Contents
Key Stage 2
Meaning

A type of micro-organism called Euglena.
A micro-organism is a living creature so small that it cannot be seen with the eyes.
About Micro-organisms
- There are millions of types of micro-organism.
- Some micro-organisms are good for us. They live in our digestive system and help digest food.
- Some micro-organisms can make us ill. They can cause infections, rashes and sickness.
- We use certain micro-organisms to make foods. Cheese and yoghurt are made by adding micro-organisms to milk. Bread and alcohol are all made by adding micro-organisms to sugary food.
Key Stage 3
Meaning
A micro-organism is a unicellular organism.
About Micro-organisms
- There are millions of types of micro-organism.
- Some micro-organisms are good for us. They live in our digestive system and help digest food.
- Some micro-organisms can make us ill. They can cause infections, rashes and sickness.
- Some common micro-organisms you should know:
Key Stage 4
Meaning
A micro-organism is a unicellular organism.
About Micro-organisms
- There are millions of types of micro-organism.
- Some micro-organisms are good for us. They live in our digestive system and help digest food.
- Some micro-organisms can make us ill. They can cause infections, rashes and sickness.
- Some common micro-organisms you should know: