Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin:
(1

Q: What is NEET?

NEET is a competitive examination conducted in India. This question is from the 2024 NEET Biology paper.

Q: How can I prepare for NEET Biology?

To prepare for NEET Biology, practice previous year questions (PYQs), understand concepts thoroughly, and solve mock tests regularly. This 2024 question covers Plant Growth and Development topic.

Q: What is the difficulty level of this question?

This NEET 2024 Biology question has a easy difficulty level and is marked as an important question.

Q: Where can I find more NEET previous year questions?

You can find more NEET previous year questions on AspirantMitraa. Browse by subject, topic, year, and difficulty level to practice effectively.

Question

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin:
(1) promotes apical dominance.
(2) promotes abscission of mature leaves only.
(3) does not affect mature monocotyledonous plants.
(4) can help in cell division in grasses, to produce growth.

Accepted Answer

Correct Answer: C — does not affect mature monocotyledonous plants.Step-by-step Solution:Auxins are plant growth regulators that promote cell elongation, apical dominance, and rooting. When used as herbicides, synthetic auxins (like 2,4-D) selectively kill broadleaf weeds (dicots) without harming grasses (monocots). This is because monocots are less sensitive to auxin herbicides due to differences in auxin transport, metabolism, and receptor sensitivity. Mature monocotyledonous plants (grasses) are not significantly affected by the concentrations used for weed control. Options A and B are true functions of auxin but do not explain why grass is unharmed. Option D is not the primary reason. Hence, C is correct.Key Concepts: Plant growth regulators – auxins, selective herbicide action (2,4-D), difference in sensitivity between monocots and dicots.

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin: (1) promotes apical dominance. (2) promotes abscission of mature leaves only. (3) does not affect mature monocotyledonous plants. (4) can help in cell division in grasses, to produce growth.

Master NEET with Our Test Series

More Questions from Plant Growth and Development

Frequently Asked Questions

Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin: (1) promotes apical dominance. (2) promotes abscission of mature leaves only. (3) does not affect mature monocotyledonous plants. (4) can help in cell division in grasses, to produce growth.

Master NEET with Our Test Series

More Questions from Plant Growth and Development

Frequently Asked Questions