Roots exhibit negative phototropism.To demonstrate the reason of this phenomenon, the roots of a potted plant are placed parallel tothe soil. The result shows that auxin gathers in the
Correct answer: B. lower half of the root and slows down the growth.
- A. lower half of the root and stimulates growth.
- B. lower half of the root and slows down the growth.
- C. upper half of the root and slows down the growth.
- D. Upper half of the root and stimulates growth
Explanation
In a root placed horizontally, the bottom side contains more auxin and grows less, causing the root to move away from light. So option B is correct. All other options are incorrect.
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