Q. 2,4-D, which is sold as a weed killer of the broad-leaved weeds is a synthetic version of __: 
Answer: Auxin Hormone
Notes: 2,4-dichlorophenoxyacetic acid (2,4-dichlorophenoxyethanoic acid) is a synthetic auxin frequently used as a weed killer of broad-leaved weeds. When two herbicides 2,4,5-T and 2,4-D and mixed in equal parts, it is called Agent Orange, which was used by US in Vietnam war.

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