The bending of the stem of a plant towards a source of light is caused by the action of a phytohormone known as (a) abscisic acid
(b) auxin
(c) gibberellins
(d) cytokinin
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Answer:
(b) auxin
Explanation:
When a plant senses a directional light stimulus it redistributes its auxin molecules to the side that is further away from the light. As a consequence, the plant cells that are further away from the light experience a greater auxin concentration and grow faster, causing the shoot to bend towards the light.
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