Question

------- is an auxin

• A. 2,4 -dichlorophenoxyacetic acid
• B. Napthalene acetic acid
• C. Both (A) and (B)
• D. Abscissic acid

Answer 1

The correct option is C Both (A) and (B)

NAA is a synthetic plant hormone in the auxin family and is an ingredient in many commercial plant rooting horticultural products; it is a rooting agent and used for the vegetative propagation of plants from stem and leaf cutting. It is also used for plant tissue culture. The hormone NAA does not occur naturally and like all auxins is toxic to plants at high concentrations. 2,4-D is also called as 2,4-dichlorophenoxy acetic acid which is also a synthetic auxin which can act as herbicide. it was used as defoliating agent as 'agent orange' during Vietnam war.