Worksheet: Composition and Structure of Atmosphere | Geography Class 11 - Humanities/Arts PDF Download

Fill in the Blanks

Q1: Carbon dioxide is meteorologically important as it is transparent to incoming solar radiation but opaque to the outgoing terrestrial radiation. It largely contributes to the _______________ effect.

Q2: The uppermost layer of the atmosphere is called the _______________.

Q3: Water vapor decreases with altitude, and in the dry and cold areas of deserts and polar regions, it may be less than _______________ percent of the air.

Q4: Dust particles in the atmosphere include sea salts, fine soil, smoke-soot, ash, pollen, dust, and disintegrated particles of _______________.

Q5: The troposphere, the lowest layer of the atmosphere, is most important for all _______________ activity.

Q6: The layer that absorbs ultraviolet radiation and shields life on Earth from harmful energy is known as the _______________ layer.

Q7: The zone separating the troposphere from the stratosphere is called the _______________.

Q8: The mesosphere extends up to a height of _______________ kilometers.

Q9: The ionosphere is located between _______________ and 400 kilometers above the mesopause.

Q10: The increase in the volume of carbon dioxide in the past few decades is mainly due to the burning of _______________.

Assertion and Reason Based

Q1: Assertion: Carbon dioxide is transparent to incoming solar radiation.
Reason: Carbon dioxide is responsible for the greenhouse effect.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q2: Assertion: The stratosphere contains the ozone layer.
Reason: The ozone layer absorbs ultraviolet radiation.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q3: Assertion: The troposphere contains dust particles and water vapor.
Reason: All changes in climate and weather take place in the troposphere.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q4: Assertion: Water vapor decreases with altitude.
Reason: Water vapor acts as a blanket, preventing the Earth from becoming too cold or too hot.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q5: Assertion: The ionosphere reflects radio waves back to Earth.
Reason: The ionosphere contains electrically charged particles known as ions.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Very Short Answer Type Questions

Q1: What is the greenhouse effect?

Q2: How does carbon dioxide affect the Earth's temperature?

Q3: Where is the ozone layer located in the atmosphere?

Q4: What is the importance of the troposphere?

Q5: What is the tropopause?

Q6: Why is the stratosphere significant for life on Earth?

Q7: What is the mesopause?

Q8: What is the ionosphere, and what is its role?

Q9: How does temperature change with altitude in the mesosphere?

Q10: What is the primary source of increased carbon dioxide in the atmosphere?

Short Answer Type Questions

Q1: Describe the composition of the Earth's atmosphere.

Q2: Explain the role of water vapor in maintaining the Earth's temperature.

Q3: Discuss the distribution of dust particles in the atmosphere.

Q4: Differentiate between the troposphere and the stratosphere in terms of their characteristics.

Q5: What is the significance of the tropopause in the atmosphere?

Q6: Elaborate on the role of the ionosphere and its impact on radio waves.

Q7: Why does the temperature change in the mesosphere as altitude increases?

Q8: Explain the consequences of an increase in the volume of carbon dioxide in the atmosphere.

Long Answer Type Questions

Q1: Describe the composition of the Earth's atmosphere and its role in climate change.

Q2: Discuss the structure of the atmosphere, including its different layers and their characteristics.

Q3: Explain the role of water vapor in the atmosphere, its distribution, and its impact on temperature regulation.

Q4: Analyze the consequences of increased carbon dioxide in the atmosphere, its sources, and its implications for the environment.