K.C.S.E Biology Q & A - MODEL 2019PP1QN25
State one characteristic of muscles responsible for each of the following:
(a) peristaltic movement (b) movement of limbs
answers
​(a) spindle shape
Lack striations/ not striated Uninucleated /one nucleus (b) striated; Numerous mitochondrion; Multinucleated/many nucleus Cylindrical shaped.
K.C.S.E Biology Q & A - MODEL 2019PP1QN24
Explain the evolutionary basis for the ever changing drugs for malaria treatment.
answers
K.C.S.E Biology Q & A - MODEL 2019PP1QN24
Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.
answers
​(a) they can interbreed; because they belong to the same genus;
They cannot interbreed; because they do not belong to the same species.
K.C.S.E Biology Q & A - MODEL 2019PP1QN23
State three homeostatic roles of the liver.
answers
K.C.S.E Biology Q & A - MODEL 2019PP1QN22
The chart below illustrates how respiratory gases are transported in the human blood.
​(a) Identify gas Q.
(b) Explain the advantage oxyhaemoglobin has over carboxyhaemoglobin.
answers
(a) carbon(ii) oxide acc. CO
(b) Oxyhaemoglobin is unstable/fully dissociate, releasing oxygen to the tissues/dissociate giving haemoglobin free to take up more gaseous molecules(hence constantly supplying the much needed oxygen to the respiratory tissues); carboxyhaemoglobin is stable/binds itself on the haemoglobin molecules /does not dissociate ,hence starving the tissues/cells of the oxygen ,leading to suffocation/death
K.C.S.E Biology Q & A - MODEL 2019PP1QN21
Make a diagram of a simple, bibbed leaf with a serrated margin.K.C.S.E Biology Q & A - MODEL 2019PP1QN20
State how each of the following features enhance efficient movement of fish in water:
(a) Scale (b) body shape
answers
​(a) faces towards the back/overlap/points backwards to provide a smooth surface for easier movement in water/are stony/ covered with mucus for easier /smooth movement in water/ reduce friction making
(b) streamlined body shape to reduce friction / pointed(stuff) head for easier penetration / passage in water.; K.C.S.E Biology Q & A - MODEL 2019PP1QN19
Below is a diagram of the human digestive system.
​(a) Label with Y on the diagram where enzyme amylase is produced.
(b) Besides the digestive role, explain one other function of the part labelled H.
K.C.S.E Biology Q & A - MODEL 2019PP1QN18
Name the type of tooth in carnivores mainly used for piercing and killing of preys.
answers
K.C.S.E Biology Q & A - MODEL 2019PP1QN17
Below are photographs of two dogs.
​Explain the possible reason for the difference in the length of their fur.
answers
K.C.S.E Biology Q & A - MODEL 2019PP1QN16
State two benefits of mutation in living organisms.
answers
K.C.S.E Biology Q & A - MODEL 2019PP1QN15
State the significance of transpiration to a plant.
answers
(b) enable the plant to get rid of excess water
Creates a suction force /help in the uptake of water /mineral/salts from the soil Maintains turgor in plants/turgidity in cells Cools the plant
K.C.S.E Biology Q & A - MODEL 2019PP1QN14
Name the evidence of organic evolution exhibited by occurrence of similar amino acid molecules in a range of organisms.
answers
(b) comparative physiology/ biochemistry/cell biology;
Acc. Serology /comparative serology.
K.C.S.E Biology Q & A - MODEL 2019PP1QN14
Explain why fossil records as evidence of organic evolution are usually incomplete.
answers
(a) partial/ entire decomposition of dead organisms/ organic matter;
Some parts of or entire dead organisms are eaten by scavengers; Soft bodied organisms do not fertilize; Destruction of parts due to natural disasters, like earthquakes/earth movements like, faulting /folding/ volcanicity/ mass movement; Distortion of parts of an organism due to sedimentary/ faulting/folding/volcanic |
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