Name the enzymes responsible for the following actions:
(i) Removing oily stains from the laundry
(ii) Clarifying bottled fruit juices
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (i) Lipases, (ii) Pectinases and proteases
Microbes are used to produce several enzymes for industry and medicine. Each enzyme has its own use, so both parts of the question must be known.
Option (1) (i) Pectinases and proteases, (ii) Lipases — Incorrect. The two enzymes are swapped. Pectinases and proteases are used to clarify fruit juices, while lipases remove oily stains.
Option (2) (i) Lipases, (ii) Pectinases and proteases — Correct. Lipases are added to detergent formulations because they help remove oily stains from laundry. Bottled fruit juices are clearer than home-made ones because they are clarified with pectinases and proteases.
Option (3) (i) Lipases, (ii) Streptokinase — Incorrect. Lipases for oily stains is right, but streptokinase is not used for juices. Streptokinase, made by Streptococcus, is a ‘clot buster’ used to remove clots from blood vessels of heart patients.
Option (4) (i) Streptokinase, (ii) Pectinases and proteases — Incorrect. Pectinases and proteases for juices is right, but streptokinase has no role in laundry. It is used to dissolve blood clots.
NCERT Extract:
Chemicals, Enzymes and other Bioactive Molecules – “… Microbes are also used for production of enzymes. Lipases are used in detergent formulations and are helpful in removing oily stains from the laundry. You must have noticed that bottled fruit juices bought from the market are clearer as compared to those made at home. This is because the bottled juices are clarified by the use of pectinases and proteases. Streptokinase produced by the bacterium Streptococcus and modified by genetic engineering is used as a ‘clot buster’ for removing clots from the blood vessels of patients who have undergone myocardial infarction leading to heart attack.”