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Question
In koji process for the fermentation to produce citric acid,
Options:
A .  A. niger is used with solid substrate as sweet potato
B .  A. niger floats on the surface of solution
C .  Fungal mycelium grows through out the solution in a deep tank
D .  both (a) and (b)
Answer: Option A
Answer: (a).A. niger is used with solid substrate as sweet potato

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