Yeast is a useful fungus because it is used in making bread and some antibiotics.
Not all bacteria are harmful. Some of them are very useful for humans, other animals and plants.
Yogurt, cheese and butter are all prepared by using bacteria.
Some bacteria live in our body and help in digestion.
We can preserve food by following ways:
• Processed foods are kept safe as they are sealed in plastic or in tins.
• Some foods can be kept safe from going bad by the use of chemicals.
• Milk can be preserved by a process called pasteurization.
We should always wash our hands before handling and eating food.
Eating unwashed, spoiled food or uncovered food is one of the main way of germs to get in our body and cause different diseases. So we should wash fruits and vegetables before eating them.