Question

Name any three phytohormonnes. Mention their functions.

Answer 1

Auxin: It was the first plant Hormone.
It promotes Cell elongation,
synthetic auxin like 2,4-dichlorophenoxy acetic acid is used to eradicate weed.
Promotes Cell division in cambium.

Gibberllins:
Promotes elongation of stem.
Breaks dormancy in potato.

Abscisic Acid:
Promotes abscission.
Growth Inhibitor.





Other examples of phytohormones are Cytokinin, Ethylene.

Answer 2

The three phytohormones along with their functions are as follows----

1) AUXIN --

i) It promotes cell enlargement.
ii) It promotes cell differentiation.
iii) It promotes fruit growth and parthenocarpy.

2) GIBBERELLIN --

i) It promotes cell enlargement and cell differentiation in presence of auxins.
ii) It helps in breaking the dormancy in seeds.
iii) It helps in growth of fruits.

3) CYTOKININ --

i) It promotes cell division in plants.
ii) It prevents senescence ( ageing) of leaves.
iii) It also helps breaking seed dormancy.
iv) It promotes parthenocarpy and helps in opening of Stomata.