Question

When some Wheat dough was left the open for a few days, it started
emiting a foul smell. State, Why?

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Answer 1

Answer:

when it was left in contact with air, it also came in contact with moisture .

Explanation:

when it comes in contact with moisture the fungus gets a suitable environment to grow

that's why it emits a foul smell

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Answer 2

When some wheat dough was left in the open for a few days it started emitting a foul smell due to growth of micro -- organisms .I.e Saprotrophs