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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 celestial bodies consisting of the Sun, its planets, satellites, asteroids, meteoroids and dust particles form the Solar System.
(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:
(e) We see only one side of the moon always because of the following reasons:
(f) Universe
We see millions of millions of stars, planets, satellites, asteroids, meteoroids, forming galaxies. Innumerable galaxies form the universe. In other words, we can say that all these celestial bodies form the universe.
Question 2.
Tick the correct answer:
(a) The planet 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 a ………..
(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 sun.
(e) Planets do not have their own ……….. and ………
Answer:
(a) stars, constellation
(b) galaxy
(c) Mercury
(d) Earth
(e) heat and light
Question 1.
Do you wonder why can’t we see the moon and all those bright tiny objects during the day time? (NCERT Page 1)
Answer:
Because the light of the sun in day time is so bright that we cannot see these tiny bright shining objects of the night skies.
Question 2.
Ask someone elder in your family or neighbourhood to show you more stars and planets in the sky.
Answer:
Question 3.
What do animals and plants require in order to grow and survive? (NCERT Page 5)
Answer:
In order to grow and survive animals and plants require, heat and energy, oxygen, water and food.
Question 4.
Look at the full moon and observe its shadows.
Answer:
Do this exercise yourself on Poornima.
Question 5.
Do you see a whitish broad band like a white glowing path across the sky on a clear starry night?
Answer:
Yes. A whitish broad band is like a white glowing path across the sky. It is a cluster of stars, known as Milky Way. It is our galaxy.