NEET BIOLOGY

Detailed explanation-1: -Plant hormones regulate plant growth, development, reproductive processes, longevity, and death. Six main types: Auxins, abscisic acid, cytokinins, ethylene gibberellin, and brassinosteroids. Recent additions: Jasmonates and strigolactones.

Detailed explanation-2: -These are called plant hormones or “Phytohormones”. Plant hormones are chemical compounds present in very low concentration in plants. They are derivatives of indole (auxins), terpenes (Gibberellins), adenine (Cytokinins), carotenoids (Abscisic acid) and gases (Ethylene).

Detailed explanation-3: -Summary. Phytohormones are chemical messengers that coordinate cellular activities. This lecture introduces the plant hormones (auxin, cytokinin, gibberellic acid, brassinosteroids, ethylene, abscisic acid, salicylic acid and jasmonic acid) through their roles, during the plants life, from seed-to-seed.

Detailed explanation-4: -Chemical substances secreted by the plants that regulate the growth and development of plants are phytohormones or plant growth regulators. For example-∙ Auxin-This is the growth hormone secreted at the tip of the shoot and root. It promotes linear growth of the plant.