NEET (UG)

Practice Test 1 — Neural Control and Coordination

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

The structural and functional unit of the neural system is the:

Solution: The neuron is the unit of the neural system.

Question 2

The autonomic nervous system controls:

Solution: The ANS controls involuntary smooth/cardiac muscle and glands.

Question 3

At rest, the neuron membrane is more permeable to:

Solution: The resting membrane is more permeable to K⁺.

Question 4

Reversal of membrane polarity by Na⁺ influx is called:

Solution: Na⁺ influx causes depolarisation.

Question 5

Transmission across a chemical synapse is:

Solution: Chemical synapses transmit in one direction only.

Question 6

The relay centre for sensory impulses in the brain is the:

Solution: The thalamus relays sensory and motor signals.

Question 7

Which protects the brain along with the meninges?

Solution: CSF cushions the brain within the meninges.

Question 8

Dilation of the pupils and increased heart rate are caused by the:

Solution: The sympathetic (fight-or-flight) system causes these.

Section B — Assertion & Reason

Question 9

A: Myelinated nerve fibres conduct impulses faster than non-myelinated fibres.
R: In myelinated fibres the impulse jumps from one node of Ranvier to the next.

Solution: Saltatory (node-to-node) conduction is why they are faster — R explains A.

Question 10

A: A chemical synapse conducts the impulse in only one direction.
R: The neurotransmitter is released by the pre-synaptic knob and its receptors lie on the post-synaptic membrane.

Solution: Release on one side, receptors on the other → one-way; R explains A.

Question 11

A: The medulla oblongata is the centre for memory and intelligence.
R: The medulla oblongata controls respiration and heartbeat.

Solution: A is false — memory/intelligence is the cerebrum; R is true (medulla controls respiration/heartbeat).

Question 12

A: Reflex actions are very rapid.
R: They are processed by the spinal cord without waiting for the brain to respond.

Solution: Spinal-cord processing makes reflexes fast — R explains A.