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

(A)

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

(B)

Green plants need light to perform photosynthesis.

(C)

Green plants seek light because they are phototropic.

(D)

Light stimulates plant cells on the lighted side to grow faster.

NEET - Medical UG-2015 Medium

Answer & Solution:

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

When a green plant is exposed to light from one side it bends towards the source of light due to the effect of auxins. Auxin accumulates on the shaded side due to which it stimulates cell elongation and enlargement. Its movement is polar and passes from shoot tip to region of elongation.

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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 ?

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