Question

Identify A,B, and C in the given graph

• A. A - log phase, B - lag phase , C -Stationary phase
• B. A - lag phase, B - log phase, C -Stationary phase
• C. A-log phase, B - exponential phase, C-lag phase
• D. A - slow phase, B - sigmoid phase, C- stationary phase

Answer 1

The correct option is B

A - lag phase, B - log phase, C -Stationary phase

The graph shown is a S-shaped graph of the geometric growth, a characteristic of living organisms in the natural environment and is called the Sigmoid curve. In natural environments, in most systems growth is slow initially because there are few cells in the beginning. This represents lag phase. Growth increases rapidly at an exponential rate once the number of cells reach a considerable amount, representing log phase. However, with time depletion of nutrients occurs and with limited nutrient supply the growth slows down, leading to stationary phase.