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Name and functions of plant hormone

Answer» There are five different types of plant growth regulators.Auxin:\tAuxin helps in cell enlargement by increasing the plasticity of the cell wall.\tAuxin helps in promoting the growth of the plant’s tissue. Auxin is responsible for the phototropism and geotropism.\tAuxin helps in promoting root initiation and stem cutting in plants.\tAuxin inhibits the growth of lateral bud by stimulating the production of ethylene.Cytokinins\tCytokinins help in stomatal opening.\tCytokinins help in delaying the senescence of leaves.\tCytokinins promote the expansion of cotyledons.\tCytokinins are involved in the enlargement of stem cells.Gibberellins\tGibberellins help in controlling the elongation of the stem in young shoots.\tGibberellins help in seeds germination, enzyme production and food production, which is required for the new cells to grow.\tGibberellins help in increasing the number of fruits, the size of a fruit and also delay the ripening of fruits in citrus plants.\tGibberellins are also involved in seed germination.Ethylene\tEthylene helps in stimulating fruit ripening and determining the *** of a flower.\tEthylene is involved in the production of female flowers in a male plant.\tEthylene helps in the root initiation of plants.\tEthylene increases the speed of senescence.Abscisic acid\tAbscisic acid helps in promoting bud dormancy and senescence of leaves.\tAbscisic acid helps in the closing of stomata during Transpiration.\tAbscisic acid inhibits detachment of plant parts.\tAbscisic acid plays an important role in seed development, maturation and dormancy.


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