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What causes a green plant exposed to the...

What causes a green plant exposed to the light on only one side, to bend toward the source of light as it grows 

A

Green plants seek light because they are phototropic

B

Light stimulates plant cells on the lighted side to grow faste

C

Auxin accumulates on the shaded side, stimulating greater cell elongation there.

D

Green plants need light to perform photosynthesis

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