Question

foam accumulates on the surface of Dal kept for long time in summer.give reasons.
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Answer 1

Answer:

In summer, the atmospheric temperature is favourable for microbial growth. Foodstuffs like 'dal' which kept open for a long time favours the growth of microbes

Explanation:

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Answer 2

Answer:

In 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.