Question

19. What happens when milk is left open at room temperature during
summers ?​

Answer 1

Answer:

When the milk is left at room temperature, the oxidation reaction occurs and the growth of microorganisms occur due to which it gets sour.

Answer 2

Answer:

When milk is left at room temperature in summers it creates an ideal condition of the growth of bacterium called lactobacillus which is responsible for the formation of curd. ... of bacterium first milk become sour and then formation of curd takes place. It is a Chemical Process.