Question

Which auxin should be used to irradiate dicotyledonous weeds from a monocotyledonous crop field?

• A. 2,4-D
• B. IBA
• C. IAA
• D. NAA

Hint:

2,4-D is a synthetic auxin used as a selective herbicide, mainly effective against dicotyledonous weeds.

Answer 1

The Correct Option is A

Step 1: Understanding the effect of auxins.
Auxins are plant hormones used to regulate plant growth. 2,4-D is an auxin commonly used as an herbicide to target dicotyledonous plants. It mimics the action of natural auxins but causes abnormal growth that leads to the death of dicotyledonous weeds.
Step 2: Analyzing the options.
(A) 2,4-D: Correct, 2,4-D is an auxin commonly used to control dicot weeds in monocot fields.
(B) IBA: Incorrect, IBA is a natural auxin but is primarily used for rooting, not for killing weeds.
(C) IAA: Incorrect, IAA is a natural auxin but not effective as a herbicide in this context.
(D) NAA: Incorrect, NAA is used for root initiation but not for weed control.
Step 3: Conclusion.
The correct answer is (A) 2,4-D, as it is an effective herbicide for dicotyledonous weeds in monocotyledonous fields.