Question

Exponential growth in a given population of a microorganism is limited by

• A. Competition for food
• B. Accumulation of waste matter
• C. Both of (A) and (B)
• D. None of the above

Answer 1

The correct option is C Both of (A) and (B)

The exponential phase is characterised by the vigorous growth of the bacteria where it is in the constant state of division. They undergo the DNA replication and synthesis of new proteins which increases their metabolic rate.

As the bacterial population continues to grow, all the nutrients in the growth medium are used up by the microorganism for their multiplication. This results in the accumulation of waste materials, toxic metabolites and inhibitory compounds such as antibiotics in the medium. The reproduction rate will slow down, the cells undergoing division is equal to the number of cell death, and finally, bacteria stops its division completely. Thus, the correct answer is option C.