One of the synthetic auxin is - DASH

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One of the synthetic auxin is

IAA

GA

IBA

NAA

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Step-by-Step Explanation 1. Understanding Auxins Auxins are a class of plant growth regulators primarily responsible for cell elongation and various developmental processes such as apical dominance and root initiation. They are produced naturally in plants but can also be synthesized chemically. 2. Difference Between Natural and Synthetic Auxins • Natural auxins (e.g., Indole-3-Acetic Acid, IAA) are produced within plant tissues. • Synthetic auxins are chemical compounds that mimic the action of natural auxins in plants but are artificially manufactured. 3. Examples of Synthetic Auxins Several chemicals have been developed that act as synthetic auxins, including: • $1$–naphthaleneacetic acid (NAA) • $2,4$–dichlorophenoxyacetic acid (2,4-D) • $2,4,5$–trichlorophenoxyacetic acid (2,4,5-T) These compounds mimic the growth-promoting effects of natural auxins and are often employed in agriculture, for instance, in rooting hormones or weed control. 4. Conclusion NAA (1–naphthaleneacetic acid) is a widely recognized synthetic auxin used to encourage rooting in cuttings and serve as a weed killer. Hence, Option 4 (NAA) is the correct answer.

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