One of the following plant hormones is responsible for the phenomenon of phototropism in plants. This is :

auxin

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cytokinin

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gibberellin

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eltroxin

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Solution

The correct option is A
auxin

The correct answer is: D. auxin.
•Auxin is responsible for the phenomenon of phototropism in plants.
•When a growing plant is exposed to light from only one side, then it responds by bending its stem towards the light. This is phototropism.
•The plant stem responds to light and bends towards it due to the action of 'auxin hormone'.

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(d) Plant roots grow downward in response to .............

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(i) The response of leaves to the sunlight is called ..............

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