alleryThe organism Aspergillus niger is used to produce which industrial product?
ACitric acid
BButyric acid
CEthanol
DStreptokinase
Answer & Solution
Correct answer: A. Citric acid
1. Your syllabus lists organic-acid producers for industrial fermentation.
2. Aspergillus niger, a fungus, is the source of citric acid.
3. Acetobacter aceti produces acetic acid; Clostridium butylicum produces butyric acid.
4. Lactobacillus produces lactic acid; Saccharomyces produces ethanol.
_Source: syllabus Biology, Ch 8 "Microbes in Human Welfare", §8.2.3_
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