Mastering KCSE Biology with Comprehensive Topical Questions and Answers
K.C.S.E Biology Q & A - MODEL 2008PP1QN18
How is the epidermis of a leaf of a green plant adapted to its function
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K.C.S.E Biology Q & A - MODEL 2008PP1QN15
Explain what happens when there is oxygen debt in human muscles
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K.C.S.E Biology Q & A - MODEL 2008PP1QN11
Name three processes in the human body in which homeostasis is Involved
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K.C.S.E Biology Q & A - MODEL 2008PP1QN11
What is homeostasis?
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K.C.S.E Biology Q & A - MODEL 2008PP1QN10
State the adaptation that enables the red blood cells to move in blood Capillaries
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K.C.S.E Biology Q & A - MODEL 2008PP1QN10
Name the antigens that determine human blood groups
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K.C.S.E Biology Q & A - MODEL 2008PP1QN09
Give three factors that determine the amount of energy a human being require in a day
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K.C.S.E Biology Q & A - MODEL 2008PP1QN04
The diagrams below show a red blood cell that was subjected to a certain Treatment
(a) Account for shape of the cell at the end of the experiment
(b) Draw a diagram to illustrate how a plant cell would appear if subjected to the same treatment K.C.S.E Biology Q & A - MODEL 2008PP1QN02
State the importance of the following processes that take place in the nephrons of a human kidney
(a) Ultra filtration (b) Selective reabsorption
ANSWERS
(a) To remove toxic/ harmful substances/ urea nitrogenous waste from the blood streams
(b) To return useful substances/ glucose and Amino acids loose into the Bloodstream. K.C.S.E Biology Q & A - MODEL 2008PP1QN01
Name the tissues in plants responsible for:
(a) Transport of water and mineral salts (b) Transport of carbohydrates (c) Primary growth
ANSWERS
(a) xylem
(b) Phloem (c) Apical meristems
K.C.S.E Biology Q & A - MODEL 2007PP2QN06
Other than sugars name two compounds that are translocated in phloem
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K.C.S.E Biology Q & A - MODEL 2007PP2QN06
Name the structures in phloem that are involved in the translocation of sugars
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K.C.S.E Biology Q & A - MODEL 2007PP2QN06
In the experiment to determine the effect of ringing on the concentration of sugar in phloem a ring of bark from the stem of a tree was cut and removed. The amount of sugar in grammes per 16cm3 piece of bark above the ring was measured over a 24 hour period. Sugar was also measured in the bark of a similar stem of a tree which was not ringed. The results are shown in the table below.
(a) Using the same axes, plot a graph of the amount of sugar against time
(b) At what time was the amount of sugar highest in the (i) Ringed stem (ii) Normal stem? (c) How much sugar would be in the ringed stem if it was measured at 0345hours? (d) Give reasons why there was sugar in the stems of both trees at 06 45 hours (e) Account for the shape of the graph for the tree with ringed stem between: (i) 06 45 hours and 15 45 hours (ii) 15 45 hours and 00 45 hours
answers
(b)(i) 15: 45
(ii) 12:45 (c) 0.79 + 0.02 grammes (d) The food that had been manufactured the previous day had been converted to soluble sugars and was being translocated to other parts of the plant. (e)0645 hours and 15 45 hours There was low concentration of sugars early in the morning as there was little translocation As day progresses the light intensity increases and more food is manufacture thus more translocation increasing concentration of sugars (ii)15 45 hours and 0045 hours The light intensity is decreasing reducing rate of photosynthesis. Less food is manufactured hence less is translocation As it turns dark there is no photosynthesis reducing concentration of sugars translocated.
K.C.S.E Biology Q & A - MODEL 2007PP2QN02
What term is given to the condition described in (c) (i) above
answer
K.C.S.E Biology Q & A - MODEL 2007PP2QN02
What would happen if a person produced less antidiuretic hormone?
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K.C.S.E Biology Q & A - MODEL 2007PP2QN02
Which portion of the human nephron are only found in the cortex?
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K.C.S.E Biology Q & A - MODEL 2007PP2QN02.
Explain what happens to excess amino- acids in the liver of humans
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K.C.S.E Biology Q & A - MODEL 2007PP1QN14
Name the hormones involved in regulating glucose level in blood
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K.C.S.E Biology Q & A - MODEL 2007PP1QN13
What is oxygen debt?
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K.C.S.E Biology Q & A - MODEL 2007PP1QN13
Name the products of anaerobic respiration in
(i) Plants (ii) Animals
ANSWERS
(i) Ethanol and carbon (iv) oxide
(ii) Lactic acid
K.C.S.E Biology Q & A - MODEL 2007PP1QN12
Name two structures for gaseous exchange in aquatic plants
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K.C.S.E Biology Q & A - MODEL 2007PP1QN11
State tow ways in which the blood cells are adapted to their function
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K.C.S.E Biology Q & A - MODEL 2007PP1QN11
What prevents blood in veins from flowing backwards?
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K.C.S.E Biology Q & A - MODEL 2007PP1QN09
State two ways in which the root hairs are adapted to their function
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K.C.S.E Biology Q & A - MODEL 2006PP2QN08
Describe how water moves from the soil to the leaves in a tree.
answers
​Water exists as a thin film in the soil between soil particles. The concentration cell sap is greater than that of the surrounding solution in the soil; Thus drawing water molecules across the cell wall and membrane into the root hair cells; by osmosis; water drawn into the root hair cell dilutes the cell sap/ makes it less concentration than that in the adjacent cell into the cortex cells. (By osmosis); across the endosperm by active transport; into the xylem vessels (of the root); Then conduct the water up into the xylem (vessels) of the stem; into xylem of leaves. Water is pushed/ rises up the stem by root pressure ( in the xylem vessels) water would rise by capillary; cohesion, and adhesive forces; water moves as a continuous an uninterrupted water column in the xylem (vessel) up the tree to the leaves. As water vaporizes from the spongy mesophyll cells; their cells sap becomes more concentrated than adjacent water flows into the cells from other surroundings cells; which in turn takes in water from xylem vessels within the leaf veins. This creates a pull / suction force/ transpiration pull that pulls a stream of water from xylem vessel in the stem and roots; the transpiration pull maintains continuous column of water from the roots into the leaves (transpiration stream).
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