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Artificial light, extended work-time and reduced sleep-time disrupt the activity of –

1. (a) Posterior pituitary gland
2. (b) Thymus gland
3. (c) Pineal gland
4. (d) Adrenal gland

Correct answer: (c) Pineal gland

Solution

The pineal gland produces melatonin, which regulates circadian rhythms and sleep. Artificial light and reduced sleep disrupt melatonin secretion, so the pineal gland’s activity is affected.

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