Question : How milk is changed into curd, if a few drops of curd is added to it? What is the reason for its sourness ?

Question : How milk is changed into curd, if a few drops of curd is ad

1.	Question : How milk is changed into curd, if a few drops of curd is added to it? What is the reason for its sourness ?
Answer» Solution :The change is BROUGHT by Lactobacilluslactis, a bacterium PRESENT in the curd.The sourness is due to the FORMATION of LACTIC acid.