NEET BIOLOGY

Detailed explanation-1: -Phytohormones or plant hormones, are naturally occurring small organic molecules or substances which influence physiological processes in plants at very low concentrations (Davies, 2004). In other words, phytohormones are chemical messengers that coordinate cellular activities of plants (Fleet and Williams, 2011).

Detailed explanation-2: -Hormones are special chemical messengers molecules that help organisms, including plants, respond to stimuli in their environment. Ethylene is an unusual plant hormone because it is a gas.

Detailed explanation-3: -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: -Plant hormones control all aspects of plant growth and development, from embryogenesis, the regulation of organ size, pathogen defense, stress tolerance and through to reproductive development.

Detailed explanation-5: -Plant hormones include auxin, abscisic acid, ethylene, gibberellins, cytokinins, salicylic acid, strigolactones, brassinosteroids, and nitrous (nitric) oxide.