Neural Control and Coordination · Question 25

Which one of the following statements is not correct?

1. Retinal is the light absorbing portion of visual photo pigments.
2. In retina the rods have the photopigment rhodopsin while cones have three different photopigments.
3. Retinal is a derivative of vitamin C.
4. Rhodopsin is the purplish red protein present in rods only.

The most abundant intracellular cation is

1. H+
2. K+
3. Na+
4. Ca++.

A diagram showing axon terminal and synapse is given. Identify correctly at least two of A - D. [Figure]

1. A - Receptor, C - Synaptic vesicles
2. A - Neurotransmitter, B - Synaptic cleft
3. C - Neurotransmitter, D - Ca++
4. B - Synaptic connection, D - K+

Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/characteristics. [Figure]

1. B - Blind spot - Has only a few rods and cones.
2. A - Retina - Contains photoreceptors, i.e., rods and cones.
3. C - Aqueous chamber - Reflects the light which does not pass through the lens.
4. D - Choroid - Its anterior part forms ciliary body.

The figure shows an axon terminal and synapse. Select the option giving correct identification of labels A-D. [Figure]

1. C-Receptor, D-Synaptic vesicles
2. A-Axon terminal, B-Serotonin complex
3. A-Action potential, C-Neurotransmitter
4. B-Neurotransmitter, D-Receptor capsules

A sagittal section of human brain is shown here. Identify at least two labels from A-D. [Figure]

1. A-Cerebral hemispheres, B-Cerebellum
2. B-Corpus callosum, D-Medulla
3. C-Mid brain, D-Cerebellum
4. A-Cerebrum, C-Pons

The human hind brain comprises three parts, one of which is

1. spinal cord
2. corpus callosum
3. cerebellum
4. hypothalamus.

Which part of the human ear plays no role in hearing as such but is otherwise very much required?

1. Eustachian tube
2. Organ of Corti
3. Vestibular apparatus
4. Ear ossicles

When a neuron is in resting state i.e., not conducting any impulse, the axonal membrane is

1. comparatively more permeable to Na+ ions and nearly impermeable to K+ ions
2. equally permeable to both Na+ and K+ ions
3. impermeable to both Na+ and K+ ions
4. comparatively more permeable to K+ ions and nearly impermeable to Na+ ions.

The purplish red pigment rhodopsin contained in the rod type of photoreceptor cells of the human eye, is a derivative of

1. vitamin B1
2. vitamin C
3. vitamin D
4. vitamin A