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Question 31
A
Tap water 
B
a very strong sugar solution 
C
a weak sugar solution 
D
a very weak salt solution 
E
distilled water 
Explanation.

When a plant cell is put in highly concentrated solution, it increases the pressure on the cell. Hence, plasmolysis holds in a highly concentrated solution.


Correct Option:
B
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Question 32
A
Cholera 
B
Bilharzia 
C
River blindness 
D
Malaria 
E
Sleeping sickness 
Explanation.

Cholera is a water-borne disease hence, it cannot be contacted by the farmer.


Correct Option:
A
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Question 33
A
pulmonary artery 
B
lungs 
C
Heart 
D
liver 
E
aorta 
Explanation.

Blood circulation holds in the circulatory system, the liver is a part of the digestive system. Hence, the liver can't be a part of the circulation process.


Correct Option:
D
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Question 34
A
Only the tip of the seedling received the light 
B
The light was not strong enough 
C
The seedlings were rather too young 
D
The tip of the seedling may have been covered 
E
The box containing the seedling should have been placed on a laboratory bench 
Explanation.

Plants growing with an unshaded light source will grow straight up towards the sun because auxin is evenly distributed all around the shoot. Plants are able to see light using the tips of the plant shoots.


Correct Option:
A
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Question 35
A
A smaller quantities of sticky pollen produce 
B
Feathery styles of stigmas pendulously hang outrside the flower 
C
small inconspicuous scentless flower 
D
large anthers which are loosley attached to the filament 
E
Light pollen grains produced in large quantities from the anthers 
Explanation.

Wind-pollinated grains are non-sticky and light, to ensure they can be blown by the wind.


Correct Option:
A
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Question 36
A
converting carbonhydrate into glucose 
B
Transporting energy from part of the plant to another 
C
The production of energy by oxidising essential carbonhydrate 
D
hydrolysis of protein 
E
The formation of water molecules within the germinating seed 
Explanation.

Oxygen is needed by plants in order to produce carbondioxide which is useful by the plant.


Correct Option:
C
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Question 38
A
25% wrinkled, 75% round 
B
100% wrinkled 
C
50% wrinkled, 50% round 
D
75% wrinkled, 25% round 
E
100% round 
Explanation.

Owing to the dominance of roundness, the crossing of the two seeds regularly would see all the offsprings having mixed genes but will be round.


Correct Option:
E
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Question 39
A
Grows on moist dead organic matter 
B
Is a plant 
C
Has cellulose cell-wall 
D
Reproduce asexually by producing a spore 
E
Has no chlorophyll 
Explanation.

No official Explanation yet!


Correct Option:
C
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Question 40
A
Excretion 
B
Germination 
C
Transpiration 
D
Digestion 
E
Photosynthesis 
Explanation.

Alkaline pyrogallol absorbs water and oxygen. So it is used in photosynthesis to test for the importance of water as one of the materials necessary for photosynthesis to take place.


Correct Option:
E
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