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Auxins are growth hormones capable of promoting cell elongation. They have been in horticulture to promote growth, flowering, and rooting. Write a line to explain the meaning of the following terms related to auxins.

(a) Auxin precursors
(b) Anti-auxins
(c) Synthetic auxins

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Ans.

(a) Auxin precursors are the raw substances utilised in the process of initial making and synthesis of auxins. For example- IAA's auxin precursor is tryptophan.
(b) Anti-auxins are compound substances which restrict the action of auxins. For example, TIBA and p-chlorophenoxy isobutyric acid (PCIB).
(c) Synthetic auxins are auxins which are artificially synthesised and do not occur naturally in plants. For example,  2:4-D, NAA.

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