Solution: The logistic population growth curve is most commonly observed in yeast cells produced in laboratory circumstances, and it contains five phases:
- The lag phase – the population of yeast cells is small at first because resources in the habitat are restricted. Exponential phase – in this stage, the population of the yeast cell suddenly rises as a result of rapid growth leading to exponential population growth due to the availability of enough food resources, consistent favorable environmental conditions without any interspecific competition. This results in the curve rising upwards steeply.
- Positive acceleration phase — cell growth is restricted at the start of this phase. The yeast cell adjusts to its new surroundings and multiplies.
- Negative acceleration phase – as a result of greater competition between yeast cells for shelter and food, environmental resistance increases, and population growth rate decreases.
- Stationary phase – In this phase, the population is stable. In a population, the number of cells created equals the number of cells that die out. Furthermore, the species’ population is said to have reached its habitat’s carrying capacity. The Verhulst-Pearl logistic curve is another name for an S-shaped growth curve.