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What are plant harmone? Name any two. |
| Answer» Auxin 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. They play a vital role in:\tAuxin helps in cell enlargement by increasing the plasticity of the cell wall.\tAuxin helps in promoting the growth of the plant’s tissue.\tAuxin is responsible for 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.\tAuxin controls the aging and senescence of plants.\tAuxin helps in promoting the growth of many fruits without fertilization.\tAuxin helps in delaying the shedding of leaves.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.\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.\tCytokinins are also involved in promoting chloroplast maturation. | |