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Etiolation is depigmentation of leaf when plant is placed in dark for more than 36 hrs.

1. Etiolation is leaf depigmentation.
2. Etiolation occurs in darkness.
3. Etiolation happens after 36 hrs in dark.
4. Etiolation is a plant response to darkness.

Correct answer: Etiolation is a plant response to darkness.

Solution

Etiolation refers to a set of changes plants show when grown in darkness, such as pale color and elongated growth. So the best statement is the one describing it as a plant response to darkness, not just leaf depigmentation or a time limit.

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