Chapter 1: The Earth – Our Home
1. Tick (✓) the right answer.
(a) Around 500 years ago, __________ went on a long
sea journey.
Answer: (ii) Magellan ✓
(b) The blanket of air surrounding the Earth is
called the __________.
Answer: (iv) atmosphere ✓
(c) The shape of the Earth is more like __________.
Answer: (ii) a pear ✓
(d) A galaxy is a large group of __________.
Answer: (iii) stars ✓
2. Match the following.
|
Column
A |
Column
B |
|
(a) Milky Way |
(ii) Galaxy |
|
(b) Blue Planet |
(iv) Earth |
|
(c) Orbit |
(v) A planet's fixed path |
|
(d) Atmosphere |
(iii) Layer of air surrounding
the Earth |
|
(e) Three things that support
life |
(i) Air, water, land |
Answers:
- (a) Milky Way → (ii)
Galaxy
- (b) Blue Planet → (iv)
Earth
- (c) Orbit → (v) A
planet's fixed path
- (d) Atmosphere → (iii)
Layer of air surrounding the Earth
- (e) Three things that
support life → (i) Air, water, land
3. Fill in the blanks.
(a) The shape of the Earth is called a __________.
Answer: geoid
(b) The point where land and sky appear to meet is
called the __________.
Answer: horizon
(c) The Earth is often called the __________
planet.
Answer: blue
(d) The Earth spins on an imaginary line called an
__________.
Answer: axis
(e) The movement of the Earth is called __________.
Answer: rotation and revolution
4. Rearrange the jumbled
words.
(a) A vast space which contains thousands of stars,
planets and other heavenly bodies : (VINURSE)
Answer: UNIVERSE
(b) We live on this planet : (TEARH)
Answer: EARTH
(c) The Milky Way is one : (XGALAY)
Answer: GALAXY
(d) The place where land and sea meet : (STOAC)
Answer: COAST
5. Short Answer Questions
(a) What is the universe?
Answer:
The universe is the vast space that contains stars, planets, galaxies, dust,
gases and all forms of life.
(b) What is the shape of the Earth?
Answer:
The Earth is spherical in shape and is called a geoid.
(c) How long does the Earth take to complete one
rotation?
Answer:
The Earth takes 24 hours (one day) to complete one rotation.
(d) What is a galaxy?
Answer:
A galaxy is a large group of stars, clouds and gases.
6. Long Answer Questions
(a) What is the atmosphere?
Answer:
The atmosphere is the blanket or layer of air that surrounds the Earth. It
provides air for breathing and protects us from the Sun's harmful rays and
excessive heat.
(b) What makes the Earth a unique planet?
Answer:
The Earth is a unique planet because:
- It has a suitable
temperature.
- It has plenty of water.
- It is surrounded by an
atmosphere (air).
These
conditions make life possible on Earth.
(c) What is an orbit?
Answer:
An orbit is the fixed path along which a planet moves around the Sun.
(d) What is the difference between rotation and
revolution?
|
Rotation |
Revolution |
|
Rotation is the spinning of the
Earth on its axis. |
Revolution is the movement of
the Earth around the Sun. |
|
It takes 24 hours. |
It takes one year (365 days). |
|
It causes day and night. |
It causes seasons. |
7. HOTS Questions
(a) Why is the Earth called the blue planet?
Answer:
The Earth is called the blue planet because most of its surface is covered with
water, making it appear blue from space.
(b) What changes will you see if the Earth stops
rotating on its axis?
Answer:
If the Earth stops rotating, there will be no day and night. One side of the
Earth will always face the Sun and remain very hot, while the other side will
remain dark and very cold.
(c) What are the three things which help living
things to survive?
Answer:
The three things that help living things survive are:
- Air
- Water
- Land
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