What causes a green plant exposed to the light, on only one side, to bend towards the source of light as it grows?
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a
Light stimulates plant cells on the lighted side to grow faster.
b
Auxin accumulates on the shaded side, stimulating greater cell elongation there.
c
Green plants need light to perform photosynthesis.
d
Green plants seek light because they are phototropic.
answer is B.
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Detailed Solution
When a green plant exposed to the light, on only one side, it bend towards the source of light as it grows because Auxin accumulates on the shaded side, stimulating greater cell elongation there.