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Which one of the following acids is a derivative of carotenoids?

1. Indole-3-acetic acid
2. Gibberellic acid
3. Abscisic acid
4. Indole butyric acid

Correct answer: Abscisic acid

Solution

Abscisic acid is synthesized from carotenoid precursors, so it is a carotenoid derivative. Indole-3-acetic acid and indole butyric acid are auxins derived from tryptophan-related pathways, while gibberellic acid is a diterpenoid, not a carotenoid derivative.

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