Question

Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason. NCERT Class VII Science - Exemplar Problems Chapter 1. Nuitrion in Plants

Answer 1

It's just how it happens to bread if it is kept on a plate e for few days mould starts growing on it that's what happens to the dough

Answer 2

When dough is left in the open give foul smell beacuse of being rancid.

This happens when oxygen present in air reacts with the food, which results in giving foul smell and foul taste.

This also make the food unhealthy and hence, it becomes unfit for use.