A fermentation process using Aspergillus niger produces citric acid. The yield drops significantly when the pH rises above 6.0. Which conclusion is correct?

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Science · Industrial Microbiology

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Correct answer

Citric acid production by Aspergillus niger is optimal under acidic conditions.

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Answer 1

Aspergillus niger cannot grow at all at a pH level below 6.0.

Answer 2

Citric acid production strictly requires a neutral or basic pH.

Answer 3

The yield of citric acid is entirely independent of pH variations.

Answer 4

Citric acid production by Aspergillus niger is optimal under acidic conditions.

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