PLANT HORMONES CLASS 10:

THERE ARE MAINLY FIVE TYPES OF PLANT HORMONE:
1. AUXINS
2. GIBBERELLINS
3. CYTOKININS
4. ABSCISIC ACID
5. ETHYLENE

1. AUXINS:
a) Plant Growth Hormone.
b) Found in Apical Region of Plants.
c) Light Sensitive hormone.

2. GIBBERELLINS:
a) It helps in the growth of Stem and Fruits.
b) It helps in cell enlargement and cell differentiation.

3. CYTOKININ : (CYTO: CELL ; KININ: DIVISION)
a) It promotes Cell Division.
b) It is found in seed and fruit.

4. ABSCISC ACID:
a) It prohibits the growth of Plants.
b) It is a Growth Controlling Hormone.

5. ETHYLENE:
It helps in the ripening of fruits.

IMPORTANT QUESTIONS:

1. The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:

(a) Auxin

(b) Gibberellin

(d) Cytokinin

Answer. (c) Abscisic acid

2. The main function of the plant hormone called abscisic acid is to:

(a) Increase the length of cells

(b) Promote cell division

(d) Promote growth of stem and roots

Answer. (c) Inhibit growth

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