Single correct option
The movement of a plant shoot towards light is called
- A. geotropism
- B. hydrotropism
- C. phototropism
- D. thigmotropism
Show answer and solution
Answer: (C) phototropism
Auxin collects on the shaded side of the shoot and makes the cells there grow longer, so the shoot bends towards the light. This is positive phototropism. Geotropism is the response to gravity, hydrotropism to water and thigmotropism to touch, as in tendrils.
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