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Why do organisms need water?
Organisms need water for the following reasons:
(i) All cellular processes need water as a medium. Usually, the reactions that take place in our body or within the cells occur between substances that are dissolved in water.
(ii) Since most of the substances are transported in a dissolved form, water is necessary.
What is the major source of fresh water in the city/town/village where you live?
River is a major source of fresh water.
Do you know of any activity which may be polluting this water source?
The discharge of waste water from homes, industries, hospitals, etc. into the river pollutes this fresh water source.
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