Question

Assertion (A): Transport of plant growth regulators is strictly polarized and unidirectional.
Reason (R): Organic and mineral nutrients undergo multi-directional transport.

• (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

Hint:

Only auxins show polar transport. Others like ABA, cytokinins, and gibberellins move bidirectionally.

Answer 1

The Correct Option is D

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.