Multiple choice

Directions: Read the following information and answer the given question.

Ria asked her mother to prepare idlis for her. She saw her mother adding 3-4 globules of yeast to the idli paste which she has prepared. She observed that the dough of the idli rose after some time. She had also read in a text book that yeasts are used in the brewing industry in the manufacture of alcohol.

How does such a small amount of yeast added helps in production of idli?

  1. Yeast multiplies under favourable conditions which rises the dough.

  2. Yeast absorbs water and rises the dough.

  3. Yeast gets dissolved in the dough.

  4. Yeast is to be separated out later from the dough.
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A Correct answer
Explanation

Yeast multiplies rapidly under favorable conditions (warmth, moisture, and food in the idli batter), producing carbon dioxide gas through fermentation. This CO2 gets trapped in the dough, causing it to rise and become soft and fluffy. Yeast doesn't just absorb water, get dissolved, or need to be separated - its fermentation and growth are what make the idli batter rise and become spongy.

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