NEET 2021 · Class 12

Microbes in Human Welfare

Match List-I with List-II List-I | List-II (a) Aspergillus niger | (i) Acetic Acid (b) Acetobacter aceti | (ii) Lactic Acid (c) Clostridium butylicum | (iii) Citric Acid (d) Lactobacillus | (iv) Butyric Acid Choose the correct answer from the options given below.

  1. (A)(a)-(iii) (b)-(i) (c)-(iv) (d)-(ii)
  2. (B)(a)-(i) (b)-(ii) (c)-(iii) (d)-(iv)
  3. (C)(a)-(ii) (b)-(iii) (c)-(i) (d)-(iv)
  4. (D)(a)-(iv) (b)-(ii) (c)-(i) (d)-(iii)

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 lists each microorganism with its specific acid product, directly matching all four pairs in option A: Aspergillus niger-citric acid, Acetobacter aceti-acetic acid, Clostridium butylicum-butyric acid, and Lactobacillus-lactic acid.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

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Question text is reproduced from the published NEET 2021 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.