Explain the Phytohormones which control growth in plants.

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Solution

Major plant hormones and their action:

Hormones Uses

Auxins Cell elongation and differentiation of shoots and roots.

Cytokinins Promote cell division, promotion of sprouting of lateral buds, delaying the ageing in leaves, opening of stomata.

Gibberellins Germination of seeds and sprouting of buds; elongation of stems; stimulation of flowering; development of seedless fruits, breaking the dormancy in seeds and buds.

Abscisic acid Closing of stomata; seed dormancy, promoting aging of leaves.

Ethylene Ripening of fruit.

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Plant growth movements are induced by phytohormones.

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Hormones	Uses
Auxins	Cell elongation and differentiation of shoots and roots.
Cytokinins	Promote cell division, promotion of sprouting of lateral buds, delaying the ageing in leaves, opening of stomata.
Gibberellins	Germination of seeds and sprouting of buds; elongation of stems; stimulation of flowering; development of seedless fruits, breaking the dormancy in seeds and buds.
Abscisic acid	Closing of stomata; seed dormancy, promoting aging of leaves.
Ethylene	Ripening of fruit.