of the F1 plant.
8. 2(b)1 markState the FOUR different combinations of the alleles carried in the gametes of this F1 dihybrid plant (plant produced in (a) above).
9. 2(c)(i)2 marksUse the Punnett Square shown in Table 1 to show the genotypes of the F2 generation of this dihybrid cross.
10. 2(c)(ii)3 marksGive the ratio of red : pink : white flowers.
11. 2(d)4 marksComplete the Chi-squared calculation in Table 2 and the final Chi-squared sum using the formula provided.
12. 2(e)(i)1 markHow did the students determine the degrees of freedom?
13. 2(e)(ii)2 marksThe students checked the 5% probability in order to determine whether the result was significant or insignificant. What was their decision, and why?
14. 2(e)(iii)1 markIf the Chi-squared value had been 7.0, what information could have been gained concerning the results of the monohybrid cross experiment?
15. 3(a)(i)4 marksState FOUR structural differences observed between the ovum and the sperm.
16. 3(a)(ii)4 marksBased on features observed, comment, using two points, on how the ovum and the sperm are suited to their respective functions.
17. 3(b)2 marksExplain why some scientists regard the ovum at the stage shown in Figure 3, to be a secondary oocyte.
18. 3(c)(i)4 marksOn the graph grid on page 11, plot a graph to show the relationship between sperm velocity and fertilisation.
19. 3(c)(ii)1 markSuggest a likely conclusion from the findings of this experiment.
20. 4(a)3 marksBy means of a diagram, show the molecular structure of sucrose. Show the position of the oxygen and all other groups, EXCEPT for the H,OH groups on the No. 2, 3 and 4 carbons of glucose, and the 1, 3 and 4 carbons of…
21. 4(b)(i)4 marksRelate the structure of the water molecule to its solvent properties.
22. 4(b)(ii)4 marksRelate the structure of the water molecule to its high surface tension.
23. 4(c)(i)8 marksExplain the mode of enzyme action according to the 'lock and key hypothesis'.
24. 4(c)(ii)8 marksComment on differences in the way in which competitive and non-competitive inhibitors affect enzyme activity.
25. 5(a)7 marksState TWO ways in which variation can occur in sexually produced organisms and by means of a graph and an example, explain what is meant by EACH of the following: (i) 'Directional selection' (ii) 'Stabilising selection'
26. 5(b)4 marksOutline the FOUR key steps involved in producing a recombinant piece of gene.
27. 5(c)4 marksIn general terms, discuss FOUR major issues associated with applications of genetic engineering.
28. 6(a)(i)5 marksDiscuss the biological basis for the rhythm method of contraception.
29. 6(a)(ii)5 marksDiscuss the biological basis for the contraceptive pill method of contraception.
30. 6(b)2 marksBriefly comment on the role of the placenta as a guardian for the developing foetus.
31. 6(c)4 marksDescribe the structure of a young plant ovule.
32. 6(d)4 marksDiscuss the relative merits of cross-fertilisation and self-fertilisation in plants.