Page 254 - New Medley 4 Semester 1

1 • Remembering

Write True or False.

1. A microscope shows the enlarged image of microbes.
2. All bacteria are harmful to us.

3. Protozoa are single-celled animals.

HARMFUL MICROBES

The harmful microbes are called germs. They cause diseases.

m Harmful bacteria cause diseases like Viral fever
cholera, tuberculosis, tetanus, typhoid

and pneumonia.

m Viruses cause diseases like polio,
chickenpox, measles, viral fever, common
cold, etc.

m The parasitic protozoa cause diseases
like dysentery, malaria, gingivitis, etc. Measles Common cold Polio

m The harmful fungi cause food poisoning Diseases caused by viruses in humans

and skin diseases like ringworm.

Germs enter our body in different ways, such as:
m Breathing in dirty air having germs.

m Through cuts and wounds.

m By drinking unclean water or eating unhygienic
food. Breathing in dirty air

m Through the bite of an infected animal, for example, the germs of rabies enter

our body through the bite of a rabid dog.

PROTECTION FROM HARMFUL MICROBES

To keep ourselves fit and healthy, we need to protect
ourselves from harmful microbes. To do this, we must:

m Eat fresh food and drink clean water.

m Keep our body and surroundings clean.

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