Match List-I with List-II:
| List-I (Microbe) | List-II (Commercial product) |
| A. Aspergillus niger | I. Statins |
| B. Acetobacter aceti | II. Butyric acid |
| C. Clostridium butylicum | III. Citric acid |
| D. Monascus purpureus | IV. Acetic acid |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A-III, B-IV, C-II, D-I
Microbes are used for the commercial production of organic acids and other bioactive molecules. Each microbe in List-I is matched with the product it is used to make.
(A) Aspergillus niger — this matches (III) Citric acid. Aspergillus niger is a fungus used to produce citric acid.
(B) Acetobacter aceti — this matches (IV) Acetic acid. This bacterium is the producer of acetic acid.
(C) Clostridium butylicum — this matches (II) Butyric acid. This bacterium is the producer of butyric acid.
(D) Monascus purpureus — this matches (I) Statins. Statins from this yeast are blood-cholesterol lowering agents; they competitively inhibit the enzyme for cholesterol synthesis.
So the matching is A-III, B-IV, C-II, D-I.
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. … Statins produced by the yeast Monascus purpureus have been commercialised as blood-cholesterol lowering agents.”