K.C.S.E Biology Q & A - MODEL 2018PP1QN25
Desert kangaroo rats spend most of their time in underground burrows,
(a) Name this type of behavioral activity (b) Explain the significance of this behaviour to the organism.
answers
​(a) Aestivation;
(b) Reduced metabolic activity; hence low rate of respiration; minimizing water loss/dessication (to the environment);
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K.C.S.E Biology Q & A - MODEL 2018PP1QN24
Explain why a camel has a longer nephron than a whale.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN23
State two characteristics of living things illustrated in the photograph below.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN22
What does the term evolution mean?
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN21
State two ways in which plants with weak stems obtain mechanical support.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN20
Give two illustrations of analogous structures in mammals.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN20
Define the term analogous structures.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN19
The diagrams below illustrate some forms of beaks in birds.
​(a) Which diagram represents the beak from which the others are likely to have evolved?
(b) Explain your answer in (a) above.
answers
​ (a) Beak M
(b) Beak M is simple/basic; original beak; the birds separated to occupy different niches; and specialized for different diets; leading to more complex/developed beaks over time; K.C.S.E Biology Q & A - MODEL 2018PP1QN18
​A tall, light skinned lady with pimples on her face has long hair and limps.
(a) List two features which the lady has that are due to inheritance.
(b) Explain why most recessive genes are expressed phenotypically in male offspring of humans.
answers
​(a) Height (tallness);
Long hair; Skin colour (light); (b) Most of the genes are sex-linked and are carried on the X - chromosomes; boys receive X chromosomes from the mother (and Y chromosomes from the father); if the X carries a recessive gene, it is more likely to be phenotypically expressed in boys;
K.C.S.E Biology Q & A - MODEL 2018PP1QN17
Explain the role of carbonic anhydrase in red blood cells.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN16
Name the bones that articulate to form a ball and socket joint at the hip.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN15
Explain why a bony fish dies shortly after being removed from water.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN14
The diagram below illustrates a germinating seedling.
​(a) Name the type of germination illustrated in the diagram
(b) Describe how the type of germination named in (a) above is brought about.
answers
​(a) Epigeal;
(b) Hypocotyl elongates faster than the epicotyl; pushing cotyledons above the ground;
K.C.S.E Biology Q & A - MODEL 2018PP1QN13
State two limitations of using a quadrat to estimate the population of organisms.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2018PP1QN11
Name three structures of the skin essential for its homeostatic function.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2018PP1QN11
State one homeostatic role of the human skin.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2018PP1QN10
Name two products of respiration in plants.
ANSWERS
K.C.S.E Biology Q & A - MODEL 2018PP1QN09
The diagram below represents an organ in a bony fish
​(a) Name the organ.
(b) Describe how air in water reach the capillaries inside structure L.
ANSWERS
a) Gill;
b) Fish mouth opens lowering pressure in buccal cavity and water rushes in; mouth closes increasing pressure that forces water into the gill cavity/opercular cavity; O2 rich water flows over the gills in a counter current direction to capillary blood flow; causing O2 to diffuse into the gill capillaries;
K.C.S.E Biology Q & A - MODEL 2018PP1QN07
State three activities in the human digestive System that depend on respiration.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN07
Define respiration
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN06
The diagram below illustrates tissue fluid and cells surrounding a capillary.
​(i)Name fluid G.
(ii) Give two ways by which fluid G is different from tissue fluid.
answers
(i) (Blood) plasma;
(ii) Has (more large) proteins/blood platelets; High (hydrostatic) pressure/low pressure of tissue fluid; Has red blood cells;
K.C.S.E Biology Q & A - MODEL 2018PP1QN05
State why it is important for plants to lose water to the atmosphere.
answers
K.C.S.E Biology Q & A - MODEL 2018PP1QN04
A group of form two students placed a fresh leaf in warm water. They observed that air bubbles formed on the surface of the leaf.
(a) What biological process were they investigating? (b) Name the structures from which the air bubbles were coming from. (c) Explain the distribution of the structures named in (b) above on the leaf surfaces of a land plant.
answers
​a) Photosynthesis;/gaseous exchange in plants;
b) Stoma/somata; c) Are more on the lower surface of terrestrial plants/fewer on the upper surface; to reduce transpiration;
K.C.S.E Biology Q & A - MODEL 2018PP1QN03
Which sets of teeth would be used in chewing sugarcane for maximum extraction of sap?
answers
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