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Q112 (CDS-I/2014) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Microbiology and immunity Answer Verified

What causes dough (a mixture of flour, water, etc.) to rise when yeast is added to it?

Result
Your answer: —  Â·  Correct: D
Explanation

Dough rises primarily due to the release of carbon dioxide gas during the process of fermentation. Yeast, a fungal microorganism, respires by breaking down sugars present in the flour [1]. In the absence of oxygen, yeast undergoes anaerobic respiration, converting glucose into ethanol and carbon dioxide. This carbon dioxide gas forms tiny bubbles or air pockets within the dough [1]. These bubbles are trapped by the gluten network created during kneading, causing the dough to expand and become soft and fluffy [2]. While temperature affects the rate of yeast activity and fermentation, it is the physical accumulation and expansion of the carbon dioxide gas itself that causes the dough to rise [1]. During baking, this gas expands further due to heat, contributing to the final leavened structure of the bread.

Sources

  1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 2: The Invisible Living World: Beyond Our Naked Eye > Activity 2.8: Let us perform > p. 21
  2. [2] Science , class X (NCERT 2025 ed.) > Chapter 5: Life Processes > Activity 5.5 > p. 87
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