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Match the following organisms with the products they produce: (a) Lactobacillus, (b) Saccharomyces cerevisiae, (c) Aspergillus niger, (d) Acetobacter aceti; Products: (i) Cheese, (ii) Curd, (iii) Citric acid, (iv) Bread, (v) Acetic acid. Select the correct option.

1. (a) (ii) (v) (iii) (i)
2. (b) (ii) (iv) (iii) (v)
3. (c) (iii) (iv) (v) (i)
4. (d) (ii) (i) (iii) (v)

Correct answer: (b) (ii) (iv) (iii) (v)

Solution

Lactobacillus converts milk into curd, Saccharomyces cerevisiae is baker’s yeast used in bread making, Aspergillus niger is used to produce citric acid, and Acetobacter aceti produces acetic acid (vinegar). These pairings give (b) → (ii), (iv), (iii), (v).

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