Question

wheat dough left in the open after few days starts to emit a foul smell and becomes unfit for use give reason

Answer 1

Wheat dough when kept in open for few days, following activities takes place:
                1. formation of fungus
                2. reproduction of yeast
 These fungus and yeast when present in dough, it will become unfit for eatingor for use. Since formation of fungus takes place in dough, so it gives a foul smell.

Answer 2

Hello!!

Here's the answer to your question......

→The microorganisms present in the air grow in the dough and spoil it. Hence it emits foul smell and is unfit for consumption.

Hope this helps.....