Biology | Study Mode

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Question 51
A
gum 
B
pulp cavity 
C
cement 
D
enarmel 
Explanation.

The pulp is the part in the center of a tooth made up of living connective tissue and cells called odontoblasts.


Correct Option:
B
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Question 52
A
neutralize the acid in water 
B
supply mineral salt to water plant 
C
supply carbondioxide for photosynthesis 
D
kill micro-organisms in water 
Explanation.

The bicarbonate solution will provide the elodea with the carbon dioxide it needs to use photosynthesis.


Correct Option:
C
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Question 53
A
Cerebrum 
B
Cerebellum 
C
Medulla oblongata 
D
Spinal cord 
Explanation.

The Cerebrum is the part of the brain concerned with emotions, speech, reasoning etc.


Correct Option:
A
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Question 54
A
nitrate 
B
nitrites 
C
amino acids 
D
ammonium 
Explanation.

When a plant or animal dies or an animal expels waste, the initial form of nitrogen is organic. Bacteria or fungi convert the organic nitrogen within the remains back into ammonium \(NH^{+}_{4}\), a process called ammonification.


Correct Option:
D
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Question 55
A
grasping 
B
walking 
C
feeling 
D
web spinning 
Explanation.

The pedipalps are the two appendages found in the front of a spider's head. The spiders use them to grasp the insect in order for them to eat.


Correct Option:
A
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Question 56
A
32 
B
16 
C
D
Explanation.

A gamete is a haploid sex cell of an organism which is reproduced sexually. They contain half the number of chromosomes in an organism.

no of chromosomes = 16, hence, no of chromosomes in the gamete = \(\frac{1}{2}\) of 16 = 8


Correct Option:
C
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Question 57
A
radula 
B
mantle 
C
tentacle 
D
foot 
Explanation.

The mantle is also known by the Latin word pallium (adj. pallial). Snails originally breathe by gills situated in the pallial cavity.


Correct Option:
B
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Question 58
A
toxins released into the blood as a result of the destruction of red blood cell 
B
the multiplication of the malaria sporozites in the liver 
C
the invasion of the red blood cells by the trophozoites 
D
the development of merozoites into gametocytes 
Explanation.

Once you're bitten by the female anopheles, the parasite enters the bloodstream and travels to the liver. The infection develops in the liver before re-entering the bloodstream and invading the red blood cells.


Correct Option:
B
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Question 59
A
contrasting antigens reacts with contrasting antibodies 
B
similar antigens react with similar antibodies 
C
two different antigens react with each other 
D
two different antibodies react with each other 
Explanation.

No official Explanation yet!


Correct Option:
B
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Question 60
A
B
II 
C
III 
D
IV 
Explanation.

the part labelled I is called the ROOT HAIR... it is responsible for the absorption of minerals and water from the soil into the plant


Correct Option:
A
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