Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN05
what happens when a wilting young plants is well watered
answers
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K.C.S.E Biology Q & A - MODEL 2009PP1QN29
Explain why the rate of transpiration is reduced when humidity is high
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN28
Name a disease that causes thickening and hardening of arteries
answer
K.C.S.E Biology Q & A - MODEL 2009PP1QN28
State three structural differences between arteries and veins in mammals
K.C.S.E Biology Q & A - MODEL 2009PP1QN27
State two ways in which anaerobic respiration is applied in industries
answers
State two ways in which aerenchyma tissues in aquatic plants are adapted to their function23/6/2020
K.C.S.E Biology Q & A - MODEL 2009PP1QN25
State two ways in which aerenchyma tissues in aquatic plants are adapted to their function
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN24
Explain how the following factors determine the daily energy requirement in human:
(a) Age (b) Occupation (c) Sex
answers
(a) Young people are actively/ rapidly growing hence require more energy than older people
(b) Manual workers require more energy than secretary workers (c)Males are more muscular hence require more energy than females
K.C.S.E Biology Q & A - MODEL 2009PP1QN21
Explain what happens in humans when concentration of glucose in the blood decreases below the normal level
answer
K.C.S.E Biology Q & A - MODEL 2009PP1QN17
Explain why plants do not require specialized excretory organs
ANSWERS
Some wastes e.g gases easily diffuse out Waste products are mainly made from carbohydrate and hence are not as harmful as proteineous materials/ waste products are formed slowly / little accumulation of wastes/ plants are leas active/ some waster products ( such as 02 and are usable- recycled; some waste products are store in non- toxic forms in leaves, flowers, fruits and old bark.
K.C.S.E Biology Q & A - MODEL 2009PP1QN16
How is the surface named in (a) above suited to its function
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN16
Name the gaseous exchange surface in insects
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN15
Name the type of movement that occurs within a plant cell
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN14
Name a support tissue in plants that is not thickened with lignin
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN09
Name the disease in humans caused by plasmodium falciparum
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN09
Name the causative agents of the following diseases in humans
(i) Typhoid (ii) Amoebic dysentery
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN06
The diagram below shows a section through a plant organ
(a) (i) Name the class of the plant which the section was obtained
(ii) Give a reason for your answer in (a) (i) above (b) State the functions of the part labeled F
ANSWERS
(a) (i) Dicotyledonous; Rej: Dicotyledonous
(ii) Vascular bundles arranged in a ring / presence of vascular (b) (Divides to) give rise to secondary thickening (growth/ increase in growth/ diameter/ width of stem/ gives rise to new/ additional xylem and phloem tissues
K.C.S.E Biology Q & A - MODEL 2008PP2QN08
Describe the mechanism of gaseous exchange in a mammal
answers
Breathing in
External intercostals muscles contract; internal, intercostals muscles relax lifting/ raising the ribcage upwards and outwards; muscles of diaphragm contract. It flattens the volume of the thoracic cavity increases; pressure decrease; higher air pressure in the atmosphere forces air into the lungs Breathing out External intercostals/ muscles relax; internal intercostals muscles contract moving the ribcage downwards and inwards; the muscles of diaphragm relax, the diaphragm assumes dome shape; volume of thoracic cavity decreases; while pressure increases; higher pressure forces air out of the lungs
K.C.S.E Biology Q & A - MODEL 2008PP2QN08
State four characteristics of gaseous exchange surfaces
answers
K.C.S.E Biology Q & A - MODEL 2008PP2QN06
An experiment was carried out to investigate transpiration and absorption of water in sunflower plants in their natural environment with adequate supply of water. The account of water was determined in two hour intervals. The results are as shown in the table below
​(a) Using the same axes, plot graphs to show transpiration and absorption of water in grammes against time of the day
(b) At what time of the day was the amount of water the same for transpiration and absorption? (c) Account for the shape of graph of: (i) Transpiration (ii) Absorption (d) What would happen to transpiration and absorption of water if the experiment was continued till 05 00 hours? (e) Name two factors that may affect transpiration and absorption at any given time (f) Explain how the factors you named in (e) above affect transpiration
answers
​(b) 17.001- 19.99 hrs
(c) (i) Transpiration 1100 – 17000 (rapid) ( in the rate of transpiration) due to high light intensity/ high temperature (ii) 17000 – 0300 hrs decrease (in the rate of transpiration) due to low light intensity/ absence of light/ in temperature. (iii) Absorption 11.00 – 1900 hrs. Increase (in the rate of atmosphere) of water to replace water lost- through transpiration 1900 – 0300 hrs; decrease ( in the rate of absorption of water) due to the fact that rate of transpiration has declined (d) Both transpiration and absorption decrease accept decrease (e) Wind; light, atmosphere pressure, humidity; temperature Temperature - at high temperature the rate is higher/ at low temperature the rate is Low. (f) Wind- rate of transpiration is high when it’s windy/ lower when air still Humidity – when humidity is low, the rate of transpiration is faster/ when its High the rate of transportation is low Pressure- the rate is high at low atmosphere pressure at high atmosphere pressure the rate is low.
K.C.S.E Biology Q & A - MODEL 2008PP1QN27
Explain how anaerobic respiration is applied in sewage treatment.
answers
K.C.S.E Biology Q & A - MODEL 2008PP1QN26
State one use of each of the following excretory products of plants:
(a) colchicine; (b)pawpaw
answers
(a) Inducing polyploidy/ treatment
(b) Meat tenderizer
​K.C.S.E Biology Q & A - MODEL 2008PP1QN20
Name the opening to the chamber of the heart of an insect
ANSWER
K.C.S.E Biology Q & A - MODEL 2008PP1QN20
Name an organism which has single circulatory system
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN20
what is a single circulatory system
ANSWERS
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