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JKCET Microbes in Human Welfare — practice questions

Explore 5 free Microbes in Human Welfare questions in JKCET Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Microbes in Human Welfare questions and exercises with answers

Showing questions 1–5 of 5.

The 'large holes' in Swiss cheese are produced by:Read the answer and worked solution →'Toddy' — a traditional fermented drink of southern India — is made from:Read the answer and worked solution →Among the following beverages, which is produced WITHOUT distillation?Read the answer and worked solution →Citric acid is produced industrially by:Read the answer and worked solution →Production of acetic acid (vinegar) industrially uses:Read the answer and worked solution →

Worked practice questions

The 'large holes' in Swiss cheese are produced by:

  1. Air injected during manufacture
  2. CO₂ released during fermentation by Propionibacterium sharmanii
  3. Lactic acid bubbles
  4. Penicillium roqueforti
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Correct answer: B. CO₂ released during fermentation by Propionibacterium sharmanii

**Swiss cheese holes** = CO₂ produced by **Propionibacterium sharmanii** during fermentation. **Roquefort cheese** is distinct — ripened by the fungus *Penicillium roqueforti* growing on it (gives the blue veins + flavour).

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'Toddy' — a traditional fermented drink of southern India — is made from:

  1. Soybean curd
  2. Fermented milk
  3. Distilled rice wine
  4. Sap of palms — fermented by yeast
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Correct answer: D. Sap of palms — fermented by yeast

**Toddy** = traditional fermented drink in south India, made by **fermenting the sap of palms**. Your syllabus explicitly mentions toddy as a household-scale fermented beverage.

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Among the following beverages, which is produced WITHOUT distillation?

  1. Wine and beer (only fermentation; no distillation)
  2. Rum
  3. All require distillation
  4. Whisky and brandy
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Correct answer: A. Wine and beer (only fermentation; no distillation)

**Wine and beer** = produced by fermentation **without distillation**. **Whisky, brandy, and rum** = produced by **distillation** of the fermented broth (higher alcohol content).

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