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Which of the following is a synthetic auxin rather than one naturally produced by plants?
AIndole-3-Acetic Acid (IAA)
BPhenyl Acetic Acid (PAA)
CIndole-3-Acetonitrile (IAN)
D2,4-Dichlorophenoxy Acetic Acid
Answer & Solution
Correct answer: D. 2,4-Dichlorophenoxy Acetic Acid
1. Natural auxins are made by plants and include IAA, PAA and IAN.
2. Synthetic auxins are made artificially but act like auxins.
3. 2,4-D (2,4-Dichlorophenoxy Acetic Acid) is an artificially synthesised auxin.
4. IAA, PAA and IAN are all natural, so they are ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 16 Plant and Animal Hormones "Types of Auxins", p.237_
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