Animal Physiology MCQs Part 20

1) The band of fibres which join corpora quadrigemina to cerebellum is called
a) Pons varolii
b) Valve of Vieusseus
c) Corpus callosum
d) Corpus striatum

2) Primary function of myelin sheath around vertebrate axon is to
a) Regulate Na – K pump
b) Increase in size of action potential
c) Increase in speed of conduction by preventing leakage of nerve impulse
d) Deactivate the release of neurotransmitter

3) The unidirectional transmission of a nerve impulse is maintained by the
a) Synapses
b) Myelin sheath
c) Membrane polarity
d) Interneurons

4) A synaptic vesicle occurs in a
a) Presynaptic neuron
b) Post-synaptic neuron
c) Synaptic cleft
d) None of the above

5) The tympanic membrane is stretched over a cartilaginous ring. It is
a) Columella
b) Fenestra ovalis
c) Tympanicus annulus
d) None of the above

6) The vascular coat of the eye is called the
a) Sclerotic
b) Choroid
c) Retina
d) Nil

7) In the mammalian eye, the power of accomodation is controlled by changing thickness of the lens, governed by the
a) Cornea
b) Pupil
c) Iris
d) Ciliary body

8) Vestibule is constituted by
a) Semicircular canals and utriculus
b) Sacculus and ampullae
c) Sacculus and ampullae
d) Ampullae and lgena

9) In hypermetropia, the image is formed
a) Before the retina and is corrected by convex lens
b) Behind the retina and is corrected by convex lens
c) Before the retina and is corrected by concave lens
d) Behind the retina and is corrected by concave lens

10) The pigment in the cone cells of man responsible for detecting red colour is
a) Erythrolabe
b) Chlorolabe
c) Cyanolabe
d) Rhodopsin

11) The human eye is most sensitive to
a) Red colour
b) Green colour
c) Violet colour
d) Orange colour

12) The stapes is fitted on the
a) Fenestra rotunda
b) Fenestra ovalis
c) Foramen magnum
d) None of the above

13) The blind spot is the region where the
a) Image is formed
b) Cones are numerous
c) Optic nerve leaves the eye ball
d) Image is formed during the dark

14) Jacobson’s organs is found in the
a) Nose
b) Eye
c) Kidney
d) Ear

15) The ear is most sensitive to sound waves of
a) 1000 cycles/sec
b) 10000 cycles/sec
c) 4000 cycles/sec
d) 20 cycles/sec

16) Fovea centralis perceives
a) Dim light
b) Diffuse light
c) Coloured light and bright light
d) Coloured light and dim light

17) Organs of Ruffini are receptors of
a) Cold
b) Pressure
c) Heat
d) Touch

18) Ora serrata is
a) a part of the retina
b) Present in utriculus of ear
c) A gland present in the oral cavity of a frog
d) the oral cavity of protochordates

19) The black pigment of the eye which reduces internal reflection is located in the
a) Choroid
b) Iris
c) Sclerotic
d) Cornea

20) Iodopsin pigments erythrolabe, chlorolabe, and cyanolabe are sensitive to, respectively,
a) Red, green and blue
b) Blue, green and red
c) Red, blue and green
d) Green, red and blue

21) The number of rod cells in the human eye is
a) 120 million
b) 80 million
c) 60 million
d) 180 million


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