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Question

The movement of root away from light is

A
Positive hydrotropism
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B
Negative hydrotropism
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C
Positive phototropism
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D
Negative phototropism
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Solution

The correct option is D Negative phototropism
The directional growth movements in which direction of growth is determined by the direction of stimulus are known as tropic movements. Tropic movement of plants/plant parts in response to moisture or water is called as hydrotropism. This makes options A and B incorrect as the question is about the movement of plants in response to light stimulus. Growth movement of plants in response to light is known as phototropism. Growth movement of plants towards the stimulus is known as positive tropism while movement of plant/plant parts away from the stimulus is known as negative tropism. This makes option C incorrect and option D correct as the movement of root away from light is known as negative phototropism. The correct answer is D.

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