Question: 169. Which of the following statements is incorrect?
(1) A bio-reactor provides optimal growth conditions for achieving the desired product.
(2) Most commonly used bio-reactors are of stirring type.
(3) Bio-reactors are used to produce small scale bacterial cultures.
(4) Bio- reactors have an agitator system, an oxygen delivery system and foam control system.
Answer: Option (3)
Explanation:
A bioreactor is a large vessel designed to provide controlled and optimal conditions such as temperature, pH, nutrients, oxygen supply, and agitation for the large-scale growth of microorganisms or cells.
Statement (1) is correct because bioreactors are specifically designed to maintain optimal growth conditions for maximum yield of the desired product.
Statement (2) is correct as stirred-tank bioreactors are the most commonly used type due to efficient mixing and oxygen distribution.
Statement (4) is correct because bioreactors are equipped with essential components such as an agitator system for mixing, an oxygen delivery system for aerobic respiration, and a foam control system.
Statement (3) is incorrect because bioreactors are used for large-scale production of microbial cultures and industrial products, not for small-scale bacterial cultures,
which are usually grown in flasks or test tubes.