Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN28
State three structural differences between arteries and veins in mammals
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K.C.S.E Biology Q & A - MODEL 2009PP1QN27
State two ways in which anaerobic respiration is applied in industries
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN26
How are the mitochondria adapted to their functions?
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 2009PP1QN23
state the function of iron in the human body
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN22
Explain how the carnassials teeth of a dog are adapted to their function
answer
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 2009PP1QN20
Other than using the quadratic, give two methods of estimating population of grass
answers
Name one process that is responsible for loss of energy from one trophic level to the next23/6/2020
K.C.S.E Biology Q & A - MODEL 2009PP1QN19
Name one process that is responsible for loss of energy from one trophic level to the next
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN19
State three effects of dumping untreated sewage into a river
answers
K.C.S.E Biology Q & A - MODEL 2009PP1QN18
Explain how the following factors affect the rate of photosynthesis:
(a) Concentration of carbon (iv) oxide (b) Light intensity
ANSWERS
​(a) Rate of photosynthesis increases as CO2 concentration increases up to a certain level/ optimum level and ( vise versa)Reverse:
b)The rate of photosynthesis decreases with decrease in CO2 concentration until it stop rate of photosynthesis increases as the light intensity up to an optimum level (and vice versa)
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 2009PP1QN13
State one role that is played by osmosis in
(i) Plants (ii) Animals
ANSWERS
(i) absorption of water from the soil by root hair cells/ movement of water between plant cells/ from cell to cell/ opening one closing of stomata/ support in herbaceous plants due to turgidity / feeding in insectivorous plant.
(ii) Water reabsorption by blood capillaries from renal tubules/ absorption of water in colour dicututary/ canal/ gut movement of water from cell to cell in animals.
K.C.S.E Biology Q & A - MODEL 2009PP1QN13
Distinguish between diffusion and active transport
ANSWER
In diffusion molecules move from a highly conc. Region to a lowly conc. Region while in active transport molecules move from a lowly concentration region to a highly concentration region; on diffusion molecules move along conc. gradient while in active transport molecules move against conc. gradient. No energy is required in diffusion while energy is required in active transport/ active requires carrier molecules while carrier molecule not required in diffusion;
K.C.S.E Biology Q & A - MODEL 2009PP1QN12
The diagram below represents a bone obtained from a mammal
​(a) Name the bone
(b) Name the: (i) Bone which articulate with the bone named in (a) above at the cavity labeled K; (ii) Joint formed by the two bones (c) State the function of the part labeled J
ANSWERS
(a) scapula;
(b) (i) Humerus (ii) Ball and socket joint (c) Attachment of muscles K.C.S.E Biology Q & A - MODEL 2009PP1QN11
In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below
​(a) State the expected results after 2 weeks
(b) Give a reason for your answer in (a) above
ANSWERS
(a) auxiliary/ lateral buds spront/ bronches will be formed
(b) Decapitation removes the hormone/ ouxins /IAA which is produced in the terminal bud/ the stem tip; abseul/ removal of the hormone/ auxins/ IAA promote branch/ development of auxiliary lateral buds.
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Explain why certain drugs become ineffective in curing a disease after many years of use.
ANSWER
K.C.S.E Biology Q & A - MODEL 2009PP1QN10
Give an example of a vestigial structure in human
ANSWERS
K.C.S.E Biology Q & A - MODEL 2009PP1QN09
Name the disease in humans caused by plasmodium falciparum
ANSWER
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