Multiple choice question XXX — task. Science CBSE, Class 7.

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Wheat dough if left in the open, after few days, starts to emit a foul smell and becomes unfit for use. Give reason.

1. Why does wheat dough left in the open start to emit a foul smell after a few days?

The dough absorbs moisture from the air, causing it to spoil.
Carbohydrates in the dough encourage the growth of saprophytic fungi and yeast.
Chemical reactions in the dough produce noxious gases.
Bacteria present in the air contaminate the dough, leading to spoilage.

2. What is the primary cause of the foul smell emitted by spoiled wheat dough left in the open?

Rapid decomposition by enzymes in the dough
Chemical reactions between wheat proteins and air pollutants
Growth of saprophytic fungi and yeast, breaking down carbohydrates
Interaction of wheat gluten with atmospheric moisture

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