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Write note on the following: 1. Curdling of milk 2. Fermentation |
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Answer» (i) Curdling of milk: Curdling is a process in which liquid gradually turns into solid, forming clumps along the way. Take hot milk in a pan and add few drops of curd, in few minutes milk curdles forming lumpy solid masses. We can even add lemon extract to the hot milk to effect curdling immediately, but the taste and texture of the curd will not be the same as that of the curdling occurring in a few hours. (ii) Fermentation: Fermentation is the process in which microorganisms such as yeast and certain bacteria break down sugar solution into alcohol and carbon-di-oxide. It is an irreversible process as the alcohol fosned cannot be turned back into sugar. Thus, fermentation is a chemical change. |
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