Question

State the functions of plant hormones of Auxin , Gibberellin and Cytokinin ​

Answer 1

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Plant hormones help to coordinate growth, development and responses in environment.

Four different types of plant hormones are – Auxins, Gibberellins, Cytokinins, Ethylene and Abscisic acid.

Auxin :

Auxins control the tropic (growth related) movements of the plants in response to light, gravity, touch etc by increasing the size of cells. Under the influence of auxins, the plant stem bends towards unidirectional light where as the roots bend away from it.

Gibberellins :

Gibberellins stimulate stem elongation and leaf expansion. Its application causes stem elongation in small plants such as cabbage. Spraying gibberellins on sugarcane plant increases the stem size and hence the yield.

Cytokinins :

Cytokinins are produced in regions of the plant body where rapid cell division occur, such as root tips, developing shoot buds, young fruits and seeds. Cytokinins promote growth by stimulating cell division.

Answer 2

Question:-

State the functions of plant hormones of Auxin, Gibberellin and Cytokinin.

Answer:-

Functions of Auxin : Cell enlargement, apical dominance, prevention from bending; promote xylem differentiation, healing of wounds of plants.

Functions of Gibberellin : Promote increase in fruit size, inter-nodal elongation, seed germination.

Function of Cytokinin : Promote cell division, apical dominance, delay in senescenes ( aging ), phloem transport, accumulation of salts in cells, production of female flowers, increase resistance to extreme temperatures and diseases.