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Which major hormone promotes growth in plants?

Answer and explanation

Correct answer: Auxin

The governing concept is plant hormonal coordination. Auxin is a plant hormone that promotes cell elongation, especially in young shoots, and it also helps produce directional growth such as phototropism. Therefore, option A, Auxin, is correct. Insulin regulates blood glucose in animals, adrenaline supports emergency responses, and thyroxine regulates metabolism, so these distractors are not the major plant-growth hormone.

Related tags

AuxinPlant HormonesPlant GrowthControl And CoordinationScienceClass 10 Mcq

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