1(ii)
A farmer notices that storing ripe mangoes with unripe ones speeds up the ripening process. The phytohormone primarily responsible for this phenomenon is:
- (a)Auxins
- (b)Cytokinins
- (c)Gibberellins
- (d)Ethylene
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Ethylene
Reason — Ethylene is a gaseous plant hormone that promotes the ripening of fruits. Ripe mangoes release ethylene, which speeds up ripening in nearby unripe mangoes.