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Explain differences between pure air and polluted air.

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Pure air	Polluted air
1. Pure air contains around 78% nitrogen, 21% oxygen and 0.03% carbon dioxide.	1. Polluted air has no such definite composition of these gases.
2. Other gases such as argon, methane, ozone, and water vapours are also present in small quantities.	2. Polluted air has harmful gases like nitrogen dioxide, sulphur dioxide, carbon monoxide, particulate matter etc.
3. It is fresh and healthy for lungs.	3. It can cause respiratory diseases.

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Explain differences between pure air and polluted air.

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The Living World

Biological Classification

Plant Kingdom

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Morphology of Flowering Plants

Anatomy of Flowering Plants

Structural Organisations in Animals

Cell : The Unit of Life

Biomolecules

Cell Cycle and Cell Division

Transport in Plants

Mineral Nutrition

Photosynthesis in Higher Plants

Respiration in Plants

Plant Growth and Development

Digestion and Absorption

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Body Fluids and Circulation

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Principles of Inheritance and Variation

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Evolution

Human Health and Disease

Strategies for Enhancement in Food Production

Microbes in Human Welfare

Biotechnology Principles and Processes

Biotechnology and its Applications

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Environmental Issues

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Environmental Issues

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