Auxins are growth hormones caplable of promoting cell elongation. They have been used in horticulture to promote growth flowerin g and rooting wirte a line to explain the meaning of the following terms related to auxins
(a) Auxins precursors ,(b) Anti auxins, (c ) Synthetic auxins

Explanation

Auxin is an improtant plant phytohormone requried for the growth and development of every plant in its life cycle.
(a) Auxin precursoreas are raw materials required to initials synthesis of auxins . IAA is synthesised from tryptophan, adenine compounds and dervatives of carotenoids
(b) Anti auxins are compounds that inhibit action of auxins, e.g p chlorophenoxy isobutyric acid (PCIB), TIBA,
(c ) Synthetic auxin These are synthesised not by plants but artifically by man e.g 2-4 D (weeedicide) , NAA ,dicamba and IBA , (indole Butyric Acid ) which are natureal as well as synethtic