Water: A Wonder Liquid
Chapter Name : Natural Resources |
Sub Topic Code : 103_09_14_03_02 |
Topic Name : Water: A Wonder Liquid |
|
Sub Topic Name : Water Pollution |
|
Introduction
Addition of undesirable substances in water is termed as water pollution. It adversely affects the life forms.
Pre-Requisites:
Various water bodies.
Real Life Question:
Why marine life is decreasing day by day?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Causes of water pollution | Addition of fertilizers and pesticides from farms into water bodies pollutes the water. Also poisonous substances such as mercury salts which are released from industries causes water pollution. |
| Removal of useful substances | Water pollution removes dissolved oxygen and important nutrients from water which is important for various aquatic organisms. |
| Temperature change | Aquatic organisms require certain temperature for survival. Any change in the temperature of water bodies by addition of hot water from industries or release of water from dams affects the life forms. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Go to a nearby water body such as a lake or a pond | Check if it has presence of any garbage or any polluting material in it. If there is any kind of pollution, see if there are any kind of fishes in that water body. |
Real life uses :
Many species of marine fishes and plants have got extinct and many are endangered due to water pollution.
Places to visit :
Ponds, lakes, rivers, etc
Practical examples around us
| Examples | Explainations |
|---|
What you learn in Theory:
Water pollution is caused by addition of harmful substances from farms or industries into water bodies. It also removes dissolved oxygen and nutrients from water necessary for survival of marine life.
What you learn in Practice:
How water pollution is caused and how it affects life forms?