Question

write important function of different plant hormones?​

Answer 1

Plant hormones are known as phytohormonesin botanical terms. They are chemicals just like animal hormones that help in the growth, development, and functioning of plants. Like animals, plants too are living organisms that function as a unit. They carry out vital biochemical reactions that are required to survive. These biochemical reactions require hormones also known as 'plant growth substances'.

These hormones help in regulation of the plant body by responding to the various signals from the plant and environment.

There are five major hormones which are auxin, cytokinin, gibberellin, abscisic acid, and ethylene. Each hormone differs in its effects. The auxins, gibberellins, and cytokinins act as growth stimulators, whereas, abscisic acid and ethylene act as growth inhibitors.

Auxin

This hormone is present in the seed embryo, young leaves, and apical buds' meristem.

Functions of Auxins:

1) Stimulation of cell elongation, cell division in cambium, differentiation of phloem and xylem, root initiation on stem cuttings, lateral root development in tissue culture

2)Delaying leaf senescence

3)Inhibition or promotion of fruit and leaf abscission through ethylene stimulation.

Cytokinin

They are synthesized in roots and then transported to other parts of the plant.

Functions of Cytokinins:

1)Stimulation of cell division, growth of lateral buds, and apical dominance

2)Stimulation of shoot initiation and bud formation in tissue culture

3)Leaf cell enlargement that stimulates leaf expansion.

Ethylene

Ethylene is present in the tissues of ripening fruits, nodes of stems, senescent leaves, and flowers.

Functions of Ethylene:

1)Leads to release of dormancy state

2)Stimulates shoot and root growth along with differentiation

3)Leaf and fruit abscission.

Abscisic Acid

Abscisic acid is found mostly near leaves, stems, and unripe fruit.

Functions of Abscisic Acid:

1)Stimulation of closing of stomata

2)Inhibition of shoot growth

3)Inducing seeds for synthesizing storage of proteins.

Gibberellin

Gibberellins are present in the meristems of apical buds and roots, young leaves, and embryo.

Functions of Gibberellins:

1)Stimulates stem elongation

2)Leads to development of seedless fruits

3)Delays senescence in leaves and citrus fruits.

Hope this finds useful to you!!!

Answer 2

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THERE ARE DIFFERENT TYPES OF PLANT HORMONE :-

Auxins :-

1. It's help in cell enlargement and cell differentiate.

2. it is synthesized at the shoot and root tip.

3. itit controls the phototrophic behaviour of a plant or control geotropic behaviour of plant.

Gibberellin:-

1. It promote cell enlargement in the presence of auxin.

2. lt promote cell division and stimulates stem elongation.

3. lt stimulates seed germination by breaking seed dormancy.

Cytokinins:-

1. It help in cell division cell enlargement and cell differentiate.

2. it also promote breaking seed dormancy.

Ethylene:-

1. It promote ripening of fruit .

2. It is gaseous hormone that has inhibitory effect on growth.

Abscisic Acid:-

1. It promote witling of leaves.

2. Growth inhibitory hormone .