Why do we add an inoculum of curd to milk for curdling it ?

Why do we add alum to purify water ?

Why do we add alum to purify water ?

Assertion (A): An inoculum of curd is used for curdling of milk. Reason (R): It contains Lactobacillus, which improves nutritional quality by increasing Vitamin B_(12)

Why do we group data?

Which of these microbes is used in the inoculum to form curd ?