Agar is an extract from _______? (IFFCO 2022)

✅Explanation:
Indole-3-acetic acid (IAA) is indeed the most abundant and fundamental naturally occurring auxin found in plants.
-Natural Occurrence: IAA is produced by plants themselves, primarily in actively growing regions like shoot tips, young leaves, and developing seeds.
-Cell Elongation: IAA stimulates cell elongation, contributing to stem and root growth.
-Apical Dominance: It promotes the growth of the main stem while suppressing the growth of lateral buds.
-Tropisms: IAA plays a role in plant responses to light (phototropism) and gravity (gravitropism).
-Root Development: It promotes the formation of adventitious roots (roots that develop from stems or leaves).
-Fruit Development.
-Precursor to Other Auxins: Some plants convert IAA into other auxins, such as IBA (indole-3-butyric acid).

🔑Key Points:
-Indole-3-acetic acid (IAA, 3-IAA) is the most common, naturally occurring, plant hormone of the auxin class.
-IAA is predominantly produced in the apical bud of and young leaves of plants and is known to be an inducer of cell division and elongation. 
-IAA, as well as most other auxins, are also known to act in concert with, or in opposition to, other plant hormones.
-Example: The ratio of auxin to cytokinin in certain plant tissues determines initiation of root versus shoot buds.