81.
The vitreous humor , a jelly like substance which is found in posterior part of
A
Eye
B
Ear
C
Nose
D
Heart
Answer :
Eye
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82.
The external ears of mammals
A
Are also called pinnae
B
Are absent in monotremes
C
Can be moved in various direction by many mammals
D
All of the above
Answer :
All of the above
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83.
In the chemistry of vision in mammals, the photosensitive substance is called
A
sclerotin
B
retinol
C
rhodopsin
D
melanin
Answer :
rhodopsin
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84.
The ear ossicles of rabbit lie in the
A
Auditory capsules
B
External auditory meatus
C
Tympanic cavity
D
Tympanic bulla
Answer :
Tympanic cavity
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85.
Night blindness is caused due to
A
Hypermatropia
B
Myopia
C
Defective cornea
D
Deficiency of rhodopsin in rods
Answer :
Deficiency of rhodopsin in rods
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86.
In vertebrates, simple reflex action is
A
polysynaptic
B
bisynaptic
C
trisynaptic
D
monosynaptic
Answer :
monosynaptic
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87.
The middle ear and internal ear of mammals are enclosed in which of the following bones
A
Mastoid
B
Ethmoid
C
Tympanic bulla
D
Tympanic bulla and periotic bone (temporal bone)
Answer :
Tympanic bulla and periotic bone (temporal bone)
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88.
Receptor sites for neurotransmitters are present on :
A
Pre-synaptic membrane
B
Tips of axons
C
Post-synaptic membrane
D
Membrane of synaptic vesicles
Answer :
Post-synaptic membrane
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89.
Nissl bodies are mainly composed of
A
Proteins and lipids
B
DNA and RNA
C
Free ribosomes and RER
D
Nucleic acids and SER
Answer :
Free ribosomes and RER
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90.
Our ear can hear sound waves of the frequency
A
Above 20,000 cycles / sec.
B
5 - 100 cycles / sec.
C
50-20,000 cycles / sec.
D
20-20,000 cycles / sec
Answer :
20-20,000 cycles / sec
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