Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2008PP2QN02
What is a test – cross?
answers
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K.C.S.E Biology Q & A - MODEL 2008PP2QN02
A pea plant with round seeds was crossed with a pea plant that had Wrinkled seeds the gene for round seeds is dominant over that for wrinkled seeds
Using letter R to represent the dominant gene state: (a) The genotype of parents if plant with round seed was heterozygous (b) The gametes produced by the round and wrinkled seed parents
K.C.S.E Biology Q & A - MODEL 2008PP1QN30
The diagram below shows two fused bones of a mammal
(a) Identify the fused bone
(b) Name the (i) Bone that articulates at the point labelled F (ii) The hole labelled G
ANSWERS
(a)Pelvic girdle
(b) (i) Femur (ii) Obturatar foramen.
K.C.S.E Biology Q & A - MODEL 2008PP1QN13
State two characteristics of the image formed on the retina
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN13
Name the part of retina where image is formed
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN07
How does convergent evolution occur
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K.C.S.E Biology Q & A - MODEL 2008PP1QN07
what is fossil
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP2QN07
Describe the structure and functions of the various parts of the human ear
answers
The ear is an organ involved in perceiving sound and maintaining body balance and posture. It is made of the following sections
Pinna – That is funnel shaped structure made of skin and cartilage. It receives sound waves and directs them to the ear tube. External/auditory meatus – That is a canal lined with air and wax. It allows passage of sound waves to the middle ear. The hairs and wax trap dust particles that enter the ear. Tympanic membrane – That is a thin flexible sheet-like structure receives sound waves and pass the vibration to the ossicles. Middle ear that is composed of Tiny bones known as ossicles – They are anvil and incus. They amplify vibration from the tympanic membrane. Eustachian tube – That connects the ear to the nasal cavity. It balances pressure on both sides of the tympanic membrane. Oral window – That is a thin flexible membrane that opens into the inner ear. it receives vibrations from the ossicles and passes them to the inner ear. Inner ear that is compost of; Vestibular apparatus- That are the semicircular canals, utricles and saccules. They help in maintenance of body balance and posture. Cochlea – That is a coiled structure that has sensory cells for hearing. It connected to the auditory nerve that is involved in transmission of sounds to the brain
K.C.S.E Biology Q & A - MODEL 2007PP2QN05
What is meant by hybrid vigour?
answer
K.C.S.E Biology Q & A - MODEL 2007PP2QN05
What is genetic engineering?
answer
K.C.S.E Biology Q & A - MODEL 2007PP2QN05
In maize the gene for purple colour is dominant to the gene for white colour. A pure breeding maize plant with purple grains was crossed with a heterozygous plant.
(a) (i) Using letter G to represent the gene for purple colour, work out the genotype ratio of the offspring (ii) State the phenotype of the offspring
K.C.S.E Biology Q & A - MODEL 2007PP2QN04
State two advantages of having an exoskeleton
answers
K.C.S.E Biology Q & A - MODEL 2007PP2QN04.
State the functions of synovial fluid
answers
K.C.S.E Biology Q & A - MODEL 2007PP2QN04
State the difference between ball and socket and hinge joint
answers
Name the three type of muscles found in mammals and give an example of where each of them is found21/6/2020
K.C.S.E Biology Q & A - MODEL 2007PP2QN04
Name the three type of muscles found in mammals and give an example of where each of them is found
K.C.S.E Biology Q & A - MODEL 2007PP1QN24
Name two tissues in plants that provide mechanical support
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN24
State a characteristics that is common to all cervical vertebrae
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN23
What is thigmotropism?
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN22
The diagram below represents a neurone
​(i) Name the neurone
(ii) Name the parts labeled P and Q P……………………………………………………………………….. Q………………………………………………………………………. (c) State a function of myelin sheath
ANSWERS
​(b) Motor neutron
(ii) P- Dendrites Q- Axoplasm (Axon) (d) Insulates the axon
K.C.S.E Biology Q & A - MODEL 2007PP1QN22
Where in the human body are relay neurons found
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN21
Give a reason why organisms become resistant to drugs
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN21
What is adaptive radiation
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN20
What is a test- cross?
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN20
Explain how the following occur during gene mutation:
(i) Deletion (ii) Inversion
ANSWERS
(i) Occurs when some nucleotides of a part of a gene break off and disappear
(ii) Occurs when the nucleotides of a part of gene become inverted by taking a 1800 turn.
K.C.S.E Biology Q & A - MODEL 2007PP1QN20
What is meant by the term allele?
ANSWER
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