Vinegar and Citric Acid – Section 1

6. What is the pH of the medium when sucrose is used as a substrate for the production of citric acid?

A. 3
B. 4
C. 5
D. 6

Correct Answer: A. 3

7. In the liquid surface culture process for the fermentation to produce citric acid,

A. A. niger is used with the solid substrate as sweet potato
B. A. niger floats on the surface of the solution
C. Fungal mycelium grows throughout the solution in a deep tank
D. both (a) and (b)

Correct Answer: B. A. niger floats on the surface of the solution

8. In the koji process for the fermentation to produce citric acid,

A. A. niger is used with the solid substrate as sweet potato
B. A. niger floats on the surface of the solution
C. Fungal mycelium grows throughout the solution in a deep tank
D. both (a) and (b)

Correct Answer: A. A. niger is used with the solid substrate as sweet potato

9. What is the pH of the medium when molasses is used as a substrate for the production of citric acid?

A. 3
B. 4
C. 5
D. 6

Correct Answer: C. 5

10. Which of the following nitrogen sources is added in the fermentation medium of citric acid production?

A. Ammonium salt
B. Urea
C. Both (a) and (b)
D. Peptone

Correct Answer: C. Both (a) and (b)

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