Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2008PP1QN24
Name the sites where light and dark reactions of photosynthesis take place
Light reaction Dark reaction
ANSWERS
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K.C.S.E Biology Q & A - MODEL 2008PP1QN23
The diagram below shows a human tooth
(a) Identify the tooth
(b) How is the tooth adapted to its function (c) State the role of the following vitamins in the human body (i) C (ii) K
ANSWERS
(a) Canine
(b) Pointed/ sharp for piercing/ tearing/ cutting food (c) (i) C- Absorption of lien/ prevent scurvy/ quick healing of wounds/ best immunity/ ant oxidants/ prevents anaemia/ formation of connective tissues/ ​ K – blood clothing K.C.S.E Biology Q & A - MODEL 2008PP1QN19
The diagram below represents a tissue obtained from an animal
(a) Identify the tissue
(b) State the functions of the tissue named ( a) above
ANSWERS
(a) Cardiac muscle
(b) Contraction of the heart K.C.S.E Biology Q & A - MODEL 2008PP1QN16
The diagram below represents a set up that was used to investigate certain process in a plant
(a) State the process that was being investigated
(b) State a factor that would affect the process
ANSWERS
(a) Photosynthesis
(b) Carbon (iv) Oxide/ Temp/ chlorophyll
K.C.S.E Biology Q & A - MODEL 2008PP1QN12
State two functions of the endoplasmic reticulum
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN05
(a) State two factors that affect enzymatic activities
(b) Explain how one of the factors stated in (a) above affects enzymatic Activities
ANSWERS
​(a) Temperature PH co- factors, co- enzymes; enzyme product concentration; substance concentration/ metabolic poison
(b) Temperature- increase in temperature increases rate of enzymatic activity upto an optimum/ low temperature increases enzymatic activity/ too high temp about optimum point denatures enzymes/ enzymatic activity occur at optimum temp. Ph- Enzymes work best at optimum ph/ or extreme for ph denatures enzymes. Enzyme con – Increase in con increase enzymatic activity occur at optimum temperature Co- enzymes – denatures enzymes increasing rate of activity Strate/ enzyme cone- increase in concentration increase enzymatic activity upto certain level. K.C.S.E Biology Q & A - MODEL 2008PP1QN03
State the causative agent of:
(i) Cholera (ii) Candidiasis
ANSWERS
(i) Vibria chlerae
(ii) Canida/ candida albinism
K.C.S.E Biology Q & A - MODEL 2008PP1QN03
Name a disease of the liver whose symptom is jaundice
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP2QN01
Give the scientific name of the organism that causes tuberculosis in humans
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP2QN01
The diagram below represents some gaseous exchange structures in humans
​(a) Name the structures labeled K, L, and M
K……………………………………………………………………………. L……………………………………………………………………………. M…………………………………………………………………………… (b) How is the structure labeled J suited to its function? (c) Name the process by which inhaled air moves from the structure labeled L into blood capillaries
ANSWERS
​( a) K- Pleural membranes
L- Alveolus M- Intercostal muscles (b) Has c- shaped cartilage rings that support it preventing it from collapsing and allow free flow of air Inner lining has secreting cells that trap fine dust particles and micro- organisms Inner lining has hair like structures called cilia that enhance upward movement of the mucus to the larynx (c) Diffusion
K.C.S.E Biology Q & A - MODEL 2007PP1QN26
State one way by which HIV/AIDS is transmitted from mother to child
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN25
Name the features that increase the surface area of small intestines
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN25
State a factor that denatures enzymes
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN25
The action of ptyalin stops at the stomach. Explain
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN10
The diagram below represents a plant tissue
​(a) Name the tissue
(b) Name the cells labeled K and L. K………………………………………………………………………. L………………………………………………………………………. (c) What is the function of the companion cell?
ANSWERS
​(a) Phloem tissues
(b) K- companion cell L – sieve tube (c) Supply nutrients and energy to the sieve tubes
K.C.S.E Biology Q & A - MODEL 2007PP1QN08
State two functions of potassium in the human body
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN08
Name a fat soluble vitamin manufactured by the human body
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN07
The diagram below represents a section though a human tooth
​(a) (i) Name the type of tooth shown
(ii) Give a reason for your answer in (a) (i) above (b) State the functions of the structures found in part labeled J
ANSWERS
(a) (i) Pre- molar tooth
(ii) presence of two roots (iii)Presence of cusps of the crown (b) Has nerve cells that increase sensitivity of the tooth to heat and pain Has a blood vessel that provides nourishment to the tooth and remove waste products
K.C.S.E Biology Q & A - MODEL 2007PP1QN06
Describe what happens during the light stage of photosynthesis
ANSWER
K.C.S.E Biology Q & A - MODEL 2007PP1QN04
State three functions of Golgi apparatus
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN03
Plant cells do not burst when immersed in distilled water. Explain
ANSWERS
K.C.S.E Biology Q & A - MODEL 2007PP1QN02
Give a reason why staining is necessary when preparing specimens for observation under the microscope
ANSWER
What is the formula for calculating linear magnification of a specimen when using a hand lens?21/6/2020
K.C.S.E Biology Q & A - MODEL 2007PP1QN02
What is the formula for calculating linear magnification of a specimen when using a hand lens?
K.C.S.E Biology Q & A - MODEL 2007PP1QN01
Give two reasons why classification is important
ANSWERS
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