ICSE BoardEnglish MediumSTD 9BIOLOGYHygiene - [A Key to Healthy Life]2 Marks
Question
How are cockroaches and rats harmful to humans?
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Answer
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.
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