Match Column I with Column II:
| Column I | Column II |
| A. Aspergillus niger | i. Lactic acid |
| B. Acetobacter aceti | ii. Butyric acid |
| C. Clostridium butylicum | iii. Acetic acid |
| D. Lactobacillus | iv. Citric acid |
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) - A-iv, B-iii, C-ii, D-i
| Column I | Column II |
| A. Aspergillus niger | iv. Citric acid |
| B. Acetobacter aceti | iii. Acetic acid |
| C. Clostridium butylicum | ii. Butyric acid |
| D. Lactobacillus | i. Lactic acid |
Microbes are 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. Yeast (Saccharomyces cerevisiae) is used for commercial production of ethanol. Microbes are also used for production of enzymes. Lipases are used in detergent formulations and are helpful in removing oily stains from the laundry.