Question

how chemical coordination occur in plant?define 5 thpes of hormone by giving simple defination?

Answer 1

chemical coordination In plant occurs buy the help of phytohormones.
these hormones are:-
1. AUXIN
Auxin helps in cell enlargement by increasing the plasticity of the cell wall.

Auxin helps in promoting the growth of the plant’s tissue.

Auxin is responsible for phototropism and geotropism.

2. CYTOKININS
Cytokinins are involved in promoting cell division (cytokinesis) hence it is referred to as   Cytokinins. Zeatin is a naturally occurring plant growth hormone, which is isolated from corn plant. Cytokinins are present in all cell division sites including root tips, leaves, fruits, and seeds.

3. GIBRELLIN
Gibberellins help in controlling the elongation of the stem in young shoots.

Gibberellins help in seeds germination, enzyme production and food production, which is required for the new cells to grow.

4. ETHYLENE
Ethylene helps in stimulating fruit ripening and determining the sex of a flower.

5. ABSICIC ACID
Abscisic acid helps in promoting bud dormancy and senescence of leaves.

Abscisic acid helps in the closing of stomata during Transpiration.

Abscisic acid inhibits detachment of plant parts.

Abscisic acid plays an important role in seed development, maturation and dormancy.




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