Earth as a System : Energy, Matter, and Life — Important Questions
CBSE · Class 9 · Science
71 important questions from Earth as a System : Energy, Matter, and Life for CBSE Class 9 Science, with answers. Part of the CBSE Class 9 Science syllabus.
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Important Questions from Earth as a System : Energy, Matter, and Life
Which Earth sphere includes all living organisms and their habitats?
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Biosphere
The biosphere includes all living organisms and the places where they live.
What is the main source of energy for life on Earth?
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The Sun
The Sun is the main source of energy on Earth and powers many natural processes.
What is the speed of light in vacuum?
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3×10^8 ms⁻¹
The speed of light in vacuum is 3×10^8 ms⁻¹.
Which type of electromagnetic waves are harmful because they have very high energy?
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Gamma rays and X-rays
Gamma rays and X-rays are high-frequency, short-wavelength waves with very high energy and can be harmful.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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