Question

Foam accumulated in the surface of sales kept for a long time in summer ????

Answer 1

During summer days,temperature is favourable for the microbial growth .

Food items like dal kept out for a long time create the same favourable environment

As the microbes start growing in the food items,certain chemical reactions take place.

These chemical reactions in food like dal are responsible for the foam accumulation. This signifies the unwanted microbial growth.

Hence, foam accumulates on the surface of dal kept for a long time in summer