Q72. Some dividing cells exit the cell cycle and enter the vegetative inactive stage. This is called quiescent stage (G0). This process occurs at the end of
1. M phase
Some cells in the adult animals do not appear to exhibit division (e.g., heart cells) and many other cells divide only occasionally, as needed to replace cells that have been lost because of injury or cell death. These cells that do not divide further exit G1 phase to enter an inactive stage called the quiescent stage (G0) of the cell cycle.