2025 Plant Growth and DevelopmentPlant Growth Regulators - Cytokinins Easy Question 1 of 4 in Plant Growth Regulators - Cytokinins

Which of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?

A Ethylene
B Abscisic acid
C Gibberellin
D Cytokinin

The answer is D.

Solution

Cytokinins delay senescence via nutrient mobilization (Richmond-Lang effect).

Cytokinins promote cell division and direct mobilization of nutrients towards developing and mature tissues, helping to delay senescence (Richmond-Lang effect).

Concept Phytohormone Functions

Plant Growth Regulators - Cytokinins in past papers

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