KCET · BIOLOGY · STD 12 - 8. Microbes in Human Welfare

Match the following bacteria of Column I with their commercial products of Column II.
Column I Column II
(A) Lactobacillus (p) Butyric acid
(B) Aspergillus niger (q) Acetic acid
(C) Asetobacter aceti (r) Lactic acid
(D) Clostridium butylicum (s) Citric acid
Select the code for the correct answer from the options given below.

A A - r, B - q, C - s, D - p
B A - p, B - s, C - r, D - q
C A - r, B - s, C - q, D - p
D A - r, B - s, C - p, D - q

Verified Solution

Answer & Solution

Correct Answer

(C) A - r, B - s, C - q, D - p

Step-by-step Solution

Detailed explanation

(C) A - r, B - s, C - q, D - p,
The correct mathing is: Production of lacic acid (2-3%) by the Lactobacillus facilities coagulation of milk protein into curd.
The mould Aspergillus niger makes citric acid when molasses is used as the fermentation substrate.
Acetic acid (vinegar) is made from ethyl alcohol by Acetobacter aceti. It oxidises the alcohol to acetic acid. Butyrate is produced as an end-product of a fermentation process solely generated by Clostridium butylicum and is used in the preparation of various butyrate esters.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Column I	Column II
(A) Lactobacillus	(p) Butyric acid
(B) Aspergillus niger	(q) Acetic acid
(C) Asetobacter aceti	(r) Lactic acid
(D) Clostridium butylicum	(s) Citric acid