---> Look closely at the slice of the bread . Can you see the air space in it ?
The air spaces are caused by carbon dioxide gas given out when yeast acts on the dough . This shows that microorganisms breathe .
---> What happens if you leave a bowl of rice for a few weeks ?
This is what happen ! It will be covered with white patches .
---> Look at this rotten orange .
What can you see on the surface of the orange ?
---> The patches that you see on the rice and orange are actually fungi . The patches become bigger after sometime . This show that mould grow .