Question

easons.
Foam accumulates on a the surface
of 'dal' kept for a long time in
summer. .
Why are naphthalene balls kept with
clothes to be put away.​

Answer 1

n summer, the atmospheric temperature is favourable for microbial growth. Foodstuffs like 'dal' which kept open for a long time favours the growth of microbes. The microbes release various gases as byproduct and these gases form foam on the surface of foodstuffs having more water content.