Question

Given above is a graph showing growth versus time. $A$, $B$ and $C$ represent

• A. Exponential phase, lag phase and steady state phase
• B. Steady state phase, lag phase and log phase
• C. Slow growing phase, lag phase, steady state phase
• D. Log phase, lag phase and steady state phase

Answer 1

The correct option is B Steady state phase, lag phase and log phase

Growth is divided into four phases, namely lag phase, exponential phase, stead state phase and death phase. In lag phase, there is very little or no bacterial growth. In this phase, bacteria are adjusting to environment and synthesizing biochemicals and nutrients. In exponential phase, the number of bacterial cells doubles at an exponential rate. The maximum growth phase is log phase. In stead state phase, the rate of cell death is equal to the rate of cell division. In death phase, there is decrease in the bacterial population due to lack of nutrients and high toxin concentration.

Thus, the correct answer is option B.