Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2009PP2QN03
Give an example of biological control
answers
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K.C.S.E Biology Q & A - MODEL 2009PP2QN02
Name the substance that is responsible for hardening of teeth
answer
K.C.S.E Biology Q & A - MODEL 2009PP2QN02
The diagram below represents the lower jaw of a mammal
(a) Name the mode of nutrition of the mammal whose jaw is shown
(b) State one structural and one functional difference between the teeth labeled J and L Structural Functional (c) (i) name the toothless gap labeled K.
answers
(a) Herbivorous Rej Herbivore Acc Herbivory
(b) Tooth J is narrow/ sharp/ chisel like while tooth L is broad/ ridged J has one root while L has 2/3/4 roots Functional Tooth J is used for cutting while tooth L is used for grinding cutting for biting) (c) (i) Diastema (ii) For manipulation of blood by tongue K.C.S.E Biology Q & A - MODEL 2009PP2QN01
When the offspring of purple and white flowered pea plants were crossed, they produced purple and white flowered plants in the ratio of 3: 1 Using letter H to represent the gene for purple colour
(a) State the genotype of: (i) Parents (ii) F1 Generation (b) Work out the cross between plants in the F1 generation (c) Account for the colour the flowers in plants of the F1 generation
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
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. |
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