Question: 126. Identify the part of a bio-reactor which is used as a foam braker from the given figure.
(1) A
(2) B
(3) D
(4) C
Answer: Option (4)
Explanation:
In a stirred-tank bioreactor, excessive foam may be produced due to vigorous aeration and microbial activity.
The foam breaker is a mechanical device fitted near the top of the bioreactor to break the foam and prevent its accumulation.
This helps in maintaining proper aeration, prevents loss of culture medium, and avoids contamination.
In the given figure, the part labeled C represents the foam breaker mechanism.
Other parts such as impellers, inlet or outlet pipes, and sampling ports do not perform foam-breaking functions.
Therefore, the correct answer is option (4).