Microorganisms: Friend or Foe?
Class 8 Science: microorganisms: friend and foe
Some microbes make curd and bread; others cause malaria and spoil food. Sort them into friends and foes.
Words to know
- Microorganism
- A living thing too small to see without a microscope.
- Fermentation
- Microbes turning sugar into alcohol or acid, as in making bread and curd.
- Pathogen
- A microbe that causes disease.
- Vaccine
- Weakened microbes that train the body to fight a disease.
Quick check
Answer 3 questions to check what you learned.
Try at home
With an adult, add a spoon of curd to warm milk and leave it overnight. In the morning you have curd: bacteria did the work!