Which phase of a population growth curve is characterized by a slowing of population growth as the carrying capacity is being reached?

Lag Phase

Explanation:

In logistic growth, lag phase is characterized by a slowing population growth because at that moment the cells are metabolically active and are only increasing in cell size.

Let consider a bacterial growth during it lag phase. In the lag phase, bacteria adapt themselves to growth conditions, that period of time, they are still maturing and are yet to divide.

As such, the phase of a population growth curve is characterized by a slowing of population growth as the carrying capacity is being reached is known as Lag Phase.