Match List-I to List-II
| List-I | List-II |
|---|---|
| Producer | Acid |
| (A) Clostridium butylicum | (I) Lactic acid |
| (B) Aspergillus niger | (II) Butyric acid |
| (C) Acetobacter aceti | (III) Citric acid |
| (D) Lactobacillus | (IV) Acetic acid |
Choose the correct options
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A) - (II), (B) - (III), (C) - (IV), (D) - (I)
(A) Clostridium butylicum — this matches (II) Butyric acid. This bacterium ferments sugars to butyric acid.
(B) Aspergillus niger — this matches (III) Citric acid. Aspergillus is a fungus, and it is the commercial source of citric acid.
(C) Acetobacter aceti — this matches (IV) Acetic acid. This bacterium oxidises alcohol to acetic acid, the acid of vinegar.
(D) Lactobacillus — this matches (I) Lactic acid. These are the lactic acid bacteria (LAB). They turn milk into curd by making lactic acid.
Note: A similar question was also asked in CUET (UG) 2026 on 26-05-2026 (Slot 1), on 24-05-2026 (Slot 2) and on 19-05-2026 (Slot 2), in CUET (UG) 2024 on 19-07-2024 (Slot 1), and in CUET (UG) 2023 on 15-06-2023 (Slot 1), on 11-06-2023 (Slot 3), on 30-05-2023 (Slot 1) and on 28-05-2023 (Slot 1).
NCERT Extract:
Chemicals, Enzymes and other Bioactive Molecules – “Microbes are also used for commercial and industrial production of certain chemicals like organic acids, alcohols and enzymes. 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.”