Rachna Sapra solutions for जॉग्रफी [इंग्रजी] इयत्ता ९ आईसीएसई chapter 11 - Composition and Structure of Atmosphere [Latest edition]

Which of the following gases protects us from the harmful ultraviolet rays?

The most stable and calm layer of the atmosphere is ______.

Which of the following layers of the atmosphere has the presence of clouds?

Ozone hole is found above the continent of ______.

Which of the following chemicals is banned from use in refrigerators and air conditioners?

______ is considered the most stable layer of atmosphere.

The percentage of carbon dioxide in the atmosphere is ______.

The burning of ______ has contributed to the phenomena of global warming.

Statement I: The Stratosphere has ozone gas.

Statement II: The temperature increases in the Stratosphere.

Which of the following is not an effect of global warming?

Which of the following has been the cause of global warming?

The ozone hole is the largest over ______.

Which of the following layers of the atmosphere help in the burning of meteors?

Which layer of the atmosphere records the lowest temperature?

Which layer of the atmosphere is also called the changing sphere?

Which of the following layers does not belong to the Homosphere?

Pick the incorrect statement in the context of the presence of water vapour in the atmosphere.

Exosphere is the most rarefied layer of the atmosphere. Which of the following factors is responsible for this fact?

Assertion (A): Carbon dioxide and water vapours are found only in the lower layers of atmosphere.

Reason (R): Carbon dioxide and water vapour are meteorologically important gases.

Assertion (A): Carbon dioxide is a greenhouse gas.

Reason (R): It is transparent to the incoming solar radiation and opaque to the outgoing terrestrial radiation.

Assertion (A): The Troposphere is also called the ‘changing sphere’.

Reason (R): All weather changes take place in the troposphere.

Assertion (A): Troposphere extends to a height of 18 kilometres at the equator and about 8 kilometres at the poles.

Reason (R): Earth’s axis is tilted.

Assertion (A): The Atmosphere is divided into five layers.

Reason (R): The Atmosphere is divided into layers on the basis of temperature conditions.

Read the graph carefully and answer the following questions.

1. Name the atmospheric layers in which temperature rises with altitude.
2. In which layers of the atmosphere does the temperature fall with increasing altitude?

Read the given text and answer the questions that follow:

The combustion of fossil fuels increases the number of suspended particles in the air. The suspended particles could be unburned carbon particles or substances called hydrocarbons. The presence of high levels of these pollutants causes visibility to be lowered, especially in cold weather, when water also condenses in the air to form smog.

1. Mention the solid particles in the air, other than the unburned carbon particles and hydrocarbons.
2. What is the role of solid particles in the air?

Name the five layers of the atmosphere.

Which layer is the most rarified?

What are chlorofluorocarbons (CFCs)?

Why does the atmosphere become thinner with altitude?

Why is the height of tropopause over the equator more than that over the poles?

What is the Greenhouse effect?

Suggest four ways to control global warming.

Give three points of significance of the Earth’s atmosphere.

Mention the role of forests and plants in controlling global warming?

What is the role of plants in the utilization of carbon dioxide and the release of oxygen?

What is the composition of the Earth’s atmosphere?

Give reasons.

Temperature decreases with increasing height in the troposphere.

Give reasons.

Temperature increases in the stratosphere.

Mention the role of dust particles in the troposphere.

Mention the role of water vapour in the troposphere.

Suggest two ways to save the ozone layer from depletion.

State two prime properties of the ionosphere.

Why the jet aircrafts do not fly in the troposphere?

How does the ionosphere help in long-distance communication?

Name two prime elements which control weather and climate.

Name the solid particles that are present in the atmosphere. State their significance.

In which layer of the atmosphere is the ozone gas present?

Why is the ozone depletion a major cause of alarm?

Give the significance of the troposphere.

What is the commercial use of Argon gas?

What role does Nitrogen play in the growth of plants?

Name the atmospheric layer which helps in long-distance communication? Give a reason for the same.

Divide the atmosphere into two parts on the basis of its composition. Bring out the difference between the two parts.

The greenhouse effect is the process by which greenhouse gases absorb and delay the loss of heat to space, thus keeping the lower troposphere warm.

1. Name the greenhouse gases.
2. What is the positive role that these gases play on the Earth’s surface?