what would be the answer?

Dear student,

Sunflower shows phototrophic movement. The property of a plant to turn and grow towards the sun is known as phototropism or phototrophic movement.
This movement occurs due to the effect of a hormone called auxin present in plants.

Auxin is a plant growth promoter synthesized in the stems, buds and the root parts of the plant.
It increases the root and the shoot tips of the plants thus helping in cell elongation and the growth of the plant.

Correct option is C.

Hope this helps,
Regards.
 

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