Question

what r plant hormones [photo-hormones]? write the function of each plant hormone.

Answer 1

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The chemical substances that are naturally produced in plants and are capable of regulating the important process of plants are called phytohormones or plant hormones.

Major classes of plant hormones and their effect:


1. Auxin : The hormone usually synthesized in the young tip of roots and shoots helping them grow longer. It promotes cell elongation and division. It helps in the formation of roots and seedless fruits.



2. Gibberellin : The hormones that help in the growth of the stem and flower.


3. Cytokinins : The hormones which promote cell division and delay ageing in leaves. The application of cytokinins reduces apical dominance and also stimulates the leaf expansion. It also helps in opening of stomata.


4. Abscisic Acid: It is like a growth inhibitior hormone that reverses the growth promoting effects of auxins and gibberellins.


5. Ethylene : A gaseous hormone that acts at trace levels throughout the life of the plant. It is also known as ripening hormone.


I hope you understand dear friend !!!.

Answer 2

Plant hormones are organic substances produced naturally in higher plants. They control growth and other physiological functions of the plants. These are required in very small amounts.

There are 5 plant hormones:

1) Auxin: growth is the function of auxin, cell elongation, parthenocarpy, leaf and fruit fall, respiration

Parthenocarpy is a fruit without fertilization and without seeds.

2) Cytokinin: helps in cell division

It is high in shoot epicals compared to root epicals.

3) Gibberellins: elongation of stem, parthenocarpy, seed germination, breaking of dormancy, reversal dwarfism.

4) Ethylene: Induces ripening of fruit, inhibits elongation. It also acts as a stimulator. Suppresses bud growth, stimulates flowering and controls auxin level in the tissues. It has overall inhibitory effect on growth.

5) Abscisic Acid (Aba): bud dormancy, inhibition of growth, promotes leaf fall.

Hope It Helps!!!