{"id":24660,"date":"2023-02-14T12:50:14","date_gmt":"2023-02-14T07:20:14","guid":{"rendered":"https:\/\/icsesolutions.com\/?p=24660"},"modified":"2023-02-15T09:59:29","modified_gmt":"2023-02-15T04:29:29","slug":"icse-solutions-for-class-9-geography-earth-as-a-planet","status":"publish","type":"post","link":"https:\/\/icsesolutions.com\/icse-solutions-for-class-9-geography-earth-as-a-planet\/","title":{"rendered":"ICSE Solutions for Class 9 Geography – Earth As a Planet"},"content":{"rendered":"
ICSE Solutions<\/a>Selina ICSE Solutions<\/a>ML Aggarwal Solutions<\/a><\/p>\n Exercises<\/strong><\/span><\/p>\n I. Short Answer Questions<\/strong><\/p>\n Question 1.<\/strong><\/span> Question 2.<\/strong><\/span> Question 3.<\/strong><\/span> Question 4.<\/strong><\/span> Question 5.<\/strong><\/span> Question 6.<\/strong><\/span> Question 7.<\/strong><\/span> Question 8.<\/strong><\/span> Question 9.<\/strong><\/span> Question 10.<\/strong><\/span> Question 11.<\/strong><\/span> Question 12.<\/strong><\/span> Question 13.<\/strong><\/span> Question 14.<\/strong><\/span> Question 15.<\/strong><\/span> Question 16.<\/strong><\/span> Question 17.<\/strong><\/span> Question 18.<\/strong><\/span> II. Fill in the blanks<\/strong><\/p>\n III. Long Answer Questions<\/strong><\/p>\n Question 1.<\/strong><\/span> <\/p>\n (a)<\/strong> What does the picture show you about the earth ? Answer:<\/strong><\/span><\/p>\n (a)<\/strong> The picture shows the spherical shape of the earth.<\/p>\n (b)<\/strong> Three pillars of equal height were put along the Bedford Level canal area in England each at 5 kms. interval. After observation it came to know that the middle pole was higher than the sideward poles. This proved that the earth\u2019s surface was curved and the earth is a spherical body.<\/p>\n (c)<\/strong> The times of sunset and sunrise are different in the different part of the earth, because the earth moves from west to east and the places situated in the east get sunrise first. Japan is called the land of rising sun, as it is in the eastern-most part of the Eastern Hemisphere and the date starts from the Eastern Hemisphere. It proves that the earth is spherical.<\/p>\n (d)<\/strong> The atmosphere is indispensable for life on earth, as it provides air to inhale ; rainfall and fresh waterbodies after the hydro logical cycle. Moreover, it absorbs the extremely hot ultraviolet rays of the sun and makes the temperature ideal on earth. Other planets are either very hot or very cold due to the absence of atmosphere.<\/p>\n Question 2.<\/strong><\/span> Question 3.<\/strong><\/span> Question 4.<\/strong><\/span> (a)<\/strong> Atmosphere Answer:<\/strong><\/span><\/p>\n (a) Atmosphere \u2014<\/strong> Atmosphere play very important role in making earth a habitant planet. Atmosphere plays following role:<\/p>\n (b) Water \u2014<\/strong> 70% of the earth\u2019s surface is covered by water. Water plays following role :<\/p>\n (c) Temperature \u2014<\/strong> The earth is the third planet from the sun. It has an average temperature of 17\u00b0C which is suitable for life to exist. If the average temperature on the earth\u2019s surface changes by only a few degrees, many species would perish due to extreme heat or cold.<\/p>\n Question 5.<\/strong><\/span> Question 6.<\/strong><\/span> <\/p>\n (a)<\/strong> What is meant by the Solar System ? Answer:<\/strong><\/span> (b)<\/strong><\/p>\n (c)<\/strong> The planets within the asteroids belt i.e. Mercury, Venus, Earth and Mars, are called the Terrestrial planets.<\/p>\n (d)<\/strong><\/p>\n (e)<\/strong> The satellites are the celestial bodies that revolve around the planets.<\/p>\n Question 7.<\/strong><\/span> Question 8.<\/strong><\/span> A Star :<\/strong><\/p>\n Practice Questions (Solved)<\/strong><\/span><\/p>\n Question 1.<\/strong><\/span> Question 2.<\/strong><\/span> Question 3.<\/strong><\/span> Question 4.<\/strong><\/span> Question 5.<\/strong><\/span> Question 6.<\/strong><\/span>
\nHow can you prove that the earth is a sphere by looking at the Pole Star ?
\nAnswer:<\/strong><\/span>
\nThe Pole Star can be seen at an angle of 90\u00b0 at the North Pole, as it lies directly at the line of axis of the earth, while its angle decreases towards the Equator i.e. it is 0\u00b0 at the equator. It is only possible in an quarter arc of a circle. It proves that the earth is a sphere with circular surface.<\/p>\n
\nBriefly describe the shape of the earth.
\nAnswer:<\/strong><\/span>
\nThe earth has got a spherical shape, slightly bulging at the equator and flattened at the poles. The spherical shape is confirmed by the arrival of a ship seen first by its mast and later on the ship. The satellite picture of the earth, shadow of the earth on the moon as circular, and the views of circular horizons from the height etc. all these prove the spherical shape of the earth.<\/p>\n
\nWhat is the earth\u2019s mean temperature ? State its one advantage.
\nAnswer:<\/strong><\/span>
\nThe earth\u2019s mean temperature is 17\u00b0 C, which is ideal to support the survival of the life-system.<\/p>\n
\nWhy is the earth called a watery planet ?
\nAnswer:<\/strong><\/span>
\nThe earth is called a watery planet, as its major part i.e. 70% is covered by water or hydrosphere. The earth is seen blue in the satellite pictures due to the majority of water.<\/p>\n
\nWhat is \u2018biosphere\u2019 ?
\nAnswer:<\/strong><\/span>
\nBiosphere is the narrow zone of contact amidst lithosphere, hydrosphere and atmosphere.<\/p>\n
\nName the conditions necessary for life on earth.
\nAnswer:<\/strong><\/span>
\nThe conditions necessary for life on earth, are ideal temperature range with an average between 10\u00b0C and 35\u00b0C, solar radiation, humidity, wind, water, land etc.<\/p>\n
\nGive any two features of the earth that make it a \u2018Unique Planet\u2019.
\nAnswer:<\/strong><\/span>
\nThe earth is so for the only planet which consists of life- system. It is due to its ideal average temperature of 17\u00b0C to support the life and provide with atmosphere and hydrosphere to impart air and water essential for life.<\/p>\n
\nWhy is the planet Venus hotter than the planet Mercury?
\nAnswer:<\/strong><\/span>
\nVenus is hotter than Mercury because the atmosphere around Venus is mainly composed of carbon dioxide. The carbon dioxide produces Greenhouse effect on the surface of Venus. Thus, the tempreature on its surface remain very high.<\/p>\n
\nName the two sources of heat in the interior of the earth.
\nAnswer:<\/strong><\/span>
\nTwo sources of heat in the interior of the earth are the radioactive elements trapped inside and the immense temperature and pressure in the deep interior.<\/p>\n
\nWhat is meant by Terrestrial Life ?
\nAnswer:<\/strong><\/span>
\nOn the surface of the earth, there are continents and oceans. The life on the continents or on land is called \u2018Terrestrial Life\u2019.<\/p>\n
\nName the members of the Solar System.
\nAnswer:<\/strong><\/span>
\nMembers of the solar system includes the Sun and everything that orbits it like planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn,.Uranus and Neptune), their satellites, asteroids, comets, interplanetary gas and dust.<\/p>\n
\nWhat is a planet ?
\nAnswer:<\/strong><\/span>
\nA planet is a rocky or gaseous mass that revolves around a star.<\/p>\n
\nWhat is meant by Inner Planets ? Name them.
\nAnswer:<\/strong><\/span>
\nThe planets that lie within the asteroid belt that is Mercury, Venus, Earth and Mars are called the inner planets.<\/p>\n
\nWhy are the inner planets called the terrestrial planets?
\nAnswer:<\/strong><\/span>
\nThe inner planets are called the terrestrial planets because their structure is similar to that of the earth.<\/p>\n
\nWhat are Jovian planets ? Name them.
\nAnswer:<\/strong><\/span>
\nThe planets whose structure is similar to that of Jupiter are – called Jovian planets. They have ring systems around and have a large number of moons. They are of gaseous origin. Saturn, Uranus and Neptune are Jovian planets.<\/p>\n
\nHow big is the sun ? Describe its size with respect to the earth.
\nAnswer:<\/strong><\/span>
\nThe sun is a star or a ball of hot gases. Its diameter is 1,392,000 km. i.e. 110 times larger than that of earth and its volume is 1.3 million times larger than the earth.<\/p>\n
\nDistinguish the earth from the other planets in one important aspect.
\nAnswer:<\/strong><\/span>
\nOur earth is also called a Tonely-planet\u2019 because of its one important aspect having extensive life system.<\/p>\n
\nHow did the earth get its atmospheric blanket ?
\nAnswer:<\/strong><\/span>
\nIn the beginning, at the time of evolution of the planets, the earth was also a body of burning clouds of gases and dust. After cooling process, the heavy elements subsided downwards and the gases floated upwards and formed the atmosphere around the earth as a blanket.<\/p>\n\n
\nStudy the picture and answer the questions that follow.<\/p>\n
\n(b)<\/strong> State briefly the Bedford Level Experiment.
\n(c)<\/strong> The sun rises and sets at different times in different places. What does the statement show about the shape of the earth.
\n(d)<\/strong> In what way is the earth\u2019s atmosphere beneficial to mankind ?<\/p>\n
\nProvide reliable evidence to prove that the earth is spherical in shape.
\nAnswer:<\/strong><\/span>
\nThe earth can be clearly seen spherical in the photographs from the satellite. Other proofs are the sight of the mast of a ship first before the ship appears, varying heights of the poles fired at different places at an interval of 5 km, through the Bedford Level Experiment and the sight of Pole Star at 90\u00b0 from North Pole and the view of the earth\u2019s horizon as circular from higher attitudes.<\/p>\n
\nGive the distinctive features of the earth as a unique planet. Also give three points of comparison with respect to other planets.
\nAnswer:<\/strong><\/span>
\nThe earth possesses all the essential features necessary for maintaining the life-system. It is provided with atmosphere and hydrosphere along with the lithosphere. Moreover the average temperature of 17\u00b0C is ideal for survival. Three points of comparison with respect to other planets are as follows.<\/p>\n\n
\nDescribe the role of each of the following in making earth a habitable planet.<\/p>\n
\n(b)<\/strong> Water
\n(c)<\/strong> Temperature<\/p>\n\n
\n
\nName the different realms of the earth.
\nAnswer:<\/strong><\/span>
\nThe different realms of the earth are lithosphere, hydrosphere and atmosphere.<\/p>\n
\nStudy the picture and answer the questions that follow.<\/p>\n
\n(b)<\/strong> Give two differences between a planet and a star.
\n(c)<\/strong> Name the planets known as terrestrial planets.
\n(d)<\/strong> Give two advantages the earth has over other planets.
\n(e)<\/strong> What are satellites ?<\/p>\n
\n(a)<\/strong> The sun along with eight planets and asteroids forms the Solar System.<\/p>\n\n
\n
\nWrite a short note on the planets of the Solar System. Name the planets in order of their distance from the sun.
\nAnswer:<\/strong><\/span>
\nThere are total eight planets included in the solar system which revolve around the sun in their particular elliptical tracks. According to their distance from the sun from near to far, these are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.<\/p>\n
\nDistinguish between a planet and a star.
\nAnswer:<\/strong><\/span>
\nA Planet :<\/strong><\/p>\n\n
\n
\nIn which unit the distances of universe are measured ?
\nAnswer:<\/strong><\/span>
\nLight year.<\/p>\n
\nHow much time does a ray of sunlight take to reach the Earth ?
\nAnswer:<\/strong><\/span>
\n8 minutes approximately.<\/p>\n
\nHow much time does a ray of moonlight take to reach the Earth ?
\nAnswer:<\/strong><\/span>
\nOne second approximately.<\/p>\n
\nHow many planets are there in the Solar System ?
\nAnswer:<\/strong><\/span>
\nEight<\/p>\n
\nName the largest planet of the Solar System.
\nAnswer:<\/strong><\/span>
\nJupiter.<\/p>\n
\nName the planet closest to the Sun.
\nAnswer:<\/strong><\/span>
\nMercury<\/p>\n