NEET BIOLOGY

Detailed explanation-1: -Answer: Auxin promotes cell growth and elongation of the plant. In the elongation process, auxin alters the plant wall plasticity making it easier for the plant to grow upwards. Auxin also influences rooting formations.

Detailed explanation-2: -Auxin promotes dormancy and inhibits germination by enhancing ABA action, thereby adding another protective level of control in the regulation of seed dormancy.

Detailed explanation-3: -Auxins also play a role in cell division and differentiation, in fruit development, in the formation of roots from cuttings, in the inhibition of lateral branching (apical dominance), and in leaf fall (abscission).

Detailed explanation-4: -Auxin is the plant hormone concerned with apical dominance, phototropism and growth. Whereas photosynthesis is a light dependent anabolic process which is never dependent on auxin hormone.

Detailed explanation-5: -Gibberellins (GAs) break seed dormancy and promote germination (1, 2), and several other hormones, including brassinosteroids, ethylene, and cytokinin, have also been shown to promote seed germination (3, 4). However, abscisic acid (ABA) is the only hormone known to induce and maintain seed dormancy.