Class 11 Geography Important Chapter 15 Composition and Structure of the Atmosphere

Class 11 Geography Important Chapter 15 Composition and Structure of the Atmosphere Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 11 Geography Important Solutions and select need one. AHSEC Class 11 Elective Geography Additional Notes English Medium Download PDF. HS 1st Year Finance Important Solutions in English.

Class 11 Geography Important Chapter 15 Composition and Structure of the Atmosphere

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. ASSEB Class 11 Elective Geography Additional Question Answer are part of All Subject Solutions. Here we have given HS 1st Year Elective Geography Important Notes in English for All Chapters, You can practice these here.

Composition and Structure of the Atmosphere

Chapter: 15

FOURTH UNIT: ATMOSPHERE, WEATHER AND CLIMATE

IMPORTANT QUESTION AND ANSWER

Answer The Following Questions:

1. What is Atmosphere?

Ans: The deep gaseous envelope surrounding the Earth’s surface, made up of a mixture of gases that covers land, water, and air elements, is called the atmosphere.

2. How many main components does the climate have?

Ans: The main components of climate are three — temperature, humidity, and pressure.

3. What is meant by Climate?

Ans: The average condition of temperature, humidity, precipitation, and wind observed for at least fifty years over a large area is called climate.

4. How many layers does the atmosphere have? Name them.

Ans: The atmosphere has four layers —

(i) Troposphere.

(ii) Stratosphere.

(iii) Mesosphere.

(iv) Thermosphere.

5. What are the two main causes of the movement of water vapour and formation of clouds and rainfall?

Ans: The two main causes are heat and the presence of dust particles.

6. What is the Homosphere?

Ans: The lower part of the atmosphere, up to about 70 km above sea level, where gases are found in uniform proportion, is called the Homosphere.

7. What is the layer of air extending up to 8–10 km above sea level called?

Ans: The layer of air extending up to 8–10 km above sea level is called the Troposphere.

8. What kinds of particles are found from various sources in the atmosphere?

Ans: The atmosphere contains sea salt, dust and sand particles, smoke, ash, biological spores, and metallic particles.

9. On what does the physical condition of the lower layers of the atmosphere mainly depend?

Ans: It mainly depends on the amount of dust and water vapour present in the air besides gaseous components.

10. What is the chemical symbol of Nitrous Oxide?

Ans: The chemical symbol of Nitrous Oxide is N₂O.

Long Question & Answer:

1. Describe the importance of the atmosphere.

Ans: Air and the atmosphere are essential for all living beings to breathe. The atmosphere protects the Earth from the harmful rays of the Sun and maintains a suitable temperature.It is mainly composed of nitrogen (78.08%) and oxygen (20.95%), both vital for sustaining life.The atmosphere absorbs excessive heat and prevents its escape into space — this process is called the Greenhouse Effect.It regulates rainfall, cloud formation, lightning, and weather balance.Without the atmosphere, life could not exist, as the Earth would either become extremely hot or extremely cold.

2. Explain the gaseous composition of the atmosphere.

Ans: The atmosphere is a mixture of various gases surrounding the Earth. The main gases are Nitrogen (78.08%) and Oxygen (20.95%), making up about 99% of the total atmosphere. Other gases like Argon, Carbon dioxide, Helium, Methane, Krypton, and Xenon are present in small quantities. Nitrogen is not used directly for respiration but helps in maintaining chemical balance.Oxygen is vital for respiration and combustion.Carbon dioxide and Methane are important greenhouse gases that trap heat and regulate temperature.Thus, these gases collectively maintain Earth’s energy balance and life processes.