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What are plant hormone ? and define it all

Answer» Plant hormones are chemicals that regulate plant growth.Plant hormones are signal molecules produced within the plant, and occur in extremely low concentrations.Plant hormones can be defined as a chemical messenger, which plays a vital role in controlling the entire life process and other activities in the plant cell like seed germination, ripening of the fruit, growth, flowering and lot more.A plant hormone is also referred as phytohormones. Drought, nutrients, temperature, light, and stress are the environmental factors that affect the production of plant growth hormone.Auxin :It is also referred as IAA- indole-3-acetic acid. It was the first phytohormones to be recognized. This plant growth regulator plays an important role in the growth and development of a plant.\xa0Cytokinins: Cytokinins are involved in promoting cell division (cytokinesis) hence it is referred to as Cytokinins. Zeatin is a naturally occurring plant growth hormone, which is isolated from corn plant. Cytokinins are present in all cell division sites including root tips, leaves, fruits and seeds.Gibberellins: Gibberellins are the most abundantly found hormone in plants. There are more than 70 gibberellins isolated. They are GA1, GA2, GA3 and so on. The GA3 Gibberellic acid is the most widely studied plant growth regulators.Ethylene: Ethylene is an organic compound and gaseous substance, which is produced from amino acid. It is present in large amount and is mainly produced by plants that are under stress. Ethylene helps in stimulating fruit ripening and determining the *** of a flower.Abscisic acid: It is a chemical messenger produced by other parts of a plant to indicate whether the plant is experiencing water stress, this signaling is mainly produced by drought roots and leaves.


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