Name the group of bacteria involved in setting milk into curd. Explain the process they carry in doing so. Write another beneficial role of such bacteria.

Lactobacillus is involved in settling milk into curd.

At first some amount of curd is placed in a milk which is used as inoculum. The bacteria use the sugar lactose in the milk. Oxidation of lactose to lactic acid takes place. Milk proteins coagulate to form curd. Vitamin B₁₂ is increased by the bacteria in curd.