Study the following statements regarding lactic acid bacteria (LAB) which are used to convert milk i

Question

Study the following statements regarding lactic acid bacteria (LAB) which are used to convert milk into curd.\ (i) They produce acids that coagulate and partially digest the milk proteins.\ (ii) A small amount of curd added to the fresh milk as an inoculum contains millions of LAB, which at suitable temperature, multiply and convert milk into curd.\ (iii) Conversion of milk into curd improves its nutritional quality by increasing vitamin $\mathrm{B}_{12}$.\ (iv) LAB may result in acidity in the stomach of human beings. Which of the given statements are correct?\

Professor PC Thomas Classes · Answer

(c): Microbes such as Lactobacillus and others commonly called lactic acid bacteria (LAB) grow in milk and convert it into curd. During growth, such bacteria produce acids (mainly lactic acid) that coagulate and partially digest the milk proteins. A small amount of curd, known as starter, is added to the milk and kept at suitable temperature, where lactic acid bacteria multiply in millions and converts milk into curd that also improves its nutritional quality by increasing vitamin $B_{12}$. It also checks growth of disease causing microbes in the stomach.