Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN22
State the function of ciliary muscles in the human eye.
answer
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K.C.S.E Biology Q & A - MODEL 2006PP1QN21
The diagram below represents a reflex are in human.
​a) Name the parts labeled X and Y
b) Name the substance that is responsible for the transmission of an impulse across the synapse.
answers
​(a) X- motor neurone- accept of motor neurone rej. Axon alone
Y- Sense organ/ receptor (b) Acetyl; chlorine/ noradrenaline ( Nerepinephrine)
K.C.S.E Biology Q & A - MODEL 2006PP1QN20
State three biological importance of tropisms plants.
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K.C.S.E Biology Q & A - MODEL 2006PP1QN20
What name is given to response to contact with surface exhibited by tendrils and climbing stems in plants?
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K.C.S.E Biology Q & A - MODEL 2006PP1QN19
Give three advantages of cross pollination.
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K.C.S.E Biology Q & A - MODEL 2006PP1QN19
a) Explain how the following prevent self pollination.
(i) Protoadry (ii) Self – sterility.
answers
(i) Protoandry – Male reproduction organ/ anthers androecia/ stamens mature earlier than female reproduction organ/ carpels/ stigma/ pistil/ gynoecium.
(ii) Self sterility- pollen grains are sterile to stigma of some plants/ flowers
K.C.S.E Biology Q & A - MODEL 2006PP1QN18
How does substrate concentration affect the rate of enzyme action?
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN18
State two functions of bile juice in the digestion of food.
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K.C.S.E Biology Q & A - MODEL 2006PP1QN17
A certain animal has no incisors, no canines, 6 premolars and 6 Molars in its upper jaw. In the lower jaw there are 6 incisors, 2 canines, 6 Premolars and six molars. Write its dental formula.
K.C.S.E Biology Q & A - MODEL 2006PP1QN17
What is the function of carnassials teeth?
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN17
Distinguish between the terms homodont and heterodont.
answers
​Homodont – having same kind/ type/ similar teeth.while Heterodont – having different type kind of teeth
K.C.S.E Biology Q & A - MODEL 2006PP1QN16
What is the importance of the following in an ecosystem?
a) Decomposers b) Predation
answers
(a) Decomposer – recycling of nutrients
(b) Predation – regulation of numbers/ population
K.C.S.E Biology Q & A - MODEL 2006PP1QN15
Explain continental drift as an evidence of evolution.
answers
​Current continents existed as one large land mass/ Pingea/ Laureshia Guondaland; the present continent drifted leading to isolation of organisms; organism in each continent evolved along different lines hence emergence of new species,
K.C.S.E Biology Q & A - MODEL 2006PP1QN14
Why is oxygen necessary in the germination of seeds?
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN14
Distinguish between epigeal and hypogeal germination.
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K.C.S.E Biology Q & A - MODEL 2006PP1QN13
State the economic important of anaerobic respiration in plants.
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K.C.S.E Biology Q & A - MODEL 2006PP1QN13
In what form is energy stored in muscles
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN12
An experiment was set up in the experiment as show below.
The set up was left for 30 minutes.
a) State the expected results. b) Explain your answer in (a) above
answers
​(a) Visking tubing will become turgid; accept will increase in volume / bulges/ swells/ becomes bigger/ expands.
(b) Sucrose solution is hypertonic/ water is hypotonic; water moves from beaker into visking tube by osmosis though semi permeable visking tubing, making visking tubing turgid. Or water moves from beaker into visking tubing by osmosis, through semi permeable visking tubing; with hypertonic solution.
K.C.S.E Biology Q & A - MODEL 2006PP1QN11
State the role of insulin in human body.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN10
State the important of tactic response among some members of kingdom protista.
answer
K.C.S.E Biology Q & A - MODEL 2006PP1QN09
What is significance of meiosis?
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K.C.S.E Biology Q & A - MODEL 2006PP1QN09
State two processes which occur during anaphase of mitosis.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN08
State the role of vitamin C in humans.
answers
​Prevents scurvy/ prevent bleeding of gums/ prevent bleeding of gums/ Prevents poor healing of wounds/ prevent degeneration of muscle and cartilages/ prevent red spot on skin/ prevent anemia
Excretion absorption of iron Enables absorption of iron Boost immunity Development of healthy gums Synthesis/ maintenance of collagen fibres/ connective
K.C.S.E Biology Q & A - MODEL 2006PP1QN07
state three functions of blood other than transport.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN07
Name one defect of circulatory system in humans.
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