Question

Curd contains___________.
(A) Ascorbic acid
(B) Tartaric acid
(C) Lactic acid
(D) Acetic acid

Answer 1

Hint: Curd is obtained from milk by coagulating milk through a process called curdling. Generally, milk contains a huge amount of lactose sugar in it. In the process of curd preparation, the lactose in milk is consumed by the bacteria.

Complete step by step solution:
-We know that through fermentation of milk by bacteria we can prepare curd from milk.
-The name of the bacteria involved in the preparation of curd from milk is lactobacillus bacteria.
-Lactobacillus bacteria also called lactic acid bacteria (LAB).
-In the process of fermentation LAB reacts with protein casein present in the milk and forms curd.
-In the process of preparation of curd lactose is going to convert into lactic acid.
-Therefore the acid formed in the process of preparation of curd is lactic acid.

So, the correct option is C.

Additional information:
-Curd has a lot of health and nutritional benefits.
-Eating curd helps our body to stay cool, improves the digestive system, and helps to overcome stomach problems.
-Lactic acid is an organic acid having the molecular formula of ${{C}_{3}}{{H}_{6}}{{O}_{3}}$ .
-Lactic acid is found in sour milk, yoghurt, etc.

Note: During the fermentation of milk, the LAB bacteria produce ATP (adenosine triphosphate) by using lactose in milk. Lactic acid is a byproduct formed during the synthesis of ATP by LAB by using lactose through the fermentation process.