GATE 2021 BT – Question 37

Plant, Animal and Microbial Biotechnology · Microbes: Production of biomass and metabolites, biofuels, bioplastics, enzymes, antibiotics, recombinant proteins, clinical, food and industrial microbiology · 2 marks · Multiple choice

Match P amylase, Q invertase, R pectinase and S xylanase to: 1 laundry detergent, 2 fruit-juice clarification, 3 liquefaction of sucrose, 4 pulp and paper processing.

P-2,Q-3,R-4,S-1
P-1,Q-3,R-2,S-4
P-1,Q-2,R-3,S-4
P-1,Q-4,R-2,S-3

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Correct answer: (B) P-1,Q-3,R-2,S-4

Explanation

Match each enzyme with its industrial use.

**P. Amylase:** breaks down starch stains, so it is added to **laundry detergents**. P-1.
**Q. Invertase:** hydrolyses sucrose to glucose and fructose (invert sugar). Item 3 in the list ("liquefaction of sucrose") describes this. Q-3.
**R. Pectinase:** degrades pectin, so it **clarifies fruit juice**. R-2.
**S. Xylanase:** breaks down xylan in plant cell walls and is used in **pulp and paper** processing (bleaching). S-4.

Match: **P-1, Q-3, R-2, S-4** (option B).