1.

Explain the Phytohormones which control growth in plants.

Answer»

Major plant hormones and their action:

Hormones AuxinsUses Cell elongation and differentiation of shoots and roots.
CytokininsPromote cell division, promotion of sprouting of lateral buds, delaying the ageing in leaves, opening of stomata.
GibberellinsGermination of seeds and sprouting of buds; elongation of stems; stimulation of flowering; development of seedless fruits, breaking the dormancy in seeds and buds.
Abscisic acidClosing of stomata; seed dormancy, promoting aging of leaves.
EthyleneRipening of fruit.



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