Question

Which one of the following pairs is not correctly matched?

• A. Adenine derivative - Kinetin
• B. Carotenoid derivative - $ABA$
• C. Terpenes - $IAA$
• D. Indole compounds - $IBA$
• E. Gas - Ethylene

Answer 1

Answer: (C)

The plant growth regulators (PGRs) are small, simple molecules of diverse chemical composition. They could be indole compounds (indole-3-acetic acid, IAA, IBA); adenine derivatives (N-6-furfurylamino purine, kinetin), derivatives of carotenoids (abscisic acid, ABA); terpenes (gibberellic acid, $G{A}_3$) or gases (ethylene, $C_2{H}_4$). Plant growth regulators are variously described as plant growth substances, plant hormones or phytohormones in literature.