Question : Phototropic movement is controlled by which of the following?
Option 1: Auxin
Option 2: Gibberellin
Option 3: Cytokinin
Option 4: Ethylene
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Correct Answer: Auxin
Solution : The correct option is Auxin.
The plant hormone Auxin is principally responsible for phototropic movement, which is the growth response of plants towards or away from a light source. When the shoot (stem) senses light from one direction, Auxin is redistributed throughout the plant to favour development on the shaded side, leading the plant to bend or grow towards the light source.
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