Auxin Questions in English

(A) The correct answer is $A$.
Apical dominance is the phenomenon where the growing apical bud suppresses the growth of lateral or axillary buds.
This process is primarily regulated by the phytohormone $Auxin$,which is synthesized at the shoot apex and transported downwards,inhibiting the development of axillary buds.

(A) $2,4-D$ ($2,4$-dichlorophenoxyacetic acid) is a synthetic auxin. It is widely used as a herbicide to kill broad-leaved weeds. It does not affect mature monocotyledonous plants, which makes it useful for protecting cereal crops from weeds.