Production of Cucumber has increased manifold in recent years. Application of which of the following

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NEET is a competitive examination conducted in India. This question is from the 2022 NEET Biology paper.

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Question

Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants :
(1) Cytokinin (2) ABA (3) Gibberellin (4) Ethylene

Accepted Answer

Correct Answer: D — EthyleneStep-by-step Solution:Ethylene is the only gaseous plant hormone. In cucurbits (cucumber, pumpkin, etc.), application of ethylene increases the ratio of female to male flowers, resulting in higher fruit set and increased yield. Since cucumber bears separate male and female flowers (monoecious), more female flowers directly means more cucumbers.Why other options are wrong:Cytokinin — promotes cell division, delays senescence, breaks apical dominance; does not influence sex expression in cucurbits.ABA (Abscisic acid) — a stress hormone that promotes dormancy, stomatal closure, and inhibits growth.Gibberellin — promotes male flower production in cucurbits (opposite effect); also promotes stem elongation and seed germination.Key Concept: Ethylene — promotes female flower formation in cucurbits, fruit ripening, abscission, and senescence. It is produced in response to stress and is a gaseous hormone (C₂H₄).

Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants : (1) Cytokinin (2) ABA (3) Gibberellin (4) Ethylene

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Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants : (1) Cytokinin (2) ABA (3) Gibberellin (4) Ethylene

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