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प्रश्न
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?
उत्तर
Moulds are commonly present in the air, water, etc. Hence, they were already present when moist bread was kept covered with the bell-jar.
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