The bread or idli dough rises because of
(i) heat (ii) grinding (iii) growth of yeast cells (iv) kneading
NCERT Class VIII
Science - Main Course Book
Chapter 2. Microorganisms: Friend and Foe
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(iii)growth of yeasts is the answer.......
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The bread or idli dough rises because of the 'growth of yeast cells'.
Option (iii)
Explanation:
- 'Yeast is a 'fundamental component' for making bread and other savory baked goods. Yeast is added to warm water, where yeast reproduces and builds a colony.
- They use the 'sugars present' in the bread and secretes a liquid along with carbon dioxide as well as ethyl alcohol. The gas and alcohol help in rising the bread. The bread becomes 'very soft and fluffy' as a result.
- When the bread is baked, the alcohol evaporates off and the resultant bread tastes fine.
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