Auxin|Plant Hormones Auxins|Plant Growth And Development | Class 11 Biology|NEET 2023|Ekdantam NEET

Auxin|Plant Hormones Auxins|Plant Growth And Development | Class 11 Biology|NEET 2023|Ekdantam NEET| Auxin class 11th | 11th ncert biology|NEET 2023|NEET 2024|NEET biology Shorts| NEET biology Auxin Short| class 11th Plant Growth And Development|Cbse biology shorts

Hello everyone welcome to our you tube channel , In this you tube short video we discussing about the Auxin which is the 1st Plant Growth Hormone , its origin and its importance so watch the whole video and clear your concept for compitetive preparation.


Auxins are a group of naturally occurring and artificially synthesised plant hormones. They play an important role in the regulation of plant growth. Auxins were initially isolated from human urine.

Auxin means to “enlarge” or “increase”. They induce cell division, differentiation and elongation.

Charles Darwin detected phototropism movement (bending of plants towards light) in the coleoptile of canary grass. He observed that there was some influencer at the tip of the coleoptile, which was responsible for the bending towards the light.

Later, Frits Went isolated and named the substance as “Auxin”, which was responsible for phototropic movement in oat coleoptile.

Kenneth Thimann purified and elucidated the structure of primary auxins, e.g. IAA (Indoleacetic acid).

Naturally Occurring Auxins: Indole-3-acetic acid (IAA), Indole butyric acid (IBA)

Artificially synthesized Auxins: 2,4-dichloro phenoxy acetic acid (2,4-D), Naphthalene acetic acid (NAA)

Auxin Function
Cell Elongation: Auxin promotes elongation in shoots and coleoptiles. Plasticity of the cell wall is increased by acidification
Cell Division and Differentiation: Auxin promotes healing. It helps in cell differentiation and regeneration of vascular tissues (phloem, xylem)
Callus Formation and Morphogenesis: Auxin along with cytokinin induces callus formation in explant and stimulates morphogenesis
Secondary Growth: Auxin promotes secondary growth and induces cell division in the vascular cambium
Root Initiation on Cuttings: For asexual propagation, NAA is used to initiate root formation in the stem cuttings
Apical Dominance: When the growth of apical meristem inhibits the growth of axillary buds, the phenomenon is known as apical dominance. When the shoot tip is removed, it induces the growth of lateral buds. This is used to promote branching, e.g. in hedge-making and tea plantations.


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