K.C.S.E Biology Q & A - MODEL 2011PP1QN28
What is a tropic response?
ANSWERS
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K.C.S.E Biology Q & A - MODEL 2011PP1QN27
The diagram below represents features of a joint in a mammal.
​(a)Name the part labelled A.
(b) State the function of the part labelled B.
ANSWERS
​(a) Ligament;
(b) Secretes synovial fluid; contains/holds the synovial fluid in place;
K.C.S.E Biology Q & A - MODEL 2011PP1QN24
What would be the expected results from a test cross?
ANSWERS
K.C.S.E Biology Q & A - MODEL 2011PP1QN24
Differentiate between the following terms:
(i)dominant gene and recessive gene: (ii) continuous variation and discontinuous variation.
ANSWERS
​(i) Dominant gene expresses itself phenotypically in both its homozygous and heterozygous states while recessive gene can only express itself phenotypically in the homozygous state;
(ii) Continuous variation is a characteristic for which there is a continuum or range while discontinuous variation is a characteristic for which there are discrete categories or units;
K.C.S.E Biology Q & A - MODEL 2011PP1QN21
State two limitations of fossils as an evidence of evolution.
answers
K.C.S.E Biology Q & A - MODEL 2011PP1QN21
What is meant by convergent evolution?
answer
K.C.S.E Biology Q & A - MODEL 2010PP2QN05
When pure breeding black guinea pigs were crossed with pure breeding white guinea pigs, the offspring had a coat with black and white patches.
(a) Using letter G to represent the gene for black coat colour and letter H for white coat colour, work out the genotypic ratio of F2. (b) State the phenotypic ratio of F2. (c) (i) Name the term used when two alleles in heterozygous state are fully expressed phenotypically in an organism. (ii) Give an example of a trait in human beings where the condition whose term is named in (c) (i) above expresses itself. K.C.S.E Biology Q & A - MODEL 2010PP2QN04
The diagram below shows how the iris and pupil of a human eye appear under different conditions..
(a) Name the structures labelled X and Y.
X Y (b) (i) State the condition that leads to the change in appearance shown in the diagram labelled B. (ii) Describe the changes that lead to the appearance of the iris and pupil as shown in the diagram labelled B. (iii) What is the significance of the changes described in (b) (ii) above?
ANSWERS
(a) X Pupil;
Y Circular muscles; (b) (i) Dull/dim light/low light intensity; (ii) Circular muscles (in iris) relax; while radial muscles contract; the pupil becomes bigger; allowing more light to enter the eye; (iii) Allows one to visualize objects/see under dim light; K.C.S.E Biology Q & A - MODEL 2010PP1QN27
Give an example of a genetic disorder caused by:
(i) non-disjunction; (ii) gene mutation.
answers
(i) Down’s syndrome/Turner’s syndrome/Klinefelter’s syndrome;
(ii) Albinism/single cell anaemia/haemophilia/colour blindness;
K.C.S.E Biology Q & A - MODEL 2010PP1QN27
What is meant by the term non-disjunction?
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN26
State one survival value for each of the following in plants:
(a) Thigmotropism in stems; (b) Geotropism in roots.
answers
(a) Provides support;
Enables plants to grow towards light; Any one (b) In search of nutrients Anchorage;
K.C.S.E Biology Q & A - MODEL 2010PP1QN24
Why is Lamark’s theory not acceptable?
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN24
State two ideas proposed by Lamark in his theory of evolution.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN21
The diagram below represents part of the human skeleton.
(a) Name the part labelled P.
(b) (i) Name the bone that articulates with the part labelled Q. (ii) What type of joint is formed between the part labelled Q and the bone named in (b)(i) above? .
answers
(a) P sutures;
(b) (i) Atlas; (ii) Hinge joint; K.C.S.E Biology Q & A - MODEL 2010PP1QN06
State one function for each of the following:
(a) Cerebellum; (b) Medulla oblongata.
answers
(a) Co-ordinates balance;
(b) Controls heart beat/blood pressure/breathing rate; K.C.S.E Biology Q & A - MODEL 2009PP2QN04
(a) (i) Explain the changes that take place in the pupil and iris of a human eye when a person moves from a dark room to a room with bright light
(ii) What is the significance of the changes explained in (a) above (b) How does the human eye obtain nutrients? (c) Explain why images that form on the blind spot are not perceived
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN03
Give an example of biological control
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN01
When the offspring of purple and white flowered pea plants were crossed, they produced purple and white flowered plants in the ratio of 3: 1 Using letter H to represent the gene for purple colour
(a) State the genotype of: (i) Parents (ii) F1 Generation (b) Work out the cross between plants in the F1 generation (c) Account for the colour the flowers in plants of the F1 generation K.C.S.E Biology Q & A - MODEL 2009PP1QN12
The diagram below represents a bone obtained from a mammal
​(a) Name the bone
(b) Name the: (i) Bone which articulate with the bone named in (a) above at the cavity labeled K; (ii) Joint formed by the two bones (c) State the function of the part labeled J
ANSWERS
(a) scapula;
(b) (i) Humerus (ii) Ball and socket joint (c) Attachment of muscles
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Explain why certain drugs become ineffective in curing a disease after many years of use.
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Give an example of a vestigial structure in human
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP2QN04
Why is movement necessary in animals
answers
K.C.S.E Biology Q & A - MODEL 2008PP2QN04
Give three reasons in each case why support is necessary in
(i) Plants (ii) animals
answers
(i) Plants
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