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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 need light to perform photosynthesis
B
Green plants seek light because they are phototropic
C
Light stimulates plant cells on the lighted side to grow faster
D
Auxin accumulates on the shaded side, stimulating greater cell elongation there
Detailed Solution
Auxin moves away from the illuminated side and accumulates on the shaded side.
There it stimulates greater cell elongation, so the plant bends towards the light.
There it stimulates greater cell elongation, so the plant bends towards the light.