1.Milk is turned into curd by bacteria.
2. To make milk as curd , we need to add little pre -made curd into Luke warm milk.
3. Curd contains several micro organisms including Lactobacillus bacterium .
4. Lactobacilli bacteria promote the formation of curd from milk.
5.When little pre-made curd is added to warm milk, the Lactobacilli bacteria present in curd multiply and convert into curd.
6.Lacto bacillus bacteria convert the lactose sugar into lactic acid. This lactic acid converts milk into acid.
8.The optimum temperature for the Lacto Bacillus bacteria to convert milk into curd is 40⁰C.
9.If the milk is too hot bacteria can die and if it is too cold the bacteria cannot multiply.