General
✓✗The neural membrane contains different types of ion channels that are
- impermeable to all ions at all times
- permeable only to proteins
- equally permeable to all ions
- selectively permeable to different ions
General
✓✗Which of the following is incorrectly matched?
- Unipolar neuron - embryonic stage
- Bipolar neuron - cerebral cortex
- Bipolar neuron - retina
- Multipolar neuron - cerebral cortex
General
✓✗Match List I with List II.
Choose the correct answer from the options given below.
| List I | List II |
| A. Dendrites | i. Bulb-like ending containing synaptic vesicles |
| B. Axon | ii. Short branched fibres carrying impulses towards the cell body |
| C. Synaptic knob | iii. Contains typical organelles and Nissl's granules |
| D. Cell body | iv. Long fibre carrying impulses away from the cell body |
- A-ii, B-iv, C-i, D-iii
- A-iv, B-ii, C-i, D-iii
- A-iii, B-i, C-iv, D-ii
- A-ii, B-iv, C-iii, D-i
General
✓✗Match Column I with Column II.
Choose the correct answer from the options given below.
| Column I | Column II |
| A. CNS | i. Carry impulses from tissues and organs to the CNS |
| B. PNS | ii. Carry impulses from the CNS to tissues and organs |
| C. Afferent fibres | iii. Comprises the brain and spinal cord |
| D. Efferent fibres | iv. Comprises all the nerves associated with the CNS |
- A-iv, B-iii, C-ii, D-i
- A-i, B-ii, C-iii, D-iv
- A-iii, B-iv, C-i, D-ii
- A-iii, B-iv, C-ii, D-i
General
✓✗Which of the following correctly compares electrical and chemical synapses?
- Electrical - faster and rare; chemical - uses neurotransmitters across a cleft
- Electrical - slower and common; chemical - current flows directly
- Electrical - uses neurotransmitters; chemical - membranes in very close proximity
- Electrical - wide cleft; chemical - no cleft at all
General
✓✗The cerebral cortex appears grey because
- it is filled with fluid
- myelinated fibres are concentrated in it
- it is covered by the dura mater
- neuron cell bodies are concentrated in it
General
✓✗The correct sequence of events at a chemical synapse is
- ion channels open, vesicles fuse, impulse arrives, neurotransmitter binds receptors
- vesicles fuse, impulse arrives, ion channels open, neurotransmitter released, binds receptors
- impulse arrives, vesicles fuse, neurotransmitter released, binds receptors, ion channels open
- neurotransmitter binds receptors, impulse arrives, vesicles fuse, ion channels open
General
✓✗Given below are two statements.
Statement I: The cerebrum wraps around the thalamus.
Statement II: The hypothalamus lies at the base of the thalamus.
In the light of the above statements, choose the correct answer from the options given below.
Statement I: The cerebrum wraps around the thalamus.
Statement II: The hypothalamus lies at the base of the thalamus.
In the light of the above statements, choose the correct answer from the options given below.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗In which of the following states is the outer surface of an axonal membrane positively charged?
- At the peak of an action potential
- Resting state
- At a depolarised site
- At the synaptic knob only
General
✓✗Impulses that regulate the smooth muscles of the stomach wall pass through the
- corpus callosum
- afferent fibres of the skin
- somatic neural system
- autonomic neural system
General
✓✗How many of the following structures are found in the axon or its terminals?
A. Synaptic knobs
B. Synaptic vesicles
C. Nissl's granules
D. Nodes of Ranvier (in myelinated fibres)
E. Neurotransmitters
A. Synaptic knobs
B. Synaptic vesicles
C. Nissl's granules
D. Nodes of Ranvier (in myelinated fibres)
E. Neurotransmitters
- 4
- 3
- 5
- 2
General
✓✗Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The extracellular fluid around a resting axon has a high concentration of Na+.
Reason (R): The sodium-potassium pump actively moves Na+ out of the axon, keeping it high in the extracellular fluid.
In the light of the above statements, choose the correct answer from the options given below.
Assertion (A): The extracellular fluid around a resting axon has a high concentration of Na+.
Reason (R): The sodium-potassium pump actively moves Na+ out of the axon, keeping it high in the extracellular fluid.
In the light of the above statements, choose the correct answer from the options given below.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗Restoration of the resting potential at a site of excitation is due to
- Na+ diffusing into the axoplasm
- proteins diffusing outside the membrane
- K+ diffusing outside the membrane
- neurotransmitter binding to receptors
General
✓✗Which of the following statements about synaptic knobs is incorrect?
- They are bulb-like endings of axon branches.
- They possess synaptic vesicles.
- They are present at the tips of dendrites.
- Their vesicles contain neurotransmitters.
General
✓✗Faster conduction of impulses along a myelinated nerve fibre is due to the presence of
- Nissl's granules in the axon
- a myelin sheath with nodes of Ranvier
- synaptic vesicles along the axon
- many dendrites on the cell body