Question
Describe the fermentation process using yeast and explain its importance in daily life, including experimental evidence.
✓
Answer
Fermentation is a metabolic process carried out by yeast, where it breaks down sugars into alcohol and carbon dioxide in the absence of oxygen (anaerobic conditions). In food science, yeast is commonly used in baking and brewing. When added to flour dough, yeast consumes the sugars and produces carbon dioxide gas, which forms bubbles and causes the dough to rise, making it soft and spongy. This process is also essential in making alcoholic beverages like beer and wine.
Experimentally, fermentation can be demonstrated by mixing sugar, yeast, and warm water in a flask, sealing the opening with a balloon. After some time, the balloon inflates, indicating the production of carbon dioxide. If the released gas is passed through lime water, it turns milky, confirming the presence of CO2. This experiment proves that yeast performs anaerobic respiration during fermentation. The process is temperature-sensitive and works best in warm, moist conditions. Fermentation not only improves the texture and taste of food but also preserves it and adds nutritional value.
Experimentally, fermentation can be demonstrated by mixing sugar, yeast, and warm water in a flask, sealing the opening with a balloon. After some time, the balloon inflates, indicating the production of carbon dioxide. If the released gas is passed through lime water, it turns milky, confirming the presence of CO2. This experiment proves that yeast performs anaerobic respiration during fermentation. The process is temperature-sensitive and works best in warm, moist conditions. Fermentation not only improves the texture and taste of food but also preserves it and adds nutritional value.
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