Short Answer Questions. How is carbon dioxide a useful gas for life on earth? The earth’s atmosphere contains 99 per cent oxygen, which is essential for life. Carbon dioxide, helium, ozone, argon and hydrogen are found in lesser quantities. 2. Carbon dioxide is produced by all animals, fungi and microorganisms during respiration and is used by plants during photosynthesis. These MCQ's are extremely … The rate at which the temperature drops in the troposphere is 1°C per 165 metres. 2. 21 per cent of the atmosphere is composed of. To Access the full content, Please Purchase. (a) Oxygen (b) Nitrogen (c) Argon (d) Carbon dioxide. Question 2. Multiple choice question(i) Which one of the following gases constitutes the major portion of the atmosphere? Correct : The earth’s atmosphere contains 21% per cent oxygen, which is essential for life. The air is a mixture of sev-eral gases. The majority of the atmosphere is made up of nitrogen (78%) and oxygen (21%). What is the troposphere? These particulates help in the scattering of solar radiation which adds varying charming colour of red and orange at dawn and dusk. ICSE Solutions for Class 9 Geography – Composition and Structure of the Atmosphere ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions Exercises I. The atmosphere is made up of 78% nitrogen, 21% oxygen, and smaller amounts of argon, carbon dioxide, helium, and neon. False. 3. State any three characteristics of the mesosphere. Thus, we waste valuable energy which is generally produced by burning coal and petroleum. Extramarks offers notes & NCERT solutions of Composition and Structure of Atmosphere for CBSE Class 11. The atmosphere consists of almost concentric layers of air. Tiny dust particles are also present in the air, apart from the above gases. 4. Nitrogen:It is the gas that is most abundant in the air. Multiple choice questions. • The height of the atmosphere is estimated between 16 to 29 thousand kilometers from the sea level. What is the difference between the troposphere and the tropopause? State the gaseous composition of the […] The small solid particles present in the atmosphere originate from different sources and include sea salts, fine soil, smoke-soot, ash, pollen, dust and disintegrated particles of meteors. Please enable Cookies and reload the page. Answer: Troposphere is the lowest layer of the atmosphere. Answer: The main characteristics of stratosphere are: (a) There are no clouds or weather changes so it is safe for air travel. It extends from the top of stratosphere upto a height of 80 km above the earth. This gas protects us from the harmful ultraviolet radiation. This per cent of the atmosphere is composed of nitrogen. The thermosphere is the layer of the atmosphere that help in radio transmission. The other gases that are present in small quantities are: Carbon dioxide (0.03%), Argon (0.93%) and Others ( helium, hydrogen, ozone). False. Answer: The list of the similar things that we do without realizing that we are destroying our environment and the ways that we can behave differently and save are : 1. The stratosphere is the lowest layer of the atmosphere. How is apparent depth and real depth related to refractive index? The air that we breathe is a mixture of many gases like oxygen, nitrogen, carbon dioxide, argon etc. ... Geography Voyage for Class 7 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines. cbse class vii science air composition and structure of the atmosphere. It contains life-giving gases like Oxygen for humans and animals and carbon dioxide for plants. Question Discuss the importance of the different layers of the atmosphere ? These SAQ's are extremely critical for all ICSEstudents to score better marks. The air is one among the necessary conditions for the existence of life on this planet. 1. Think of the ways that we can behave differently. Answer: The earth is the only planet in the universe that has life. Correct : The temperature drops at the rate of 1°C per 165 metres in the atmosphere. What is the composition of the air that we breathe? Google Nitrogen and oxygen are two gases which make up the most of the atmosphere. As you know, the burning of these fuels release gases that pollute the atmosphere. Answer: The lowest layer of atmosphere is called troposphere where as the boundary between the troposphere and the stratosphere is called tropopause. Atmospheric … (ii) Draw a suitable diagram for the structure of the atmosphere and label it and describe it. The gases like Nitrogen, Oxygen, Argon, Carbon dioxide, Neon, Helium etc, contribute to the Earth’s atmosphere. Answer: The blanket of air surrounding the earth is called the atmosphere.The atmosphere primarily comprises nitrogen and oxygen in bulk and other gases like carbon dioxide, helium, ozone, etc in lesser quantities. Generally, atmosphere extends up to about 1600 km from the earth’s surface. All the best! The Stratosphere layer is very dry as it contains little water vapour. Selina Concise Geography Voyage Class 7 Chapter 3 Composition and Structure of the Atmosphere Solutions. Geography Voyage for Class 7 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines. The air that we breathe is a mixture of many gases like oxygen, nitrogen, carbon dioxide, argon etc. State any three characteristics of the stratosphere. Answer: The important gases that are found in atmosphere are nitrogen, oxygen, carbon-dioxide, hydrogen, helium and argon. AKHINA.P B.ED Geography 2. Question 3. Answer. Answer: (b) Nitrogen Question 1(ii). Question 1. • CBSE Class 7 Social Science - The Composition and Structure of the Atmosphere. The air encompasses the earth from all sides. Answer: The blanket of air upto 1500 km surrounding the earth is known as atmosphere. The other gases that are present in small quantities are: Carbon dioxide (0.03%), Argon (0.93%) and Others ( helium, hydrogen, ozone). The upper part of the thermosphere is called the ionosphere. 1. Atmosphere Composition and Structure Notes The domain of Air on the Earth GEOGRAPHY 9 ATMOSPHERE COMPOSITION AND STRUCTURE Earth is a unique planet because the life is found only on this planet. The ionosphere contains electrically charged particles called ions, which help in transmitting communication signals. The thickness of the atmosphere is only about 2% Marks:1. Essential Question: How do I describe the structure and composition of our atmosphere? The air surrounding the earth is called the atmosphere. This layer provides some advantages for flight because it is above stormy weather and has steady, strong, horizontal winds. Welcome to The Earth's Atmosphere General Knowledge Quiz! Except for water vapor, whose atmospheric abundance varies from practically zero up to 4%, the fractions of the major atmospheric components N 2, O 2, and Ar are remarkably uniform below about 100 km.At greater heights, diffusion becomes the principal transport process, and the lighter gases become relatively more abundant. Question 1. What is the ozone layer? The air encompasses the earth from all sides. To Access the full content, Please Purchase. Question 1(i). Answer: If you would like to see what the earth would look like, take a look at the moon, with all its craters. Answer: It has a band of ozone gas which protects the sun’s harmful U.V. E. Answer the following questions in brief. It would have been too cold for life to exist on this planet without greenhouse effect. APlusTopper.com provides step by step solutions for ICSE Solutions for Class 7 Geography Voyage. 4. It protects us from the harmful radiations of the Earth. Carbon dioxide, helium, ozone, argon and hydrogen are found in lesser quantities. cbse class vii science air composition and structure of the atmosphere. Answer. Q1. What is known as atmosphere ? Answer. True. 1. The questions involved in Oxford University Press Solutions are important questions that can be asked in the final exam. How is the presence of ozone layer essential to preserve life on earth? This layer has lowest temperature in the atmosphere reaches -100°C at its end. Answer: A supersonic aircraft fly in stratosphere. The atmosphere is made up … Dorothy M Noronhe Class 7 Geography Chapter 3 Composition & Structure Of The Atmosphere Solutions is based on the latest syllabus prescribed for these classes by the Inter-State Board of Anglo-Indian Education and recommended by CISCE, New Delhi. Composition of Air. It is also useful gas as it creates the greenhouse effect. Short Answer Questions. Read to know more about the structure of the atmosphere in this article for … One of the reasons why life exists on this planet is an encompassing blanket of gases called the atmosphere. Question What would happen to the earth if the atmosphere disappeared ? Along with carbon dioxide and methane, water vapour is a potent greenhouse gas. It protects us from the heat of sun during day and keeps the earth warm at night ozone. Upon completion of this lesson, students will be able to: 1. define 'atmosphere' 2. list the layers of Earth's atmosphere 3. describe key features of each layer of the atmosphere 4. summarize the gaseous makeup of Earth's atmosphere This contains 10 Multiple Choice Questions for UPSC Test: Composition And Structure Of Atmosphere (mcq) to study with solutions a complete question bank. This is your solution of Composition of the Atmosphere Class 7 Video | EduRev search giving you solved answers for the same. Correct : The stratosphere extends from the top of the troposphere up to 50 km above the surface of the earth. 5. 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