how did the mould get inside the bell jar ?

Dear student,       
Please find below the solution to the asked query       

When kept inside the jar, the piece of bread develops a mould on it. The spores of bread mould get inside the jar whenever the bread is exposed to air. These spores germinate and form bread mould. However, in an air-tight jar, the growth of mould is slower as compared to the bread kept in open.

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