IMMUNOLOGY

Detailed explanation-1: -Cytokinin is a plant hormone which prevents the degeneration of chlorophyll and protein and thus causes the delay in ageing of the plant. It thus helps in reducing the leaf fall. This is called as ‘Richmond Lang effect’ by cytokinin.

Detailed explanation-2: -Whereas senescence is accompanied by a decline in leaf cytokinin content, supplemental cytokinin delays senescence.

Detailed explanation-3: -Cytokinins are a group of plant growth regulators which are primarily involved in performing cell division in plant roots, shoot system. This hormone helps in promoting the cell’s growth, development, differentiation, affecting apical dominance and delay in leaf senescence.