A) Amo-1618
B) Phosphon-D
C) Malic hydrazide
D) 2, 4-D
Correct Answer: D
Solution :
2, 4-D (2, 4 dichiorophenoxy acetic acid) is an auxin hormone. It over stimulate the growth activities of the cells of the root due to which roots get destroyed and thus plants finally destroy. 2, 4-D is used as a defoliant for broad leaved dicots (mainly weeds).
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