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K.C.S.E Biology Q & A - MODEL 2019PP1QN25

2/7/2020

Comments

 

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 
Picture
answers
​(a) spindle shape
Lack striations/ not striated
Uninucleated /one nucleus
 
(b)       striated;
Numerous mitochondrion;
Multinucleated/many nucleus
Cylindrical shaped.
Comments

Explain the evolutionary basis for the ever changing drugs for malaria treatment.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN24

Explain the evolutionary basis for the ever changing drugs for malaria treatment.

Picture
answers
  •  malaria causing parasite over time become resistant to some malaria drugs; due to (gradually changing their genetic constitutions) mutation; which with time result in the evolution and eventual, perpetuation of the new strains of parasite hence necessitating the discovery of a more effective drug to counter the new/ emerging strains;
Comments

Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.

2/7/2020

Comments

 
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.

Picture
answers
​(a) they can interbreed; because they belong to the same genus;
They cannot interbreed; because they do not belong to the same species.
Comments

State three homeostatic roles of the liver.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN23

State three homeostatic roles of the liver.

Picture
answers
  • Thermoregulation;
  • Blood sugar regulation
  • Protein/amino acid/fat regulation
Comments

K.C.S.E Biology Q & A - MODEL 2019PP1QN22

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN22

The chart below illustrates how respiratory gases are transported in the human blood.
Picture
​(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
Comments

Make a diagram of a simple, bibbed leaf with a serrated margin.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN21

Make a diagram of a simple, bibbed leaf with a serrated margin.

Picture
answers
Picture
Comments

K.C.S.E Biology Q & A - MODEL 2019PP1QN20

2/7/2020

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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 
Picture
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.;
Comments

K.C.S.E Biology Q & A - MODEL 2019PP1QN19

2/7/2020

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K.C.S.E Biology Q & A - MODEL 2019PP1QN19

 Below is a diagram of the human digestive system.
Picture
​(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. 
answers
Picture
(b) Endocrine function/secrets (insulin/ glucagon) hormones; responsible for blood sugar regulation;
Comments

Name the type of tooth in carnivores mainly used for piercing and killing of preys.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN18

Name the type of tooth in carnivores mainly used for piercing and killing of preys.

Picture
answers
  •  canine acc. canines
Comments

K.C.S.E Biology Q & A - MODEL 2019PP1QN17

2/7/2020

Comments

 

K.C.S.E Biology Q & A - MODEL 2019PP1QN17

Below are photographs of two dogs.
Picture
​Explain the possible reason for the difference in the length of their fur.
answers
  • Geographical distribution; made the animals adapt to survive in their environments(cold/hot), with those having thick fur being adapted to cold regions (for insulation); acc. Converse animal with short fur to adopt to hot area.
  • Genetic/being passed from parents to offspring's/genetic inheritance / genes being passed from parents to offspring;
Comments

State two benefits of mutation in living organisms.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN16

State two benefits of mutation in living organisms.

Picture
answers
  • Can bring about beneficial/advantageous traits/polyploidy in plants/resistance to diseases/ high yields/early maturity/resistance to malaria in sickle celled traits in animals;
  • Increases heterozygosity (and size of gene pool) increase variation; â€‹
Comments

State the significance of transpiration to a plant.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN15

State the significance of transpiration to a plant.

Picture
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
Comments

Distinguish between guttation and transpiration.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN15

Distinguish between guttation and transpiration.

Picture
answers
Comments

Name the evidence of organic evolution exhibited by occurrence of similar amino acid molecules in a range of organisms.

2/7/2020

Comments

 
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.

Picture
answers
(b) comparative physiology/ biochemistry/cell biology;
Acc. Serology /comparative serology.
Comments

Explain why fossil records as evidence of organic evolution are usually incomplete.

2/7/2020

Comments

 
K.C.S.E Biology Q & A - MODEL 2019PP1QN14

Explain why fossil records as evidence of organic evolution are usually incomplete.

Picture
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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