Question

why did the lukewarm milk changes into curd when small amount of curd is added?​

Answer 1

the lactobacillus bacteria is present in curd.

so even when a small amount of curd is added it changes the the rest of the milk to curd by the action of the bacteria.

Answer 2

Answer:

Because of lactose

Explanation:

lukewarm milk changes into curd when small amount of curd is added