Question

Formation of milk into curd is an example of __________
a) reversible changes
b) irreversible changes
c) chemical changes
d) both (b) and (c)

Answer 1

Answer:

b is the correct

option f

Explanation:

r this question

Answer 2

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Irreversible changes

↬ Milk converts to curd due to the production of lactic acid. This process of conversion of milk to curd occurs due to the action of bacteria Lactobacillus that form lactic acids from sugars present in the milk.

↬ Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. Here curd forms because of the chemical reaction between the lactic acid bacteria and casein. During fermentation, the bacteria use enzymes to produce energy (ATP) from lactose.