Observe the figures I and II and answer the following questions.

Identify the statements which are correct with respect to the above figures I and II

A. I represent increased surface area for oxygen transfer

B. Fig II is of simple stirred-tank bioreactor

C. A stirred-tank reactor is usually cylindrical with a curved base

D. The base of the tank is curved to facilitate mixing of the reactor contents

Choose the correct answer from the options given below:

C and D only

The correct answer is Option (3) - C and D only

A stirred-tank reactor is usually cylindrical or with a curved base to facilitate the mixing of the reactor contents.

The stirrer facilitates even mixing and oxygen availability throughout the bioreactor. Alternatively air can be bubbled through the reactor. Bioreactor has an agitator system, an oxygen delivery system and a foam control system, a temperature control system, pH control system and sampling ports so that small volumes of the culture can be withdrawn periodically.