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Which experiment will best show the effect of gibberellin?

Answer and explanation

Correct answer: Increase in stem length of a dwarf plant

The governing concept is the role of plant hormones in growth. Gibberellin promotes cell elongation and can increase the length of stems, so comparing a treated dwarf plant with an untreated one would provide clear evidence. Therefore option A is correct. Hand withdrawal is a nervous reflex, blood-sugar reduction involves insulin, and pupil contraction is controlled by the nervous system; these effects do not test gibberellin.

Related tags

GibberellinPlant HormonesStem GrowthPlant ExperimentControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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