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Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants?
Solution:
Cytokinins are a class of plant hormones that play a crucial role in delaying senescence (aging) in plants, particularly in leaves. They achieve this by promoting the mobilization of nutrients (like amino acids and minerals) into the leaves, thus maintaining their metabolic activity and greenness. This effect is often referred to as the Richmond-Lang effect. In contrast, Ethylene and Abscisic acid are known to promote senescence and abscission (shedding) of leaves and fruits. Gibberellins primarily promote stem elongation, seed germination, and flowering.