Q1 of 19 Page 142

An example of water-borne disease is _________.

Water-borne diseases are those diseases which spread through contaminated drinking water. Typhoid is caused by bacteria Salmonella typhi. This disease occurs when the excreta from someone who is suffering from typhoid get mixed with the drinking water used by the people living nearby.

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_________ is the chief component of natural gas.

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The bar-graph indicates the prevalence / widespread attack of infectious diseases in two cities A and B. Observe it and answer the questions given below:

1. Dengue fever 2. Rat fever


3. Cholera 4. Chikungunya


a. What may be the reason for the disease in city A?


b. Which city needs a more effective system of waste-disposal and cleaning?


c. How can the disease be controlled in city A?