Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN15
A potted plant was kept in the dark for 48 hours, Two leaves X and Y were treated as shown in the diagram below.
The experimental set-up was kept in sunlight for 6 hours after which a starch test was carried out on the two leaves. .
(a) What were the results of the starch test on leaves X and Y’? X Y (b) Give reasons for your answers in (a) above.
answers
a) X — Starch present;
Y-Starch absent; b) X - Acts as a control; Y - CO2 absent absorbed by potassium hydroxide pellets;
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Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove.24/6/2020
K.C.S.E Biology Q & A - MODEL 2010PP1QN14
Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove.
answer
K.C.S.E Biology Q & A - MODEL 2010PP1QN13
What is meant by the following terms?
(a) Habitat; (b) Ecosystem.
answers
(a) Place or environment in which specified organisms live;
(b) A natural unit with abiotic and biotic factors; K.C.S.E Biology Q & A - MODEL 2010PP1QN12
The diagram below illustrates the structure of bread mould.
(a) Name the part labelled J.
J K (b) State the functions of the structure labelled K.
answers
(a) J – sporangium
K-Rhizoids (b)- Absorption of soluble substances/ digested food - Secretion of digestive enzymes; - Anchorage(of mould on substrate); K.C.S.E Biology Q & A - MODEL 2010PP1QN11
The diagram below shows a transverse section of a leaf.
(a) Name the habitat of the plant from which the leaf was obtained.
(b) Give two reasons for your answer in (a) above.
answers
(a) Aquatic;
(b) Large air space/aerenchyma to enhance transpiration; Sclereids for mechanical support of leaf; Stomata on upper epidermis to enhance transpiration:
K.C.S.E Biology Q & A - MODEL 2010PP1QN10
State two advantages of hybrid vigour.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN09
State two ways in which chloroplasts are adapted to their function.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN08
State three external differences between chilopoda and diplopoda.
K.C.S.E Biology Q & A - MODEL 2010PP1QN07
Distinguish between haemolysis and plasmolysis.
answers
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 2010PP1QN05
State three ways in which a respiratory surface is adapted to its function.
answers
K.C.S.E Biology Q & A - MODEL 2010PP1QN04
The diagram below shows a specialized plant cell.
(a) (i) Name the cell.
(ii) Name the parts labelled D and E. D E (b) State the function of the part labelled C.
answers
(a)(i) Root hair cell;
(ii) D—cell wall; E — cellsap vacuole; (b) Controls the functioning of the cell; K.C.S.E Biology Q & A - MODEL 2010PP1QN03
State the functions of:
(a) Ribosomes; (b) Lysosomes.
answers
(a) Protein synthesis
(b) Destroys worn out organdies and micro-organism; K.C.S.E Biology Q & A - MODEL 2010PP1QN02
The diagram below shows a transverse section of a plant organ.
(a) Name the plant organ from which the section was obtained.
(b) (i) Name the class to which the plant organ was obtained. (ii) Give a reason for your answer in (b)(i) above. (c) Name the part labelled X.
answers
(a) Stem:
(b) (i) Monocotyledonae; (ii) Vascular bundles scattered/not arranged in a ring (c) Epidermis; K.C.S.E Biology Q & A - MODEL 2010PP1QN01
State the name given to the study of:
(a) the cell; (b) microorganisms.
answers
(a) Cytology;
(b) Microbiology;
K.C.S.E Biology Q & A - MODEL 2009PP2QN08
Describe the role of the liver in homeostasis in the human body
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN07
How are flowers adapted to wind and insect pollination?
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN06
An experiment was carried out to investigate the effect of temperature on the rate of reaction catalyzed by an enzyme. The results are shown in the table below
(a)On t he grid provided draw a graph of rate of reaction against temperature
(b) When was the rate of reaction 2.6 mg of product per unit time? (c) Account for the shape of the graph between (i) 5 C and 40 C (ii) 45 C and 60C (d) Other than temperature name two ways in which the rate of reaction between 5C and 40C could be increased (e) (i) Name one digestive enzymes in the human body which works best in acidic condition (ii) How is the acidic condition for the enzyme named in (e) (i) above attained? (f) The acidic conditions in (e) (ii) above is later neutralized (i) Where does the neutralization take place? (ii) Name the substance responsible for neutralization
answers
​(b) 33C and 51.5 ( ± 0.5C)
32.5 - 33.5 and 51.0 – 52.0 (c)(i) As temperature is increased rate of reaction is increased/ more products are formed (per unit time) because enzymes become more active (ii) As temperatures increases rate of reaction decreases less products are formed (unit per time) because enzymes become denatured by high temperatures. (b) Increase in enzyme concentration and substance concentration Increasing number of enzyme (e) (i) Pepsin, remain/ chymosin (ii) Wall of stomach/ gastric gland/ oxyntic/ pariental/ cell produced Hydrochloric (f) (i) Duodenum (ii) Bile juice/ SANS any correct salt e.g. NaHCO3
K.C.S.E Biology Q & A - MODEL 2009PP2QN05
Give three functions of pectoral and pelvic fins in a fish
answers
​ - Steering
- Balance - Braking, changing direction - Prevent fish from pitching/ up & down movement K.C.S.E Biology Q & A - MODEL 2009PP2QN05
Name a support tissue in plants thickened with
(i) Cellulose (ii) Lignin
answers
(i) Collencyma
(ii) Xylem/ tracheid/ vessels/ schlerencyma
K.C.S.E Biology Q & A - MODEL 2009PP2QN05
what happens when a wilting young plants is well watered
answers
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
Name a substance that is responsible for acid rain
answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN03
What are the effects of eutrophication
answers
​( Proliferation of plants) block light from reaching plants underneath which will not photosynthesize the plants die and decompose leading to lack/ depletion of O2; animals also die/ suffocate.
K.C.S.E Biology Q & A - MODEL 2009PP2QN03
What is eutrophication?
answer
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