Importance of senescence :
(a) It maintains efficiency since the older, exhausted and inefficient parts are replaced by new, younger plants.
(b) Shoot senescence is a mechanism to help the plants perennate during unfavourable periods.
(c) The cellular breakdown results in release of many nutrients during senescence.
(d) Litter of fallen leaves and twigs is an important
source of humus and mineral replenishment for the soil.