0Microbiology is the study of organisms that can only be seen through the microscope. These living beings are called microorganisms as they can not be seen with eyes alone and they are both friends and enemies of human beings. The major groups of these small living things are-
1. Bacteria
2. Fungi
3. Algae
4. Virus
5. Protozoa
Some microorganisms are useful to us while some are infectious causing harm to the plants, animals and humans. They can reduce the harvest and infect the livestock.
Pathogens are the disease causing microorganisms. They can enter the body though air, water or food. The other media of communication are physical contact with an infected person or animal. The diseases caused due to this contact are called communicable diseases.
The insects and animals that carry the micobes are called carriers.
Q. Have you seen a rotten potato?
Q. Can you eat food cooked a few days back that was not refrigerated?
Q. Why do the elders advise to keep a handkerchief on mouth while sneezing?
