A lake is found fully covered with algae and scum. The water from this lake is used by people living nearby it for their household purposes. It is also found that many children are suffering from diarrhea and muscle cramps. As a precaution the doctor advises them not to drink water from the lake, and if at all they use it, it should be boiled and cooled.

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CASE_STUDIESBiotic and Abiotic Components of EcosystemImpact of Human Activities on EnvironmentCBSE PYQ3 sub-questions

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"Excessive use of chemicals and pesticides in agriculture adversely effect the environment." Justify this statement.

TextBiological MagnificationImpact of Human Activities on Environment

A village is located on the bank of the river. For daily activities like drinking, bathing, and irrigation the local community of the village depends on that river. Some people in the village use several pesticides for cropping. However, in recent years, the level of pollution has risen considerably and the water is now contaminated with chemicals from nearby factories, untreated sewage, and plastic waste. As a result, the villagers suffer from many diseases caused by polluted water.

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