Essential Concepts in Environmental Science

The video explores Earth's unique ability to support life, focusing on the biosphere's components: lithosphere, hydrosphere, and atmosphere. It discusses renewable and non-renewable resources, emphasizing the importance of sustainable use. The composition and significance of air, water, and soil are detailed, highlighting their roles in sustaining life. The video also covers the importance of forests as biodiversity storehouses and their environmental services.

What is the biosphere?

• The water bodies on Earth's surface

• The life-supporting zone where atmosphere, hydrosphere, and lithosphere interact

• The outer crust of the Earth

• A layer of gases surrounding the Earth

Which of the following is a renewable resource?

• Sunlight

• Coal

• Natural gas

• Petroleum

Why can renewable resources become exhaustible?

• They are not affected by human activities

• They are used faster than they are renewed

• They are always available in abundance

• They are not naturally replenished

What is the main component of air on Venus and Mars?

• Water vapor

• Carbon dioxide

• Nitrogen

• Oxygen

Which gas is essential for plants to make food?

• Carbon dioxide

• Nitrogen

• Helium

• Oxygen

Where is most of the Earth's fresh water found?

• In underground reservoirs

• In the atmosphere

• In oceans

• In ice caps and snow-covered mountains

Why is water essential for organisms?

• It is a source of energy

• It provides structural support

• It is used for breathing

• It is a medium for biological reactions

What is the top layer of Earth's crust called?

• Lithosphere

• Soil

• Core

• Mantle

What percentage of the world's surface is covered by forests?

• 20-25%

• 10-15%

• 40-45%

• 32-35%

What is the recommended forest cover for a country?

• 30-35%

• 40-45%

• 20-25%

• 10-15%