NEET · Biology · Class 11Neural Control and Coordination — NEET Biology MCQs
30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.
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Sample questions from this chapter
A sensory receptor in the skin detects a hot surface. Which fibre first carries this information toward the central neural system?
- An afferent fibre ✓
- An efferent fibre
- A sympathetic motor fibre
- A neurosecretory fibre from the hypothalamus
Answer: A. Afferent fibres conduct impulses from tissues and receptors to the CNS. The common direction trap is to confuse afferent arrival with efferent exit.
Why not B: Efferent fibres carry regulatory commands away from the CNS to peripheral effectors.
Why not C: Sympathetic fibres regulate involuntary targets and are not the incoming sensory route described.
Why not D: Hypothalamic neurosecretory cells release hormones rather than carrying cutaneous sensation inward.
Site A of an axon is depolarised while adjacent site B is still at rest. How does local current help excite B?
- The sodium-potassium pump at A directly injects neurotransmitter into B
- Myelin transfers K⁺ from A into the nucleus at B
- Current flows internally from A toward B and externally back toward A, completing a circuit ✓
- Negatively charged proteins diffuse from A to B through the membrane
Answer: C. The polarity difference drives local circuit current: along the inside from depolarised A to resting B and along the outside in the reverse direction. This brings B to depolarisation and propagates the impulse.
Why not A: The pump maintains gradients and neurotransmitter acts at terminals; neither directly jumps between adjacent axonal sites.
Why not B: Myelin insulates axon segments and does not route potassium into a neighbouring nucleus.
Why not D: Impermeant axoplasmic proteins do not provide the propagating membrane current.
A drug prolongs Na⁺ permeability and prevents the usual rise in K⁺ permeability after an action potential begins. Which electrical defect is expected at the treated site?
- Delayed repolarisation because outward K⁺ current cannot promptly restore negativity ✓
- Failure of depolarisation because sodium stays outside
- Rapid repolarisation driven mainly by extra cycles of the Na⁺/K⁺ pump
- Conversion of the chemical synapse into an electrical one
Answer: A. Normal repolarisation follows the brief sodium phase when K⁺ permeability rises and potassium exits. Preventing that switch leaves the membrane depolarised longer despite a working gradient-maintenance pump.
Why not B: Prolonged sodium permeability favours continued Na⁺ entry and depolarisation rather than preventing it.
Why not C: The pump cannot substitute on spike timescales for the missing rapid outward potassium conductance.
Why not D: Axonal channel kinetics do not change the anatomical type of a downstream synapse.
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Questions
How many NEET questions are there on Neural Control and Coordination?
This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.
Is this NEET Biology chapter test free?
Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.
Do the questions explain the wrong options?
Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.