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प्रश्न
How are cockroaches and rats harmful to humans?
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उत्तर
Cockroaches and rats are common household pests.
(i) Cockroaches are involved in spoiling food, paper and cloth. They may act as carriers of viruses, especially those which cause cancer.
(ii) Rats eat grains and other foods. They also act as carriers of certain pathogens. A parasite named rat-fleas lives on rat's skin. It possibly carries the germs of plague.
संबंधित प्रश्न
Typhoid is caused by
Suggest any two methods of controlling flies.
Describe the different ways by which the housefly contaminates our food.
The germ causing Hepatitis is transmitted through
Name the following:
Organisms that cause disease.
Name the following:
Science of maintaining good health.
Explain the following:
Flies should not be allowed to sit on edible things.
Explain the following:
We should breathe through our nose only.
Name the following:
Any disease caused by rats.
The question has four options. Choose the correct answer:
Mosquitoes larvae can be controlled by using:
