alleryWhich 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_
Keep practising Unit 4A: Cell Communication & Signal Transduction
Browse all Unit 4A: Cell Communication & Signal Transduction questions for AP Biology, or explore more Biology topics.
Related questions
Excess production of growth hormone before adulthood mainly causes:A student is suddenly chased by a stray dog. The hormone that quickly readies the body forA child has been diagnosed with cretinism. The most likely cause is:A salivary gland is best classified as a / an:Hormones travel from an endocrine gland to their target organ through:Cortisone, a stress-management hormone, is secreted by the:Dwarfism results from the under-secretion of which hormone during childhood?Glucagon, also a pancreatic hormone, does the opposite of insulin. It: