Question

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

Options

• Ethylene

• Abscisic acid

• Gibberellin

• Cytokinin

Answer 1

Cytokinin

Explanation:

Plant hormones called cytokinins encourage nutrient mobilisation and maintain chlorophyll levels, delaying leaf senescence (ageing). This prolongs the leaf’s green colour and photosynthetic activity. Gibberellins are more closely linked to growth processes like stem elongation, whereas other hormones like ethylene and abscisic acid encourage senescence.