A ripe mango, kept with unripe mangoes causes their ripening. This is due to the release of a gaseous plant hormone

Auxin

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Ethylene

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Solution

The correct option is D Ethylene
Ethylene is a gaseous hormone which has many functions such as fruit ripening, flower wilting, and leaf fall. It is unusual because of its gaseous nature. Ethylene brings about change in colour, texture and softens the ripening fruits. Some fruits release ethylene as the ripening begins. Thus, the correct answer is option D.

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