Question

write the types of plant hormones with function and location in word​

Answer 1

Plant Hormones are classified into the following on the basis of location and function:

Auxin

• Auxin is present on the growing tips of roots and shoots
• Help in elongation of the plant
• Help in food synthesis and respiration

Gibberellins

• Gibberellins are found in plastids of the leaf
• They help in plant cell elongation
• Faster fruit ripening

Cytokinin

• Found on the dividing parts of the plant body
• Causes cell multiplication by cytokinesis
• Help lateral buds to overcome the apical dominance and grow

Abiscisic Acid

• Cause dormancy and prevent fruit and flower growth
• Induce the effects of auxin and gibberellins

Answer 2

Answer:

In plants, growth, development, and response to the environment is controlled and coordinated by a special class of chemical substances known as phytohormones. There are five major types of phytohormones: auxins, gibberellins, cytokinins, abscisic acid, and ethylene. These phytohormones are either growth promoters such as auxins, gibberellins, cytokinins, and ethylene, or growth inhibitors such as abscisic acid.

Auxins

When the growing parts of a phototropic plant detect sunlight, auxins (synthesized at the shoot tips) help the cells grow longer. When light falls on one side of the plant, the auxins generally diffuse towards the shaded side of the shoot. This stimulates the cells in the shaded area to grow longer than the corresponding cells of the illuminated region. This results in the curvature of the plant stem tip towards the light.

Gibberellins

They are produced in the roots of a plant. They promote stem elongation by promoting cell division in the inter-nodal region.

Cytokinin

They promote cell division. Therefore, they are present in greater concentration in those areas of the plants where rapid cell division occurs. For example, tip of the shoot.

Abscisic acid

It promotes seed dormancy by inhibiting cell growth. It is involved in the opening and closing of stomata. It is also responsible for the shedding of leaves.

Ethylene

It regulates fruit ripening. It is produced during the ripening of fruits.

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