Plant Growth and Development Question 29

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

(a) Indole-3 -acetic acid

(b) Gibberellic acid

(c) Abscisic acid

(d) Indole butyric acid

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Answer : c

Hints & Solutions

(c) Abscisic acid (ABA), also known as abscisin II and dormin, is a plant hormone. It functions in many plant developmental processes, including bud dormancy. Abscisic acid is a derivative of carotenoids. It was called “abscisin II” originally because it was thought to play a major role in abscission of fruits. At about the same time another group was calling it “dormin” because they thought it had a major role in bud dormancy. The name abscisic acid (ABA) was coined as a compromise between the two groups.



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