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, and you get your all-India rank on every one. Nothing on the site is on sale right now.
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.