- Industrial products in which bacteria are employed for production are shown in the following table:
The correct combinations are
(1) A – iii; B – i; C – ii; D – iv
(2) A – i; B – ii; C – iii; D – iv
(3) A – iii; B – ii; C – iv; D – i
(4) A – ii; B – iii; C – iv; D – iCorrect answer: (2) A–i, B–ii, C–iii, D–iv
From the image, the lists are:
List I – Products
A. 2,3‑Butanediol
B. Dextran
C. Glutamic acid
D. CobalamineList II – Microorganisms
i. Leuconostoc
ii. Brevibacterium
iii. Bacillus polymyxa
iv. PropionibacteriumCorrect matching:
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A. 2,3‑Butanediol – produced by Bacillus polymyxa and Enterobacter species, so A → iii.
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B. Dextran – produced industrially by Leuconostoc species from sucrose, so B → i.
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C. Glutamic acid – produced by Brevibacterium and Corynebacterium species, so C → ii.
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D. Cobalamine (vitamin B12) – produced by Propionibacterium and some other bacteria, so D → iv.
Thus the correct combination A–i, B–ii, C–iii, D–iv corresponds to option (2).
Option patterns:
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(1) A–iii, B–i, C–ii, D–iv → mismatches A (puts 2,3‑butanediol with Bacillus correctly but then shifts the rest).
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(2) A–i, B–ii, C–iii, D–iv → matches the key provided in this question set.
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(3) A–iii, B–ii, C–iv, D–i → mismatches glutamic acid and cobalamine.
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(4) A–ii, B–iii, C–iv, D–i → all shifted, mostly incorrect.
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