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Question

The movement of organs in response to light is called as .............

A
Hydrotropism
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B
Thigmotropism
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C
Phototropism
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D
Geotropism
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Solution

The correct option is C Phototropism
Phototropism is the growth of organisms in response to light. It is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the farthest side from the light. Phototropism is one of the many plant tropisms which respond to external stimuli.

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