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NCERT Solutions For Class 7 Geography Chapter 4 Air

Hi Students, I am making this post for all of you, here you get NCERT Solutions for Class 7 Geography Chapter 4 Air with questions and answers PDF. I write this post which may help you increase your knowledge in your subject and gain marks in your upcoming exam.

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Class 7 Questions and Answers to difficult questions are here. You will use them to help you in your exam preparation. NCERT Solutions for Class 7 Social Science Geography Chapter 4 And you will get information about all these subjects NCERT Solutions for Class 7 Geography Chapter 4 Air Familiarises Reading Sharing about the Motions of the Earth which introduces you to the questions that will come in your board exams.

NCERT Solutions For Class 7 Geography Chapter 4 Air

NCERT Solutions For Class 7 Geography Chapter 4 Air

Use the Class 7 SST Geography Chapter 4 NCERT Solutions and get to know different concepts involved Make your learning experience enjoyable by preparing Read this post completely and try to solve it yourself and then see the answer. NCERT Solutions for Class 7 Social Science Geography Chapter 4 On The Trial of the Earliest People is here to cover all the latest syllabus in all this. Going by the NCERT Class 7 Geography Chapter 4 Questions and Answers it will be very easy for all students to appear for the exam with a lot of confidence

Air Class 7 Questions and Answers Geography Chapter 4

Answer the following questions.

Question 1.

(i) What is the atmosphere?
(ii) Which two gases form the bulk of the atmosphere?
(iii) Which gas creates the greenhouse effect in the atmosphere?
(iv) What is the weather ?
(v) Name three types of precipitation.
(vi) What is the air pressure?

Answer:

(i) Our earth is surrounded by a vast blanket of air called the atmosphere. All living beings on this earth depend on the atmosphere for their existence.
(ii) Nitrogen and Oxygen form the bulk of the atmosphere. The amount of both these gases together is 99% in the atmosphere.
(iii) Carbon dioxide gas creates the greenhouse effect in the atmosphere.
(iv) The hour-to-hour, day-to-day condition of the atmosphere is called weather.

(v) Three types of precipitation are:

  • Convectional rainfall
  • Orographic rainfall
  • Cyclonic rainfall

(vi)The pressure exerted by the weight of air on the earth’s surface is known as air pressure.

Tick the correct answer.

Question 2. (i) Which of the following gases protects us from the harmful sun rays?

(A) Carbon dioxide
(b) Nitrogen
(c)Ozone

Answer: (c) Ozone

Question 2. (ii) The most important layer of the atmosphere is :

(a)Troposphere
(b) Thermosphere
(c) Mesosphere

Answer: (a) Troposphere

Question 2. (iii) Which of the following layers of the atmosphere is free of clouds?

(a) Troposphere
(b) Stratosphere
(c) Mesosphere

Answer: (b) Stratosphere

Question 2. (iv) As we go up the layers of the atmosphere, the pressure

(a) Increase
(b) Decrease
(c) Remains the same

Answer: (b) Decreases

Question 2. (v) When the precipitation comes down to the earth in the liquid form:

(a) Cloud
(b) rain
(c) snow

Answer: (b) Rain

Match the following.

Question 3.

Column IColumn II
1. Trade Winds(a) Permanent wind
2. Loo(b) Local wind
3. Monsoon(c) Seasonal wind
4. Wind(d) Horizontal movement of air

Answer:

  1. (c)
  2. (d)
  3. (a)
  4. (b)

Question 4. Give Reasons.

(i) Wet clothes take longer time to dry on a humid day.
(ii) Amount of insolation decreases from equator toward poles.

Answer:

(i) On a humid day, evaporation from wet clothes takes place slowly due to the low temperature. Therefore, wet clothes take longer time to dry on a humid day.
(ii) Insolation comes through vertical rays at the equator. As we go up from the equator towards the poles, the sun’s rays become slanting. The slanting rays take up more space; The degree of hotness is felt lesser. Hence the amount of insolation decreases from the equator towards the poles.

Question 5. For fun.

(i) Solve this crossword puzzle with the help of the given clues:

ncert solutions for class 7 geography chapter 4 crossword puzzle
AcrossDown
6. An Indian tree having extraordinary quality  of providing oxygen round the clock1. Amount of water vapour in air
8. Gas present in atmosphere occupying only 0.03% by volume2. Condensation of water vapours around dust  particles in atmosphere
11. Outermost layer of atmosphere3. Example of local wind blowing in summer in  northern India
12. Mixture of many gases4. Short term changes in atmosphere
14. Life giving gas5. Precipitation in liquid form
15. Air in motion7. Blanket of air around the earth
16. An indian tree valued highly for medicinal  properties9. Instrument to measure pressure
18. Gas protecting us from harmful sunrays10. Incoming solar radiation
19. Low pressure area13. Reduces visibility in winters
17. It is time when sun is overhead

Hints

  1. Humidity
  2. Clouds
  3. Looo
  4. Weather
  5. Rain
  6. Peepal
  7. Atmosphere
  8. Carbon dioxide
  9. Barometer
  10. Insolation
  11. Exosphere
  12. Air
  13. Fog
  14. Oxigen
  15. Wind
  16. Neem
  17. Noon
  18. Ozone
  19. Cyclones

(ii) Make a weather calender for a week. Use pictures or symbols to show different kinds of weather. You can use more than one symbol a day, if the weather changes. For example, the sun comes out when it stops raining. An example is given below :

NCERT Solutions For Class 7 Geography Chapter 4 Very Short Question And Answers

  • Question 1. How does carbon dioxide create green house effect? [V. Imp.]
    Answer: Crbon dioxide creates greenhouse effect by trappeing the heat radiated from the earth.
  • Question 2. What is the significance of greenhouse gas?
    Answer: Without the greenhouse gas the earth would have been too cold to line in.
  • Question 3. What is an important feature of Stratosphere?
    Answer: Stratosphere contains a layer of ozone gas.
  • Question 4. How is ozone important for us? [Imp.]
    Answer: It protects us from the harmful effect of the sunrays.
  • Question 5. Where is air pressure highest?
    Answer: Air pressure is highest at the sea level.
  • Question 6. How does air move?
    Answer: Air moves from high pressure areas to low pressure areas.
  • Question 7. What happens when air is heated?
    Answer: When air is heated, it expands, becomes lighter and goes up.
  • Question 8. What is the nature of cold air?
    Ans. It has tendency to go down.
  • Question 9. Why do green plants use carbon dioxide? [Imp.]
    Answer: Green plants use carbon dioxide to make their food and release oxygen.
  • Question 10. What is temperature?
    Answer: The degree of hotness and coldness of the air is known as temperature.
  • Question 11. What is insolation?
    Answer: Insolation is the incoming solar energy intercepted by the earth.
  • Question 12. Why is there no air pressure on the moon?
    Answer: There is no air on the moon and therefore no air pressure.

NCERT Solutions For Class 7 Geography Chapter 4 Long Question And Answers

Q.1) Give an account of the composition of the atmosphere. [V. Imp.]
Answer. Our atmosphere is mainly made up of two gases- Nitrogen (78%) and Oxygen (21%). Other gases such as carbon dioxide, helium, ozone, argon and hydrogen are found in smaller quantities. Apart from these gases, small dust particles are also present in the air.

Q.2) How do Bacteria help plants use nitrogen? [V. Imp.]
Ans. Nitrogen is essential for the survival of the plant. But plants cannot take nitrogen directly from the air. Bacteria, that live in the soil and roots of some plants, take nitrogen from the air and change its form so that plants can use it.

Q.3) Write a short note on the distribution of air pressure in the atmosphere. [Imp.]
Answer. Air pressure is the pressure exerted by the weight of the air on the surface of the earth. As we go higher in the layers of the atmosphere, the pressure drops rapidly. The air pressure is highest at sea level and decreases with height. The horizontal distribution of air pressure is affected by the temperature of the air at a given location. In areas where the temperature is high, the air gets heated and rises. This creates an area of low pressure. In areas of low temperature, the air is cold, so it is heavy. The heavy air sinks and forms an area of high pressure.

Q.4) Why do astronauts wear special protective suits when they go to the moon?
Ans. Astronauts wear special protective space suits filled with air when they go to the moon. If they did not wear these space suits, the counter pressure exerted by the body of the astronauts would make the blood vessels burst. The astronauts would bleed.

Q.5) How is rainfall important for us? What happens when there is excess rain? [V. Imp.]
Ans. Rainfall is very important for the survival of plants and animals. It brings fresh water to the earth’s surface. If rainfall is less, there is water scarcity which sometimes causes drought like situation. If there is excess rain, floods take place which makes the life of the affected people miserable.

Q.6) How does nature balance our life? What is the result if this balance is disturbed?[V. Imp.]
Answer. Green plants use carbon dioxide and release oxygen to make their food. Human beings or animals release carbon dioxide. The amount of carbon dioxide released by humans or animals is roughly equal to the amount used by plants which creates a perfect balance. But burning of fuel upsets this balance, adding billions of tons of carbon dioxide to the atmosphere. As a result, the increased amount of carbon dioxide is affecting the weather and climate of the earth.

Q.7) Why is temperature in cities much higher than that of villages ?
Ans. In cities, we find high rise buildings. The concrete and metals in these buildings and the asaphalt of roads get heated up during the day. This heat is released during the night.
Another reason is that the crowded high rise buildings of the cities trap the warm air and thus raise the temperature of the cities.

NCERT Solutions for Class 7 Geography Chapter 4 pdf

NCERT Solutions for Class 7 Geography Chapter 4 Air PDF

For NCERT Solutions for Class 7 Social Science Geography Chapter 4 Air, you may click on the link below and get your NCERT Solutions for Class 7 Social Science Geography pdf file.

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