Question:
Assertion (A): Transport of plant growth regulators is strictly polarized and unidirectional.
Reason (R): Organic and mineral nutrients undergo multi-directional transport.
Assertion (A): Transport of plant growth regulators is strictly polarized and unidirectional.
Reason (R): Organic and mineral nutrients undergo multi-directional transport.
Reason (R): Organic and mineral nutrients undergo multi-directional transport.
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Only auxins show polar transport. Others like ABA, cytokinins, and gibberellins move bidirectionally.
Updated On: Jun 2, 2025
- (A) and (R) are true. (R) is correct explanation for (A)
- (A) and (R) are true. But (R) is not correct explanation for (A)
- (A) is true, but (R) is false
- (A) is false, but (R) is true
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The Correct Option is D
Solution and Explanation
Assertion (A): False — Not all plant growth regulators show strict polar transport. Only auxins show unidirectional flow (from apex to base), while others like cytokinins move non-polar.
Reason (R): True — Organic (via phloem) and minerals (via xylem) can move in various directions, depending on the plant’s need.
Reason (R): True — Organic (via phloem) and minerals (via xylem) can move in various directions, depending on the plant’s need.
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