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Earth's Atmosphere Composition and Functions

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Earth's Atmosphere Composition and Functions

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Questions and Answers

What is the approximate percentage of oxygen in the Earth's atmosphere?

0.9%

78%

21% (correct)

0.03%

Which gas is present in the Earth's atmosphere in the highest percentage?

CO2

Ozone

Nitrogen (correct)

What role does the Earth's atmosphere play in protecting life on Earth?

Absorbing most of the cosmic rays (correct)

Providing oxygen for respiration

Sustaining plant photosynthesis

Maintaining the heat balance

Why is the Earth's atmosphere referred to as a dumping ground for many pollutant materials?

It contains trace elements of various gases Signup and view all the answers

How does the Earth's atmosphere contribute to plant photosynthesis?

By being the source of carbon dioxide Signup and view all the answers

What is the relationship between biosphere and ecosystem based on the text?

Ecosystem is a smaller unit of the biosphere. Signup and view all the answers

Which of the following is NOT a part of the biosphere as described in the text?

Mountains Signup and view all the answers

Why are lower atmosphere, oceans, and soils considered part of the biosphere?

Because they actively exchange materials with living organisms. Signup and view all the answers

Which of the following is characteristic of ecosystems according to the text?

Includes interaction between organisms and their environment in a specific area. Signup and view all the answers

In the context of the text, what makes an ecosystem distinct from the biosphere?

Specific zone and interactions between organisms and their environment Signup and view all the answers