Discussion
Dicotyledonous weeds are destroyed by a chemical called
Answer: B
Dicotyledonous weeds are killed by 2,4-dichlorophenoxyacetic acid, or 2,4-D.
It is a synthetic auxin that throws the plant's growth into disorder. It is selective because monocots - the cereals - metabolise it quickly, so a cereal field can be sprayed to kill the broadleaved weeds in it.
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