NCERT Solutions for Class 6 Social Science Geography Chapter 1 The Earth in the Solar System

NCERT Solutions for Class 6 Social Science Geography Chapter 1 The Earth in the Solar System

Question 1.
Answer the following questions briefly:
(a) How does a planet differ from a star?
(b) What is meant by the ‘Solar System’?
(c) Name all the planets according to their distance from the sun.
(d) Why is the Earth called a unique planet?
(e) Why do we see only one side of the moon always?
(f) What is the Universe?
Answer:
(a) Difference between a Planet and a Star

Planet	Star
1. It receives heat and light from the Sun.	1. It has its own heat and light.
2. It has a spherical body. Planets only reflect the light received from the Sun.	2. It is a very big and hot ball of fire made of gases. The Sun is also a Star.
3. Planets do not twinkle because they do not possess their own light.	3. It gives out huge flames. It radiates a great amount of heat and light.
4. There are nine major planets. Our Earth is also one of them.	4. Stars are very far from us. They are in millions of millions.

(b) Meaning of Solar System
The sun, the planets, and satellites together with other minor bodies make up the solar system. The sun is at the center of the solar system. The planets revolve around the sun in their fixed orbits. The satellites revolve around the planets.
(c) Planets according to their distance from the Sun
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, 2003UB313.
(d) The Earth is called a unique planet because of the following reasons:
Earth is called a unique planet because

1. Conditions favorable to support life are found only on the earth; it is neither too hot nor too cold.
2. Earth has surface water, which is very necessary for our survival.
3. It has life-giving oxygen and the ozone layer, which protect us from the harmful rays, of the sun.

(e) We see only one side of the moon always because of the following reasons:

• The moon revolves round the earth in 27 days.
• It spins on its axis exactly in 27 days.
• Hence the places on the moon correspond to the places on the earth always.
• Because of these reasons we see only one side of the moon always.

(f) Universe
The Universe is the whole body of stars, planets, satellites, and gases. It is endless. Stars are huge bodies of glowing gases e.g. sun. Planets and satellites do not have heat and light of their own. They are lit by the light of the stars.

Question 2.

Tick the correct answer:
(a) The planet is known as the “Earth’s Twin” is
(i) Jupiter
(ii) Saturn
(iii) Venus

(b) Which is the third nearest planet to the sun?
(i) Venus
(ii) Earth
(iii) Mercury

(c) All the planets move around the sun in a
(i) Circular path
(ii) Rectangular path
(iii) Elliptical path

(d) The Pole Star indicates the direction to the
(i) South
(ii) North
(iii) East

(e) Asteroids are found between the orbits of
(i) Saturn and Jupiter
(ii) Mars and Jupiter
(iii) The Earth and Mars

Answer:
(a) → (iii) Venus
(b) → (ii) Earth
(c) → (iii) Elliptical path
(d) → (ii) North
(e) → (ii) Mars and Jupiter

Question 3.
Fill in the blanks.
(a) A group of_____________ forming various patterns is called______________ .
(b) A huge system of stars is called______________ .
(c) _________________ is the closest celestial body to our Earth.
(d) _________________ is the third nearest planet to the Sim.
(e) Planets do not have their own______________ and______________ .

Answer:
(a) stars, constellation
(b) galaxy
(c) Mercury
(d) Earth
(e) heat and light

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NCERT Solutions for Class 6 Social Science Geography Chapter 1 Multiple Choice Questions

Choose the correct option to complete the statements given below:
(i) Full moon night occurs once every……….
(a) day
(b) 15 days
(c) 20 days
(d) month.

(ii) The Hindi word for the New Moon night is ……….
(a) Amavasya
(b) Krishna Paksha
(c) Poornima
(d) none of these.

(iii) The sun is …………
(a) a star
(b) a celestial body
(c) the head of the solar system
(d) all of these.

(iv) Ursa Major is a/an
(a) star
(b) constellation
(c) galaxy
(d) asteroid.

(v) Which of these was a planet till 2006 but is now a “dwarf planet”?
(a) Neptune
(b) The Sun
(c) Pluto
(d) Solaris.

(vi) The term “Blue Planet” indicates the presence of
(a) land
(b) water
(c) oxygen
(d) all of these.

Answers:
(i)—(d),
(ii)—(a),
(iii)—(d),
(iv)—(b),
(v)—(c),
(vi)—(b).

Fill in the Blanks.

Fill in the blanks with appropriate words to complete each sentence:

1. The Amavasya night occurs about ………..  days after the Poomima night.
2. Stars are celestial bodies that are ………..  and ………….
3. The planets do not possess their own ………..  and …………
4. The Small Bear constellation is better known as the ………….
5. The Greek word which is the origin of the word “planets” means ………….
6. Three planets having rings around them are …………, ………., and …………
7. ……..  are elongated fixed paths in which a celestial body always remains.
8. Venus is similar to the earth in its ……….  and ………….
9. The shadows on the moon’s surface are due to ……….., ………, and …………
10. Meteoroids heat up and bum due to …………

Answers:

1. fifteen
2. big, hot
3. heat, light
4. Saptarishi
5. wanderers,
6. Jupiter, Saturn, Uranus
7. Orbits
8. size, shape
9. mountains, plains, depressions
10. friction.

True/False:

State whether these sentences are true (T) or false (F).

1. The Sun appears bigger and brighter than the other stars because it is indeed so.
2. Saptarishi and Ursa Major are two different constellations.
3. The Pole Star is known to have a fixed position in the sky.
4. The earth is the only planet that has a natural satellite.
5. Pluto was declared a “dwarf planet” in August 2006.
6. The earth is the third-largest planet in the solar system.
7. The geoid shape is not perfectly spherical.
8. The moon takes about the same time in rotating about its axis once as it does to complete a revolution around the earth.

Answers:

1. False
2. False
3. True
4. False
5. True
6. False
7. True
8. True.

Class 6th Geography NCERT Chapter 1 Very Short Answer Type Questions

1. Name two celestial bodies visible only in the night sky.
Answer: The moon and the stars are celestial bodies visible in the night sky.

2. Why do we not feel the heat and light of the stars, even though they are so big and hot?
Answer: We do not feel the heat and light of the stars since they are very far away.

3. From which Greek word is the word ‘planet’ derived?
Answer: The word ‘planet’ is derived from the Greek word ‘Planetai’.

4. What does the solar family consist of? [V. Imp.]
Answer:  The solar family consists of the sun, planets, their satellites, and asteroids and meteoroids.

5. What is the shape of the orbits in which planets revolve around the sun?
Answer: The orbits of planets are elliptical (Le. elongated) in shape.

6. Which planet is called “Earth’s twin” and why?
Answer: Venus is called “Earth’s twin” because it is similar to Earth in its shape and size.

7. What is “Geoid”?
Answer: A sphere with its ends flattened at poles (just like earth) is called the geoid.

8. Why is earth called “blue planet”? [V. Imp.]
Answer: Earth appears blue from when seen from the outer space since it has over 2/3^rd water. So it is called the blue planet.

9. How much time does the moon take to revolve once around the earth?
Answer: The moon takes approximately 27 days to revolve once around the earth.

10. What is the difference between the moon and INSAT?    [V. Imp.]
Answer: The moon is a natural satellite of the earth while INSAT is an artificial satellite.

11. What are asteroids?
Answer: Asteroids are the numerous tiny celestial bodies which revolve around the sun and are mainly found between the orbits of Mars and Jupiter.

12. What is a meteoroid?
Answer: Small pieces of rocks which move around the sun are called meteoroids.

The Earth In The Solar System Class 6 Chapter 1 Short Answer Type Questions

1. Name the two extreme shapes of the moon. When and at what intervals do they occur?
Answer: The moon is seen in its two extreme shapes on the Full Moon night arid the New Moon night. The Full Moon. The Full Moon means the moon in its full circular shape. The New Moon. The New Moon means the moon that can not be a seer. The New Moon occurs on the fifteenth day and the Full Moon occurs on the last day of the Hindi calendar month.

2. What is the Pole Star? How can the Saptarishi be used to locate it?  [Imp.]
Answer: The Pole Star is the star that is known to retain its position in the sky always. We can locate the position of the Pole Star with the help of the constellation Saptarishi. If an imaginary line is drawn joining the “pointer stars” of the Saptarishi and extended further, it will point to the Pole Star.

In the Fig. 1.3 shown here, 1 and 2 represent the “pointer stars”. The Pole Star and the pointer stars lie on the same line.

3. Write a short note on the two planets nearest to the sun.
Answer: Mercury. It is the nearest planet to the sun. It takes just about 88 earth days to revolve once around the sun. It is extremely hot since it is close to the sun. It is also the smallest planet. Venus. It is the second closest planet to the sun. It is similar to earth in shape and size. It is called “Earth’s twin”.

4. How does earth support life?   [V. Imp.]
Answer: The earth has conditions that support life. It is neither too hot nor too cold. It has both water and air, which are both indispensable for life. Presence of oxygen in the air in an appropriate proportion supports life. These factors make the earth a unique planet.

Class 6 Geography Chapter 1 Long Answer Type Questions

1. Write short notes on the following:
(a) The sun
(b) The moon
(c) Galaxy.  [V. Imp.]
Answer:
(a) The sun is considered the “head” of the solar system. It is a star, although it is smaller and less bright than most other stars. It is a huge celestial body made up of extremely hot gases. It provides heat and light for the whole of the solar system. Life on earth depends on many factors, and the sunlight is one of them. The sun is about 150 million kilometers away from the earth.

(b) The moon is the only natural satellite of our planet earth. Its diameter is just about a quarter of the earth’s diameter. It is comparatively closer (3,84,400 kilometers away) to earth than all other celestial bodies. It does not support life. It revolves around the earth and rotates about its own axis in about the same time, due to which only one side of the moon is visible to us.

(c) Galaxy is a term that refers to billions of stars, clouds of dust and gases, and other celestial bodies considered as a single unit. The only bigger unit in the universe, galaxies make up the universe. The galaxy we live in is called the Milky Way.

2. Draw a diagram showing the eight planets of the solar system in their orbits around the’ sun. Also prepare a table mentioning the length of their days and years.
Answer:

NCERT Solutions