The one which is a weed killer is___________?
Correct answer: C. 2 4-D
- A. IAA
- B. NAA
- C. 2 4-D
- D. GA
Explanation
2,4-D is a synthetic auxin that acts as a selective herbicide, especially against many broad-leaved weeds. IAA and NAA are auxins mainly discussed as natural or synthetic plant-growth regulators, while GA is gibberellic acid and promotes growth. Students may choose IAA because it is an auxin, but it is not the standard weed killer named here.
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