21. Colour blindness in human ' eing is due to
A
Vitamin A deficiency
B
Sex linked inheritance
C
Over activity of adrenal gland
D
Excessive drinking of alcohol Kidney
Answer :
Sex linked inheritance
22. Bowman's glands are located in the
A
Proximal end of uriniferous tubules
B
Anterior pituitary
C
Female reproductive system of cockroach
D
Olfactory epithelium of our nose
Answer :
Olfactory epithelium of our nose
23. Ivan Pavlov performed experiments on
A
simple reflexes
B
conditioned reflexes
C
cardiac reflexes
D
origin of life
Answer :
conditioned reflexes
24. The aperture controlling the light entering in eye is called
A
Iris
B
Pupil
C
Blind spot
D
Sclerotic layer
Answer :
Pupil
25. During night when the intensity is low, it is detected by
A
Road
B
Cones
C
A and B both
D
Crystaline lens
Answer :
Road
26. Alzheimer disease in humans is associated with the deficiency of:
A
glutamic acid
B
acetylcholine
C
gamma aminobutyric acid (GABA)
D
dopamine
Answer :
acetylcholine
27. The damage to ear by sudden explosion (loud sound) is prevented by
A
Eustachians tubes
B
Tensor tympani muscles
C
Stapedius muscles
D
All of the above
Answer :
Eustachians tubes
28.
A diagram showing axon terminal and synapse is given. Identify correctly at least two of $$A-D.$$
A
$$B$$-Synaptic connection, $$D$$-$${K^{ + }}$$
B
$$A$$-Neurotransmitter, $$B$$-Synaptic cleft
C
$$C$$- Neurotransmitter, $$D$$-$$C{a^{ + + }}$$
D
$$A$$-Receptor, $$C$$-Synaptic vesicles
Answer :
$$A$$-Receptor, $$C$$-Synaptic vesicles
29. Which of the following statements is not correct ?
A
In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction
B
An action potential in an axon does not move backward because the segment behind is in a refractory phase
C
Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels
D
Rods are very sensitive and contribute to daylight vision
Answer :
Rods are very sensitive and contribute to daylight vision
30. Vision infrog is
A
Binocular
B
Monocular
C
A and B both
D
None of the above
Answer :
Monocular