High auxin concentration may inhibit growth in roots but promote growth in stems. What conclusion follows from this?
Answer and explanation
Correct answer: The effect of the same hormone can depend on the organ and its concentration
The governing concept is differential sensitivity to plant hormones. Roots and stems do not respond identically to the same auxin concentration: a level that promotes elongation in a stem may inhibit elongation in a root. Therefore option A correctly concludes that hormone action depends on both the responding organ and concentration. Auxin is a plant hormone, roots do respond to stimuli, and the stem does not always grow towards water.
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What is the correct answer to this question?
The effect of the same hormone can depend on the organ and its concentration
Why is this the correct answer?
The governing concept is differential sensitivity to plant hormones. Roots and stems do not respond identically to the same auxin concentration: a level that promotes elongation in a stem may inhibit elongation in a root. Therefore option A correctly concludes that hormone action depends on both the responding organ and concentration. Auxin is a plant hormone, roots do respond to stimuli, and the stem does not always grow towards water.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Control and Coordination. Topic: Plant hormones.
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