If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:
How did the mould get inside the bell-jar?

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Solution

The piece of bread that is placed inside a jar will develop mould because these were already present in the surrounding.

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If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:How did the mould get inside the bell-jar?

The piece of bread that is placed inside a jar will develop mould because these were already present in the surrounding.

If you leave a piece of moist bread covered under a small bell jar at a warm place, mould grows on it in a few days. Answer the following with reference to this observation:
How did the mould get inside the bell-jar?