NEET 1998 · Class 12

Microbes in Human Welfare

Which of the following microorganisms is used for production of citric acid in industries?

  1. (A)Aspergillus niger
  2. (B)Rhizopus nigricans
  3. (C)Lactobacillus bulgaris
  4. (D)Penicillium citrinum

The NCERT line that answers it

Verbatim line

Examples of acid producers are *Aspergillus niger* (a fungus) of citric acid, *Acetobacter aceti* (a bacterium) of acetic acid; *Clostridium butylicum* (a bacterium) of butyric acid and *Lactobacillus* (a bacterium) of lactic acid.

Chapter
Microbes in Human Welfare
Section
8.2.3 Chemicals, Enzymes and other Bioactive Molecules
Page
4
Words matched
33 of 33

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'Aspergillus niger (a fungus) of citric acid', which directly matches the question about microorganisms used for citric acid production and identifies Aspergillus niger as the correct answer.

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Question text is reproduced from the published NEET 1998 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.