NEET BIOLOGY

Detailed explanation-1: -Generally, there are five types of plant hormones, namely, auxin, gibberellins (GAs), cytokinins, abscisic acid (ABA ) and ethylene. In addition to these, there are more derivative compounds, both natural and synthetic, which also act as plant growth regulators.

Detailed explanation-2: -Plants produce a chemical messenger, called abscisic acid, to alert the rest of the plant that it is water stressed. Abscisic acid is made in droughted leaves, droughted roots, and developing seeds and it can travel both up and down in a plant stem in the xylem or phloem sounding the alarm.

Detailed explanation-3: -Plant hormones are for a long time known to act as chemical messengers in the regulation of physiological processes during a plant’s life cycle, from germination to senescence. Furthermore, plant hormones simultaneously coordinate physiological responses to biotic and abiotic stresses.

Detailed explanation-4: -Phytohormones are the substances that regulate the growth, development, and physiology of plants.

Detailed explanation-5: -Hormones are called chemical messengers because they are chemical agents that go around the body to tell particular cells to play out a specific action.