Auxins and Gibberellins — Prelims Strategy

Prelims Strategy

To effectively tackle NEET questions on Auxins and Gibberellins, a multi-pronged strategy is recommended. Firstly, memorize the key physiological effects of each hormone. Create a concise list for auxins (e.

g., cell elongation, apical dominance, root initiation, parthenocarpy, abscission prevention, xylem differentiation) and for gibberellins (e.g., stem elongation, seed germination, bolting, fruit growth, flowering).

Secondly, focus on specific examples and applications. Remember 2,4-D as a selective herbicide (auxin), NAA/IBA for rooting (auxin), IAA for parthenocarpy in tomatoes (auxin), and GA3 for grape enlargement, malting, and reversing dwarfism (gibberellin).

Thirdly, understand the discovery context (Darwin/Went for auxins, Kurosawa for gibberellins from *Gibberella fujikuroi*). Fourthly, pay attention to unique characteristics like the polar transport of auxins and the role of gibberellins in $\alpha$-amylase synthesis.

For conceptual questions, analyze the scenario and link it to the correct hormone's function. For numerical problems (less common here, but possible for concentration effects), ensure units are consistent.

Be wary of trap options that swap the functions of different hormones; a clear distinction between auxin and gibberellin roles is vital.