Which of the following stimulates growth or cell enlargement?

Gibberellin

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Auxin

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Cytokinin

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Ethylene

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Solution

The correct option is B Auxin
Auxin is a plant hormone that plays important role in plant growth. It stimulates stem elongation by increasing permeability of cells which in turn increases uptake of water by cells. It also increases the respiration rate. It also enhances plasticity of cell walls which results in cell enlargement.
Thus, the correct answer is option B.

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Name the following :

(a) Hormone that stimulates growth by cell-division.

(b) Growth retarding hormone in plants.

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