Question

write about phytohormones in explain?

Answer 1

Phyto hormones (Plant hormones) are the chemicals produced by plants the co-ordinate their growth and functioning

There are 5 phyto hormones:-

i.) Auxin :- It helps in the growth of stem

ii.) Gibberelins:- They promote germination of seeds

iii.) Cytokinins :- They help in cell division

iv.) Abscisic acid :- It inhibits growth and promotes falling of leaves

v.) Ethyne or Ethylene :- It helps in ripening of fruits

Hope it helps u...........

Answer 2

Hi,
Here is the answer to your query:-

Phytohormones are also called plant hormones. Plant hormones are signal molecules produced within plants, that occur in extremely low concentrations. They exert strong control over plant development and can either act locally or in more distant part of the plant.They are of Four types-
1)Auxin- It is a growth promoters. They are synthesized at the shoot tio of the plant. It promotes the cell elongation, root formation, cell division, respiration and other physiological processes like protein synthesis, water uptake and protoplasmic permeability.
2)Gibberellins- It stimulate stem elongation, seed germination and flowering.The maximum concentration of gibberellins is found in fruits and seeds.
3)Cytokinins- They are produced in dividing cells throughout the plant. In mature plants, cytokinins are produced in the root tips and are transported to the shoots. Cytokinins promote cell division and also help in breaking the dormancy of seeds and buds and regulate the phloem transport. Cytokinins delay the ageing in leaves and promote the opening of stomata.
4)Abscisic Acid- It is a growth inhibtor which reverses the growth-promoting effects of auxins and gibberellins. Its effect include wilting of leaves. It causes dormancy of seeds. It also promote the closing of stomata.

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@SHIVAM