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Auxins are produced by growing apices of stems and roots.

Auxin was first isolated from avena coleoptiles.

FW Went isolated auxin from tips of coleoptiles of canary grass.

2, 4-D kill monocotyledon weeds.

answer is A.

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Detailed Solution

Auxins are produced by growing apices of stems and roots.

Auxins was first isolated from human urine.

Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedlings.

2, 4-D is widely used to kill dicotyledonous weeds and does not affect mature monocotyledonous plants.

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