​K.C.S.E Biology Q & A - MODEL 2008PP1QN20
Name the opening to the chamber of the heart of an insect
ANSWER
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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
K.C.S.E Biology Q & A - MODEL 2008PP1QN10
State the adaptation that enables the red blood cells to move in blood Capillaries
ANSWERS
K.C.S.E Biology Q & A - MODEL 2008PP1QN10
Name the antigens that determine human blood groups
ANSWERS
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 2007PP2QN06
Other than sugars name two compounds that are translocated in phloem
answers
K.C.S.E Biology Q & A - MODEL 2007PP2QN06
Name the structures in phloem that are involved in the translocation of sugars
answers
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 2007PP1QN11
State tow ways in which the blood cells are adapted to their function
ANSWERS
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 2006PP1QN07
state three functions of blood other than transport.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN07
Name one defect of circulatory system in humans.
answers
K.C.S.E Biology Q & A - MODEL 2006PP1QN03
How is support attained herbaceous plants?
answer
K.C.S.E Biology Q & A - MODEL 2004PP1QN15
a) Give the differences between the following structures in wind and insect pollinated flowers.
i) Anther ii) Pollen grains iii) Stigma b) What is the importance of cross pollination? c) Explain how a seed is formed after an ovule is fertilized
answers
​(i) anther Insect Wind
Small short anther firmly Large/ long anthers/ loosely attached to Attached to elements filaments (ii) Large heavy/ spiky small/ light/ smooth (iii) Small/ sticky Long feathery (b) Source of variation/ hybrid acc. Production of hybrid K.C.S.E Biology Q & A - MODEL 2004PP1QN13
The diagram below shows a vertical section through a mammalian heart.
​a) Name the parts labeled A,B,E and F
b) Use arrows to show the direction in which blood flows in the heart. c) Give a reason why the wall of chamber C is thicker than chamber D
answers
(a) A Pulmonary vein
B Left atrium I auricle E Tricuspid valve F Pulmonary artery
​(b) The left ventricle ‘C’ pumps blood a longer distance to all parts of the body; while the right ventricle ‘D’ pumps blood to a shorter distance/ to the lungs; therefore the left ventricle has thicker walls to generate exert more pressure.
K.C.S.E Biology Q & A - MODEL 2004PP1QN02
Distinguish between natural and acquired immunity
answers
​K.C.S.E Biology Q & A - MODEL 2003PP1QN19
Describe how fruits and seeds are suited to their modes of dispersal.
answers
Water dispersed fruit / seeds
K.C.S.E Biology Q & A - MODEL 2002PP1QN16
The diagram below represents part of phloem tissue.
​a) Name the structures labeled R and S and the cell labeled T.
R S Cell labeled T b) State the function of the structure labeled S c) Explain why xylem is a mechanical tissue
answers
​(a) R. Sieve pore
S- cytoplasmic strand, cytoplasmic filaments rej. Proto plasmic strand) Cell labeled T (b) Translocation (L is tied with structures) (c) Thickened and lignified.
K.C.S.E Biology Q & A - MODEL 2002PP1QN06
In what form is oxygen transported from the lungs to the tissues?
answers
K.C.S.E Biology Q & A - MODEL 2001PP1QN08b
Name the blood vessel that transports blood from:
(i) Small intestines to the liver (ii) Lungs to the heart
ANSWERS
(i) Hepatic portal vein
(ii) Pulmonary vein A person whose blood groups is AB requires a blood transfusion. Name the blood groups of the donors.16/6/2020
K.C.S.E Biology Q & A - MODEL 2001PP1QN03
A person whose blood groups is AB requires a blood transfusion. Name the blood groups of the donors.
ANSWERS
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