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Class 8 Our Home: Earth, a Unique Life Sustaining Planet worksheet
CBSE Science. Why Earth supports life, the four spheres, asexual and sexual reproduction, protecting the planet. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
The Earth can support life mainly because it is at the right distance from the Sun to have:
- no air
- very thick clouds
- only ice
- liquid water
Answer
(d) liquid water
the habitable zone
- 2.
Lakes and ponds belong to the:
- atmosphere
- geosphere
- hydrosphere
- biosphere
Answer
(c) hydrosphere
- 3.
Which of these is a small, rocky planet?
- Saturn
- Jupiter
- Mercury
- Neptune
Answer
(c) Mercury
Section B · short answer
- 4.
Why is the Earth called a unique planet?
Answer
It is the only planet known to support life.
- 5.
Which sphere — atmosphere, hydrosphere, geosphere or biosphere — does each belong to? (a) the ozone layer (b) nitrogen and oxygen gas
Answer
(a) atmosphere (b) atmosphere
Section C · long answer
- 6.
Explain five reasons why the Earth can support life.
Answer
It is at the right distance from the Sun for liquid water; its nearly circular orbit keeps temperatures steady; its gravity holds an atmosphere with oxygen; the ozone layer blocks harmful UV rays; its magnetic field shields it from harmful particles from space.
Fresh sheets for your child
In the app, every Our Home: Earth, a Unique Life Sustaining Planet sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
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