biology : class12 Yeast in Alcohol Production : Food Processing, Industrial Production, Sewage Treatment, Energy Production : Microbes in Human Welfare MCQ Questions and Answers
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Yeast in Alcohol Production
MCQ questions and answers.
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MCQ Questions
1. Which microorganism is commonly used for the production of alcohol by fermentation?
A.
Saccharomyces cerevisiae
B.
Lactobacillus
C.
Penicillium notatum
D.
Rhizobium
Correct Answer:
Saccharomyces cerevisiae
Explanation:
Saccharomyces cerevisiae, commonly called baker's yeast, carries out alcoholic fermentation and produces ethanol.
2. What is the main alcohol produced when yeast ferments sugars?
A.
Methanol
B.
Ethanol
C.
Propanol
D.
Butanol
Correct Answer:
Ethanol
Explanation:
Yeast converts sugars into ethanol, the alcohol present in beverages such as beer and wine.
3. Which gas is released along with ethanol during alcoholic fermentation by yeast?
A.
Oxygen
B.
Nitrogen
C.
Carbon dioxide
D.
Hydrogen
Correct Answer:
Carbon dioxide
Explanation:
During alcoholic fermentation, yeast converts sugars into ethanol and carbon dioxide.
4. Alcoholic fermentation by yeast generally takes place under which condition?
A.
Anaerobic condition
B.
Highly oxygenated condition
C.
Complete absence of sugar
D.
Continuous exposure to sunlight
Correct Answer:
Anaerobic condition
Explanation:
Yeast produces ethanol mainly when oxygen is limited, using anaerobic fermentation of sugars.
5. Which beverage is commonly produced by the fermentation of malted cereals using yeast?
A.
Beer
B.
Curd
C.
Vinegar
D.
Lemonade
Correct Answer:
Beer
Explanation:
Beer is produced by fermenting sugars obtained from malted cereals with yeast.
6. Which beverage is produced by the fermentation of fruit juices using yeast?
A.
Wine
B.
Butter
C.
Cheese
D.
Pickle
Correct Answer:
Wine
Explanation:
Yeast ferments the sugars present in fruit juices, especially grape juice, to produce wine.
7. What is the primary food substance used by yeast during alcohol production?
A.
Sugars
B.
Mineral salts
C.
Proteins only
D.
Cellulose fibres only
Correct Answer:
Sugars
Explanation:
Yeast breaks down fermentable sugars to obtain energy and produces ethanol and carbon dioxide.
8. Which process is directly responsible for the formation of ethanol by yeast?
A.
Alcoholic fermentation
B.
Photosynthesis
C.
Nitrification
D.
Transpiration
Correct Answer:
Alcoholic fermentation
Explanation:
Alcoholic fermentation is the metabolic process in which yeast converts sugars into ethanol and carbon dioxide.
9. Which group of beverages is commonly prepared using yeast fermentation followed, in some cases, by distillation?
A.
Whisky, rum and brandy
B.
Milk, curd and butter
C.
Tea, coffee and cocoa
D.
Juice, syrup and jam
Correct Answer:
Whisky, rum and brandy
Explanation:
Yeast first ferments sugars or starch-derived sugars, and beverages such as whisky, rum and brandy may then be obtained through distillation.
10. What is the role of yeast in alcohol production?
A.
It converts sugars into ethanol
B.
It converts ethanol into oxygen
C.
It removes all water from the beverage
D.
It converts proteins directly into starch
Correct Answer:
It converts sugars into ethanol
Explanation:
Yeast performs alcoholic fermentation, changing fermentable sugars into ethanol and releasing carbon dioxide.
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