Q.

Plant growth regulators involved in formations of root hairs and chloroplast are respectively

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a

ethylene and cytokinin

b

cytokinin and ethylene

c

auxin and gibberellin

d

ethylene and auxins

answer is D.

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Detailed Solution

Ethylene promotes root growth and root hair formation, thus helping the plants to increase their absorption surface. Cytokinin helps to produce chloroplasts in leaves.

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