Microorganisms

1.Rohit had idli in his breakfast today. He said," It is very soft and fluffy today. Please, give me one more." His mother gave him one more but he ate only half. His mother said," When you  could eat only half, why did you take one."
a)According to you what made the idli soft and fluffy?
b)Which organism is responsible for making idli soft and fluffy?
c)Which process is involved here?
d)Why did her mother say,"Why did you take one?"

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