Phototropism is the growth of a plant towards or away from a light stimulus. Positive phototropism (growth towards light) in shoots is mediated by the hormone auxin, which promotes differential cell elongation.
The growing plant bends towards the source of light only on one side. Identify the best explanation for this phenomenon.
Asked in KPSC KAS Prelims 2017 · Topic: Plant Hormones (Auxins: Biosynthesis, Transport, and Physiological Effects)
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Answer: D. Auxin accumulates towards darker side to induce greater cell elongation
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