BIOMOLECULES AND ENZYMES

Detailed explanation-1: -(i) In light, hormone auxin, helps the cells to grow longer in plants. (ii) Plant hormone gibberellins help in growth of a stem. (iii) Cytokinin inhibits cell division. (iv) Abscisic acid promotes growth in plants.

Detailed explanation-2: –So there is a hormone that behaves as an antagonist to the Abscisic acid which is gibberellins.-Gibberellins is also a plant hormone, where it Regulates the various developmental processes.

Detailed explanation-3: -Conversely, CK, ethylene, JA and SA are hormones that inhibit cell division in the PD/MZ.

Detailed explanation-4: -Abscisic acid (ABA) is accepted as one of the five major classes of natural plant growth regulators. In many tests ABA inhibits growth and metabolism, and enhances degradative changes, as in ripening and senescence.

Detailed explanation-5: -Abscisic acid (ABA) is a phytohormone known as the “stress hormone”. ABA signaling mediates many types of abiotic stresses, such as drought, salinity, heat and cold stress. In roots, ABA plays an essential role in inhibiting cell division and elongation in response to soil conditions.