K.C.S.E Biology Q & A - MODEL 2015PP2QN03
State two examples of discontinuous variation.
ANSWERS
​ (i) Sex;
(ii) ABO blood group system/Rhesus factor; (iii) Ability to roll tongue; (iv) Free or attached earlobe; (v) Presence/ absence of hair in the nose! on the ear pinna; (vi) Finger prints; ability to taste PTC (phenythiocarbamide) PTV (phenylthio urea) (vii) Winglength in prosophila; (viii) Size of abdomen in drosophila; (ix) Eye colour in prosophila; (x) Smooth/wrinkled seed coats in pea plants; (xi) Green/yellow seed coats/seed coat colour in pea plants; (xii) Polymorphism/melanic and non melanic forms in moths.
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K.C.S.E Biology Q & A - MODEL 2015PP2QN03
What is meant by the term genetics?
ANSWER
K.C.S.E Biology Q & A - MODEL 2015PP1QN20
Below are components of a simple reflex pathway:
List the components in their proper sequence during the transmission of a nerve impulse.
K.C.S.E Biology Q & A - MODEL 2015PP1QN14
Name two types of involuntary muscles in mammals.
b)State the location of each of the muscles named in (a) above.
answers
Cardiac muscles - heart K.C.S.E Biology Q & A - MODEL 2015PP1QN10
The diagram below illustrates the skulls of adult human and chimpanzee.
​(a) State one difference between the two skulls in the following structures:
​(b) State the significance of the evolution observed on the parietal bone in the chimpanzee and human skulls.
K.C.S.E Biology Q & A - MODEL 2015PP1QN04
Colour blindness is a sex linked trait controlled by a recessive gene b. If a mother is a carrier and the father is normal, what is the chance that their son will be colour blind? Show your working.
K.C.S.E Biology Q & A - MODEL 2015PP1QN02
During a lesson, students observed the structure of bat, cat and human forelimbs to determine their evolutionary relationship.
(a) State the name given to the structure of the limbs observed by the students. (b) Name the type of evolution illustrated by the structure of the limbs observed. (c) What evidence of evolution is illustrated by the limbs? (d) State the significance of the type of evolution illustrated by the limbs.
answers
​(a) The pentadacty/ limb/homologous structures;
(b) Divergent evolution/adaptive radiation; (c) Comparative anatomy; (d) It allows the organisms to exploit different habitats to reduce competition; K.C.S.E Biology Q & A - MODEL 2014PP2QN05
The diagram below represents the transverse section of the spinal cord.
​(a) Name the part labelled H.
(b) State two functions of the fluid found in the part labelled J. (c) Give a reason for the colour of white matter. (d) Name and give the function of the enzyme found at the part labelled K. Name Function (e) On the diagram, use an arrow to show the direction of impulse transmission along the neurone labelled 1.
answers
(a) H - cell body;
(b) Has nutrients for nourishment of neurons, brain, spinal cord; ​Acts as a shock absorber for protection of spinal cord from mechanical damage; (c) Contains myelin sheaths (of neurons which are made up of fats that make it have a shiny white appearance); (d) Cholinesterase: Breaks down Acetyicholine; to acetic acid and choline; (e) Correct arrow on neurone 1 points towards the grey matter;
K.C.S.E Biology Q & A - MODEL 2014PP2QN04
Explain why people with sickle cell trait have an adaptive survival advantage over normal individuals in malaria endemic regions.
answers
K.C.S.E Biology Q & A - MODEL 2014PP2QN04
Differentiate between sickle cell anaemia and sickle cell trait.
answers
K.C.S.E Biology Q & A - MODEL 2014PP2QN04
How is sex determined in man?
answers
K.C.S.E Biology Q & A - MODEL 2014PP1QN22
Why are some bacteria able to resist the effect of antibiotics?
ANSWER
K.C.S.E Biology Q & A - MODEL 2014PP1QN22
Name two vestigial structures in human beings.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN21
Name the type of skeleton that makes tip each of the following animals:
(a) locust (b) bird.
ANSWERS
​(a) Exoskeleton;
(b) Endoskeleton;
K.C.S.E Biology Q & A - MODEL 2014PP1QN17
Give a reason why the image is not formed when light is focused on the blind spot.
ANSWER
K.C.S.E Biology Q & A - MODEL 2014PP1QN16
The diagram below illustrates a nerve cell.
​(a) Name the type of nerve cell illustrated.
(b) Give a reason for your answer in (a) above (c) identify the part labelled J (d) State one function of each of the parts labelled G and H. (i) G (ii) H
ANSWERS
(a) Sensory neurone;
(b) Cell body is located off the axon/tied outside the CNS; (c) Schwann cell; (d) (i) Receipt/transmits impulses to neighbouring neurons in the CNS from sense organs; (ii) Insulates the axon/accept dendron for axon;
K.C.S.E Biology Q & A - MODEL 2014PP1QN15
Distinguish between a tendon and a ligament.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN15
Which type of mammalian muscles is voluntary’?
ANSWER
K.C.S.E Biology Q & A - MODEL 2014PP1QN14
State three structural differences between DNA and RNAK.C.S.E Biology Q & A - MODEL 2014PP1QN13
State one function of each of the following parts of a mammalian eye:
(a) eye lashes (b) lachrymal glands.
ANSWERS
​(a) Trap foreign particles entering the eye;
Produce fluid/tears; (b) Moistens the cornea; Wash foreign materials out of the eye; Antiseptic / kills harmful microorganisms; K.C.S.E Biology Q & A - MODEL 2014PP1QN11
State three differences between tactic and tropic responses.
K.C.S.E Biology Q & A - MODEL 2014PP1QN09
State two functions of intervertebral discs in the mammalian skeleton.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2014PP1QN08
Differentiate between phenotype and genotype as used in genetics.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2013PP2QN05
The diagram below represents a mammalian pelvic girdle.
​(a) How are the structures labelled H and J adapted to their function?
(i) H (ii) J (b) State the function of obturator foramen. (c) (i) Name the bone that articulates with the pelvic girdle at acetabulum. (ii) Name the type of joint formed by the acetabulum and the bone named in (c)(i) above. (d) Name the bone formed by the fusion of caudal vertebrae inhuman beings.
answers
K.C.S.E Biology Q & A - MODEL 2013PP2QN04
In an investigation, a variety of pea plants grown from seeds with smooth coats were crossed with plants grown from seeds with wrinkled coats. All the seeds obtained in the first filial (F1) generation had smooth seed coats.
​(a) Using the letter R to represent the gene for smooth seed coat, work out the genotype of the F1 generation. Show your working.
(b) If the F1 generation was sel fed, determine the phenotypic ratio of the second filial (F,) generation. Show your working. (c) If the total number of seeds in the F, generation was 14 640, calculate the number of seeds with wrinkled coats. Show your working. |
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