Question

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Q.Name and functions of all 5 plant hormones please

Class - 10 Biology (Control and Coordination)

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Answer 1

Cytokinins

1 . cytokinins promote cell division and cell elongation .

2. they help in promoting growth.

3. overcome seed dormancy of various types.

4. plant part are formed by the effect of cytokinin.

Abscisic acid

1. cause wilting of leaves and inhibits growth.

2. controls the process of opening and closing of flower and leaves.

Auxins

1. it promotes cell enlargement and division.

2. it initiates root formation on stem cutting.

3. produces tropic plant responses like phototropism and geotropism.

4. control plant growth.

5. prevent falling of leaves .

Gibberellin

1.stimulate stem elongation and leaf expansion.

2. they also promote seed germination and fruit growth.

Answer 2

Auxins- Helps in the growth of root and shoot tips. Plays an important role in developing a seedless fruit.

Gibberallins- Helps in vegetative propagation. It stimulates stem elongation and seedless fruits.

Cytokinins- Promotes cell division and also helps in breaking down the dormancy of seeds.

Abscissic acid- Inhibits growth and causes wilting(falling) of leaves.

Ethelene- Stimulates or regulates ripening of fruits, opening of flowers,etc.