Our Home: Earth, a Unique Life Sustaining Planet — Important Questions
CBSE · Class 8 · Science
44 important questions from Our Home: Earth, a Unique Life Sustaining Planet for CBSE Class 8 Science, with answers.
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Important Questions from Our Home: Earth, a Unique Life Sustaining Planet
Which of the following make Earth suitable for life? (Select all correct answers)
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Right distance from Sun, Presence of atmosphere, Magnetic field, Presence of liquid water
Earth's right distance from Sun, atmosphere, magnetic field, and liquid water all contribute to making it habitable. Very high gravity would actually be harmful to life.
The ozone layer protects Earth from harmful ultraviolet rays.
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True
The ozone layer acts like a shield, blocking harmful ultraviolet (UV) rays from the Sun that can damage living cells.
Which of the following are parts of Earth's system that support life?
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Atmosphere (air), Hydrosphere (water), Biosphere (living things), Geosphere (rocks and soil)
All four spheres - atmosphere, hydrosphere, biosphere, and geosphere - work together to support life on Earth.
What happens when male and female gametes join in sexual reproduction?
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They form a zygote
When male and female gametes join during fertilization, they form a zygote which develops into a new organism.
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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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