Which one of the following acids is a derivative of carotenoids? A. Indole-butyric acid B. Indole-3-acetic acid C. Gibberellic acid D. Abscisic acid
Option D. Abscissic acid (ABA) is commonly formed inside the chloroplast from mevalonic acid or xanthophyll. Chloroplasts in leaves contain the carotenoids from which ABA arises.
