Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2002PP1QN17
What structures are produced by sisal for vegetative propagation?
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K.C.S.E Biology Q & A - MODEL 2002PP1QN16
The diagram below represents part of phloem tissue.
​a) Name the structures labeled R and S and the cell labeled T.
R S Cell labeled T b) State the function of the structure labeled S c) Explain why xylem is a mechanical tissue
answers
​(a) R. Sieve pore
S- cytoplasmic strand, cytoplasmic filaments rej. Proto plasmic strand) Cell labeled T (b) Translocation (L is tied with structures) (c) Thickened and lignified. K.C.S.E Biology Q & A - MODEL 2002PP1QN15
Ascaris lumbricoides in an example for an endo – parasite
a) The name Ascaris refers to b) State the habitat of the organism c) State three ways in which the organism is adapted to living in its habitat.
answers
(a) Genus
(b) Ileum/ colon/ duodenum/ intestines/ of humans or intestines of pig (c) Lack of elaborate elementary canal ( simple guts) can tolerate raw corn Thick cuticle pellicle, reject the outer covering lays many eggs Mouthparts for sucking partly digested food
K.C.S.E Biology Q & A - MODEL 2002PP1QN14
Distinguish between divergent and convergent evolution giving example in each case.
answers
​Divergent basic structural form is modified to serve different functions; e.g. vertebrate forelimbs, break structure in birds/ feet in birds’ convergent different structures are modified to pass or similar functions e.g. wings and birds and insects/ eye of human and octopus, vertebrates for humans e.g. squeal, legs of vertebrae and insects .
K.C.S.E Biology Q & A - MODEL 2002PP1QN14
State two ways in which Home sapiens differs from Homo habilis
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K.C.S.E Biology Q & A - MODEL 2002PP1QN14
What is organic evolution
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K.C.S.E Biology Q & A - MODEL 2002PP1QN13
The chart below shows the number of chromosomes before and after cell division and fertilization in a mammal.
a) What type of cell division takes place at Z
b) Where in the body of a female does process Z occur c) On the chart, indicate the position of parents and gametes d) Name the process that leads to addition or loss of one or more chromosomes. e) State three benefits of polyploidy in plants to a farmer
answers
​a) Meiosis
b) Ovary c) parent must be the 2n top; any ‘n’ is a gamete d) Non – dysfunctions e) increased yields / highbred Vigor, Resistance decreases Resistance to drought. K.C.S.E Biology Q & A - MODEL 2002PP1QN12
The chart below represents a simplified carbon cycle.
​(a)Name the process labeled A, B, and C
A B C b) Name the organisms X and Y X Y c) State the importance of carbon cycle in nature
answers
​ a) A A photosynthesis
B Decomposition / decay C Respiration b) X Bacterial Y Fungi c) Regulate the CO2 in the atmosphere. K.C.S.E Biology Q & A - MODEL 2002PP1QN11
Give an example of a sex – linked trait in humans on:
Y CHROMOSOME. X CHROMOSOME.
answers
​Y CHROMOSOME
Tuft and hair sprouting from pinna / baldness; hairy pinna; X CHROMOSOME Colour blindness / haemophilia.
K.C.S.E Biology Q & A - MODEL 2002PP1QN10
What happens to excess fatty acids and glycerol in the body?
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K.C.S.E Biology Q & A - MODEL 2002PP1QN09
Name two gaseous exchange structures in higher plants.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN08
Which type of joint is found at the articulations of
a) Pelvic girdle and femur b) Humerus and ulna
answers
a) Ball and socket
b) Hinge Explain why the carrying of wild animals is higher than that for cattle in a given piece of land.17/6/2020
K.C.S.E Biology Q & A - MODEL 2002PP1QN07​
Explain why the carrying of wild animals is higher than that for cattle in a given piece of land.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN06
In what form is oxygen transported from the lungs to the tissues?
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K.C.S.E Biology Q & A - MODEL 2002PP1QN05
State two characters that researchers select in breeding programme.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN04
During germination and early growth, the day weight of the endosperm decreases while that of the embryo increases. Explain.
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K.C.S.E Biology Q & A - MODEL 2002PP1QN03
Give one example of a metallic co – factor
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K.C.S.E Biology Q & A - MODEL 2002PP1QN03
State the function for co-factors in cell metabolism
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K.C.S.E Biology Q & A - MODEL 2002PP1QN02b
Name the bacteria found in the root nodules of leguminous plant
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K.C.S.E Biology Q & A - MODEL 2002PP1QN02a
Name the bacteria found in the root nodules of leguminous plant
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K.C.S.E Biology Q & A - MODEL 2002PP1QN01
Beside the abdomen, name the other body part of members of Arachnida,
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K.C.S.E Biology Q & A - MODEL 2001PP1QN18b
State the change that take place in a flower after fertilization
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K.C.S.E Biology Q & A - MODEL 2001PP1QN18a
Describe the process of fertilization in a flowering plant
answers
pollen grains stick in the stigma surfaces; that surface of stigma producers a chemical substance; which stimulates the pollen grain to produce a pollen tube / germinate. The pollen tube/ germinate. The pollen tube grows down (into the tissues of style) from where it derives nutrients; the generative nucleaus divides to give rise to two male nuclei and the antipodal cells; when pollen tubes disintegrates and make nucleus fuses with the egg cell and forms the zygote. The other male nucleus fuss with the two polar nuclei to form a triploid nucleus. The process involves double fertilization.
K.C.S.E Biology Q & A - MODEL 2001PP1QN17b
Describe how semicircular canals perform their functions
answers
​There are three semi – circular canals; arranged in planes at right angle to each other; at the end of each canal is swelling called ampulla’s which contains receptors.
The movement of the cause movement of the fluid in at least one canal, the fluid movement deflects / displaces the coperta and thus stimulating the receptors / sensory hairs, the impulse / nerve sensory impulse is transmitted / conducted to the brain; by auditory nerve, about the movement of the body / head. K.C.S.E Biology Q & A - MODEL 2001PP1QN17a
State the functions of the following parts of the mammalian ear;
(i) Tympanic membrane (ii) Eustachian tube (iii) Ear ossicles
answers
​ a) i) Tympanic membrane.
Receives sound waves (from the air); and vibrates / transforms sound wave into vibrations to transmit them to the ear osssicles / malleus; acc. Hammer for malleus. ii) Eustachain tube. Equalizes the air pressure in the middle ear to that in the outer ear. iii) Ear ossicles Amplify / transmits vibrations from the tymphanic membrane in the inner ear / venestra ovalis / oval window. |
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