Write the physiological effect of Auxin.

Explanation

Auxins bring about a variety of physiological effects in different parts of the plant body.
Some of them are discussed below:
(i) Auxins promote the elongation of stems and coleoptiles which makes them to grow.

(ii) Auxins induce root formation at low concentration and inhibit it at higher concentration.
(iii) The auxins produced by the apical buds supress growth of lateral buds. This is called Apical Dominance.
(iv) Seedless fruits without fertilization are induced by the external application of auxins. (Parathenocrapy). Eg: Watermelon , Grapes, Lime etc.
(v) Auxins prevent the formation of abscission layer.