Solution

Cytokinins (e.g. kinetin) are adenine derivatives. Auxin (IAA) is derived from the amino acid tryptophan, abscisic acid is a carotenoid (violaxanthin) derivative, and ethylene is a gaseous hormone derived from methionine.

Concept Plant growth regulators - cytokinins

Plant Growth Regulators - Cytokinins in past papers

4 questions from this chapter have appeared across 4 exam years.