Plants kept in dark place grow and bend towards light because

These need light for photosynthesis

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These need oxygen for respiration

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These are attracted towards light

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Their cells on shaded side become more elongated.

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Solution

The correct option is D
Their cells on shaded side become more elongated.

Plant cells contain a substance called auxins. This substance has a tendency to move away from the light. Auxins make the cells on the darker side grow faster than the cells on the lighted side.

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