Answer ALL questions
1. Explain the term Binomial Nomenclature. (1mk)
2. Name three forces involved in transportation of water and
mineral salts. (3mks)
3. (a) Give two roles of DNA. (2mks) (b) State the difference
between DNA and RNA.(1mk)
4. The diagram below represents a stage during cell division.
(a) (i) Identify the stage of cell division. (1mk)
(b) (ii) Give two reasons for your answer to (a) (i) above. (2mks) (b)
Name the structure labelled M. (1mk)
5. Study the diagram below and answer the questions that follow.
(a) Name the parts labelled:- (3mks) A:
……………………………………………….. C:
……………………………………………….. D:
………………………………………………..
(b) State the function of part labelled B. (1mk)
6. . (a) Explain what is meant by a test-cross as used in genetics.
(1mk) (b) Determine the probability of a couple with blood group
AB getting a child with blood group B. (Show your working).
7. Name the end products of the light stage of photosynthesis.
(2mks)
8. a) State the function of the following during cell division i)
Spindle fibres (1mark) ii) Centrioles (1mark)
9. .A certain metabolic pathway takes place following sequence. J-
K-L-M-N An inhibitor was added to the reactants during an
experiment. At the end of the experiment, there was more K and
little L, M and N.
a. At what stage of the sequence was the inhibitor added. (1mrk)
b. Briefly explain how the inhibitor affected the reaction. (2mrks)
10. The pedigree diagram shows the inheritance of colour
blindness (Daltonism) in a family. Colour blindness is sex-linked
and is caused by a recessive allele (d). The ability to see colour
normally is caused by a dorminant allele (D)
a) How many of the male offspring of parents 1 and 2 were normal?
(1mk) b) State the genotype of: i) Individual 2 (1mk) ii) Individual 5
(1mk) c) A person with a recessive allele for colour-blindness may
not be colour blind. Explain why males with allele for colour-
blindness are always colour-blind. (1mk)
d)If individual 5 marries a normal male, what percentage of their
daughters will have an allele for colour-blindness but will not be
colour-blind? Show your working. (4mks)
11. . The diagram below represents a nitrogen cycle
a) Name the groups of organisms represented by J (1mk) b) Name
the process represented by R, P M and N (4mks) c) Name one
process represented by T (1mk) d) i) Name a structure in roots
involved in process M (1mk) ii) State one adaptation of structure
named in (d) (i) above to its function (1mk).
12. The diagrams below show embryos of certain vertebrates
animals. Study them and answer the question that follows.
a) Mention two observable structural features in these embryos
that suggest that they have a common ancestral origin. (2marks)
(b)What phenomenon in organic evolution is exhibited by these
diagrams of embryos? (1mark)
13. The diagram below represents a cell at one stage of the cell
division.
(a) Identify the stage. (1 mark) i) Is the cell of a plant or an animal?
(1 mark) ii) Give a reason for your answer in (b)(ii) above. (1 mark)
14. The diagram below show various types of gene mutations.
i) Identify the type of mutations shown above (2 marks) ii) Name
one disorder that results from gene mutation II. (1 mark)
15. Study the flow chart below of a process that takes place in both
plants and animals.
a) Name the above process. (1mk) b)i) In the above process name
the chemical reaction represented by X. (1mark) ii) Name the part
of the cell where the enzyme controlled reactions in b(i) above
takes place. (1mark) c) Name the products Z in i)
Plants…………………………………………. (1mark) ii)
Animals…………………………………………………………. (1mark)
d)What would be the fate of pyruvic acid if oxygen supply is availed
in the mitochondria of an animal cell (2marks) (e) Define the term
oxygen debt (1mark)
16. The diagram below represents the female reproductive system.
(a) Name the structures labeled A and C (2 marks) (b) State the
conditions that results if implantation occurs at point labeled D. (1
marks) (c) Name the hormone secreted by the part labeled A and
for each give one function (4 marks) (d) What role does part labeled
B play during pregnancy? (1 mark)
17. The diagram shown below represents a section of the vertebral
column
a) Name the part labelled S (1mk b) State TWO ways in which part
T is important to movement in human beings (2mks
18. The following equation represents a section of the Nitrogen
Cycle
a) Name: i) Bacterium labelled Y
………………………………………………. (1mk ii) Compound X
………………………………………………………. (1mk b) Explain how
Process Z affect plant growth in an area? (2mks
19.
