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Melatonin plays an important role in regulating a rhythm of what length?
ATwenty-nine hours
BThirty-four minutes
CThirty-nine minutes
DTwenty-four hours
Answer & Solution
Correct answer: D. Twenty-four hours
1. Melatonin comes from the pineal gland.
2. It governs the daily cycle of sleeping and waking.
3. Melatonin plays a very important role in the regulation of a 24-hour rhythm of our body.
4. So the answer is twenty-four hours.
_Source: NCERT Class XI Biology, Ch 19 'Chemical Coordination and Integration'_
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