NEET BIOLOGY

Detailed explanation-1: -Phytohormones are chemical compounds present in very low concentrations in plants. They regulate plant development, growth, longevity and reproductive processes. Here, let’s look at the structure and functions of different phytohormones like auxins, gibberellins, cytokinins, ethylene and abscisic acid.

Detailed explanation-2: -Auxin and cytokinin are critical growth hormones in plant development and are naturally present within the plant at variable concentrations throughout the season.

Detailed explanation-3: -Hormones respond to increased sunlight competition by stimulating increased stem elongation. Increased competition can cause plants to put more energy into stem elongation growth versus expanded leaf area.

Detailed explanation-4: -As a widely used hormone in plant production, gibberellic acid (GA3) can improve the growth, germination, flowering, and yield, as well as enhance plant-disease resistance (Maurya et al., 2019; Abbasi et al., 2020).

Detailed explanation-5: -There are five groups of plant-growth-regulating compounds: auxin, gibberellin (GA), cytokinin, ethylene, and abscisic acid (ABA). For the most part, each group contains both naturally occurring hormones and synthetic substances.