BIOLOGY (2018) | Study Mode

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Question 12
A
because the walls of capillaries are very thin 
B

to avoid high blood pressure

 
C
to ensure that the individual does not get dizzy 
D
to allow adequate time for exchange of materials 
Explanation.
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Correct Option:
D
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Question 13
A
Fishes, amphibians, birds, man 
B
Fishes, amphibians, annelids, insects 
C
Fishes, reptiles, birds, tapeworms 
D
Fishes protozoans, amphibians, man 
Explanation.
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Correct Option:
A
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Question 14
A
possess values at internals throughout their length. 
B
have thick muscular and elastic walls 
C
carry blood away from the heart 
D
transport oxygenated blood with the exception of the pulmonary artery. 
Explanation.
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Correct Option:
A
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Question 15
A

The bird's blood was always warmer than that of the lizard

 
B

The body temperature of the bird varied less than that of the lizard during changes in environmental temperature

 
C

The body temperature of the bird remained constant despite changes in environmental temperature

 
D

The body temperature of the lizard was always close to that of the environmental temperature

 
Explanation.
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Correct Option:
C
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Question 16
A
Homeostasis 
B
Homeothermy 
C
Poikilothermy 
D
Osmoregulation 
Explanation.
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Correct Option:
C
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Question 17
A
because salt is a preservative 
B
to prevent contamination of the body 
C
to maintain the composition of body fluids 
D
to increase the number of blood cells 
Explanation.
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Correct Option:
C
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Question 19
A
converging the Light rays before they enter the eye 
B
diverging the light rays before they enter the eye 
C
reducing light intensity before it enters the eye 
D
increasing light intensity before it enters the eye 
Explanation.
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Correct Option:
A
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