Question

IAA is not the only naturally occurring auxins. Give reason. ​

Answer 1

Answer:

Indole-3-acetic acid (IAA) has now been identified in a great variety of higher plants including the Avena coleoptiles by using chromatographic, chemical and colourimetric methods, and is considered to be the only true natural auxin of the higher plants.

Explanation:

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Answer 2

Answer:

Synthetic. IAA is the most abundant naturally occurring auxin in plants. It is synthesized from the amino acid L-tryptophan in leaf primordia, young leaves and developing seeds. Although naturally occurring, IAA is not commonly used in propagation because it breaks down quickly in the plant.

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