Which or the following statements is incorrect?
Answer: (B) Bio-reactors are used to produce small scale bacterial cultures.. Answer: (B) Bio-reactors are used to produce small scale bacterial cultures.
- A.Most commonly used bio-reactors are of stirring type.
- B.Bio-reactors are used to produce small scale bacterial cultures.✓
- C.Bio-reactors have an agitator system, an oxygen delivery system and foam control system.
- D.A bio-reactor provides optimal growth conditions for achieving the desired product.
Correct Answer
(B) Bio-reactors are used to produce small scale bacterial cultures.
Solution & Explanation
Answer: (B) Bio-reactors are used to produce small scale bacterial cultures. Solution: This statement is incorrect — bioreactors are developed precisely for LARGE-scale processing (100-1000 litres of culture), because small-volume cultures cannot yield appreciable quantities of product. The other statements are correct: the most commonly used bioreactors are of the stirring type, they have agitator/oxygen-delivery/foam-control systems, and they provide optimal growth conditions for the desired product. NCERT Reference: Ch 9, p.174, line(s) 16-18 — "Small volume cultures cannot yield appreciable quantities of products. To produce in large quantities, the development of bioreactors, where large volumes (100-1000 litres) of culture can be processed, was required."