Question

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

• A. Indole Butyric acid
• B. Abscisic acid
• C. Gibberellic acid
• D. Indole-3-acetic-acid

Answer 1

The correct option is B

Abscisic acid

The correct option is B.

Explanation of correct option:

1. Abscisic acid (ABA) is a plant hormone that is also known as abscisin II or dormin.
2. Many plant developmental processes, including bud dormancy, are controlled by this protein.
3. Carotenoids are the source of abscisic acid.

Explanation of incorrect option:

Option A:

1. Indole butyric acid (IBA) is a naturally occuring auxin.
2. It is found in active cell division areas such as apical meristems, cambium, developing fruit, embryos, and endosperm.

Option C:

1. Plant growth regulators (PGRs) are derived from gibberellic acid (GA3) and commercially available synthetic plant growth regulators (PGRs) .
2. Gibberellins (GAs) are a wide family of natural chemicals that govern a variety of plant developmental processes, including seed germination, stem elongation, and flowering induction.

Option D:

1. IAA is an indole derivative with a carboxymethyl substituent.
2. IAA or indole-3-acetic acid is a naturally occurring plant hormone. It imparts various physiological effects and regulates plant growth and development.

Final answer: Abscisic acid is a derivative of carotenoids