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GATE 2021 XH5 – Question 46

Biological and Evolutionary Basis of Behaviour · Nervous System and Brain: Structures of the brain and their functions, neurons, neural impulse, synaptic transmission, neurotransmitters, hemispheric lateralization · 2 marks · Multiple choice

Match neurotransmitters P acetylcholine, Q norepinephrine, R serotonin and S GABA to effects: (i) alertness/wakefulness; (ii) mood,eating,sleep and arousal regulation; (iii) major inhibitory transmitter in the brain; (iv) muscle action,learning and memory; (v) implicated in Parkinson’s disease.

  1. P–(iv),Q–(i),R–(ii),S–(iii)
  2. P–(iii),Q–(i),R–(ii),S–(v)
  3. P–(i),Q–(ii),R–(iv),S–(iii)
  4. P–(iv),Q–(i),R–(v),S–(iii)

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Show answer and explanation

Correct answer: (A) P–(iv),Q–(i),R–(ii),S–(iii)

Explanation

Acetylcholine matches muscle action and learning/memory; norepinephrine alertness; serotonin the stated mood and sleep functions; GABA inhibition. Hence P–iv,Q–i,R–ii,S–iii, A. Parkinson’s disease is classically linked to dopaminergic neuronal loss, so(v) is the distractor. These are broad textbook associations rather than exclusive one-function mappings.

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