BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Auxin and cytokinin are critical growth hormones in plant development and are naturally present within the plant at variable concentrations throughout the season. Their presence and activity are different from other hormones which act more in an on-off manner and are present only at specific times.

Detailed explanation-2: -Apart from these, plants also need certain organic compounds to signal, regulate and control their growth. These are known as the Plant Growth Regulators or Hormones or Phytohormones. Plant growth regulators are the chemical substances that control the aspects of growth and development within the plants completely.

Detailed explanation-3: -Plant growth regulators (PGRs) are natural or synthetic compounds with hormone-like activities. Like hormones, PGPRs act as chemical messengers for intercellular signaling and play a fundamental role in plant growth and development and response mechanisms to a wide range of abiotic and biotic stresses.

Detailed explanation-4: -Abscisic acid is a plant growth hormone involved in seed dormancy by suppressing seed germination and growth as well as in responses of plants to stress.