2
Question
Yeast are economically important because they
Yeast are economically important because they
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Solution
The correct option is D Are used in wine and baking industry
The yeasts have a lot of economic value to the mankind. They have certain beneficial as well as harmful activities.
Beneficial uses-
1. Bread making: For the manufacture of bread, yeast is mixed with white flour. Blocks of treated flour are kept at suitable temperature. The process of fermentation starts. Ethyl alcohol and carbon dioxide are formed. The bread swells up and becomes spongy due to the pressure exerted by accumulated carbon dioxide. Flavour and quality of bread is attained by selecting different strains of yeast.
2. Production of alcohol: Ethyl alcohol is manufactured by the fermentation of potatoes, cereals, molasses etc.
C6H12O6 + Yeast zymase --> 2C2H5OH + 2CO2
The breakdown of carbohydrates (starch and sugar) by yeast into carbon dioxide and ethyl alcohol in the absence of oxygen is called as alcoholic fermentation. The alcohol is the major ingredient in brewing industry.
3. Yeast as a source of food: Yeast contains nutritive substances and proteins in sufficient quantities. Dried yeast cells contain 40 - 50% of protein. Some strains of yeast have considerable amount of fat.
4. Yeast as a source of vitamins and enzymes: Yeast is used in the preparation of Vitamin B complex tablets. When yeast cells are irradiated with ultra-violet rays, Vitamin D is produced. They are also utilized in medicine as a source of enzymes.
The yeasts have a lot of economic value to the mankind. They have certain beneficial as well as harmful activities.
Beneficial uses-
1. Bread making: For the manufacture of bread, yeast is mixed with white flour. Blocks of treated flour are kept at suitable temperature. The process of fermentation starts. Ethyl alcohol and carbon dioxide are formed. The bread swells up and becomes spongy due to the pressure exerted by accumulated carbon dioxide. Flavour and quality of bread is attained by selecting different strains of yeast.
2. Production of alcohol: Ethyl alcohol is manufactured by the fermentation of potatoes, cereals, molasses etc.
C6H12O6 + Yeast zymase --> 2C2H5OH + 2CO2
The breakdown of carbohydrates (starch and sugar) by yeast into carbon dioxide and ethyl alcohol in the absence of oxygen is called as alcoholic fermentation. The alcohol is the major ingredient in brewing industry.
3. Yeast as a source of food: Yeast contains nutritive substances and proteins in sufficient quantities. Dried yeast cells contain 40 - 50% of protein. Some strains of yeast have considerable amount of fat.
4. Yeast as a source of vitamins and enzymes: Yeast is used in the preparation of Vitamin B complex tablets. When yeast cells are irradiated with ultra-violet rays, Vitamin D is produced. They are also utilized in medicine as a source of enzymes.
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