Assertion [A]: Initial phase of geometric growth is lag phase
Reason [R]: In lag phase the number new cells formed from existing cells is equal to the number cells degenerated by programmed cell death.

In geometrical growth. In most systems, the initial growth is slow (lag phase), and it increases rapidly thereafter – at an exponential rate (log or exponential phase). Here,
both the progeny cells following mitotic cell division retain the ability to divide .