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Question

The puffed-up appearance of dough is due to fermentation by yeast. Identify the gas liberated during the process


A
Methane
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B
Carbon dioxide
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C
Hydrogen sulphide
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D
Ammonia
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Solution

The correct option is B Carbon dioxide
Yeast respire anaerobically i.e., through fermentation and convert the carbohydrate in the dough to alcohol and releases carbon dioxide as a by-product. Due to the release of carbon dioxide dough becomes puffy.

Biology

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