Question

3-3 functions of 5 plant hormones. class 10th

Answer 1

Plant hormones are of four types:-

1- Auxin

2-Gibberllin

3-Cytokinin

4-Abscisic acid

1-(a) Auxin are the hormones usually synthesized in the growing tips of roots and shoots help them to grow longer.

(b) They promotes cell elongation and cell division.

(c) It reduce the dormancy in seeds.

(d) Help in the formation of roots and seedless fruits.

2-(a) Cytokinin is a growth promoter.

(b) It reduce the dormancy in seeds.

(c) Promotes cell division.

3-(a) Help in the growth of stem and root.

(b) Also responsible for the growth of flowers.

(c) Gibberellin is a growth promoter.

4-(a) They inhibit the growth.

(b) It promote dormancy in seeds.

(c) It inhibit cell division and cell elongation.

Answer 2

Explanation:

Auxin : -

1. they are synthesized in the tip of the shoot.
2. It helped them(plants) to grow longer.
3. Plants for bending towards sunlight because Auxin diffuses towards the the shady side of the shoot in stimulating the cell to grow longer .

Gibberellins :-

1. we are the hormone that help in the plant growth in stem.
2. it helps in the growth of plant's flower
3. it along the stem but not the curvature ( it doesn't helps in flattening)

Cytokinin:-

1. it helps in cell division
2. it is used in secondary growth
3. it increases the thickness ( width) of the plant

Aisicesic :-

1. it is a growth inhibitor
2. it is responsible for the wilting of leaves
3. it is also known as dormin or stress hormone
4. it inhibits growth
5. it is used in dormancy of seeds

Dormancy :- deactivating

Ethylene:-

1. it is the only gaseous hormone
2. it is auto catalyst in nature
3. higher concentration of auxin promotes function of Ethylene