Class 8 Science Our Home: Earth, A Unique Life-Sustaining Planet 1 Mark Questions
1 Mark Questions for Class 8 Science Our Home: Earth, A Unique Life-Sustaining Planet. Try first, then reveal the answer. These are exam-oriented practice items, not copied board papers.
Practice questions aligned to NCERT topics used in CBSE classrooms. These are original exam-oriented questions for revision — not official CBSE board papers and not a guarantee of any exam question. Always match the textbook issued by your school and the latest PDFs on ncert.nic.in and cbseacademic.nic.in.
Answers opened: 0
Practice set
Q1MCQ1 markEasyRevision pick
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. CBSE often tests a concept by asking a daily-life example from the same chapter
B. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
C. Atmosphere, water and suitable temperature
D. Earth is unique in the solar system for life as we know it
Answer
C. Atmosphere, water and suitable temperature
Explanation
Atmosphere, water and suitable temperature. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q2MCQ1 markEasy
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
B. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
C. Ozone and atmosphere as in the lesson
D. Protect the planet
Answer
C. Ozone and atmosphere as in the lesson
Explanation
Ozone and atmosphere as in the lesson. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q3MCQ1 markEasy
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Earth is unique in the solar system for life as we know it
B. The Goldilocks idea in school language: not too hot, not too cold
C. Every chapter ends with keywords or a summary that is useful for one-mark answers
D. Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start
Answer
A. Earth is unique in the solar system for life as we know it
Explanation
Earth is unique in the solar system for life as we know it. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q4MCQ1 markEasy
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Protect the planet
B. Use the terms used in the NCERT book; do not replace them with unofficial names
C. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
D. CBSE often tests a concept by asking a daily-life example from the same chapter
Answer
A. Protect the planet
Explanation
Protect the planet. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q5MCQ1 markModerateRevision pick
Choose the correct statement related to The Goldilocks idea in school language in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. The Goldilocks idea in school language: not too hot, not too cold
B. Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet
C. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
A. The Goldilocks idea in school language: not too hot, not too cold
Explanation
The Goldilocks idea in school language: not too hot, not too cold. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q6MCQ1 markEasy
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Protect the planet
B. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
C. Every chapter ends with keywords or a summary that is useful for one-mark answers
D. Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start
Answer
B. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
Explanation
Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q7MCQ1 markEasy
Choose the correct statement related to Textbook first in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. The textbook says the opposite of this statement
B. CBSE often tests a concept by asking a daily-life example from the same chapter
C. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
D. Use the terms used in the NCERT book; do not replace them with unofficial names
Answer
C. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
Explanation
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q8MCQ1 markEasy
Choose the correct statement related to Keywords in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. This happens only in a laboratory and never in daily life
B. Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet
C. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
Answer
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
Explanation
Every chapter ends with keywords or a summary that is useful for one-mark answers. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q9MCQ1 markEasyRevision pick
Choose the correct statement related to Examples in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Atmosphere, water and suitable temperature
B. This idea is not part of the NCERT chapter
C. Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start
D. CBSE often tests a concept by asking a daily-life example from the same chapter
Answer
D. CBSE often tests a concept by asking a daily-life example from the same chapter
Explanation
CBSE often tests a concept by asking a daily-life example from the same chapter. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q10MCQ1 markModerate
Choose the correct statement related to Diagrams in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Use the terms used in the NCERT book; do not replace them with unofficial names
B. The textbook says the opposite of this statement
C. Ozone and atmosphere as in the lesson
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Explanation
If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q11MCQ1 markEasy
Choose the correct statement related to Revision in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start
B. Earth is unique in the solar system for life as we know it
C. This happens only in a laboratory and never in daily life
D. Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet
Answer
A. Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start
Explanation
Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q12MCQ1 markEasy
Choose the correct statement related to Accuracy in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Atmosphere, water and suitable temperature
B. This idea is not part of the NCERT chapter
C. Use the terms used in the NCERT book; do not replace them with unofficial names
D. Protect the planet
Answer
C. Use the terms used in the NCERT book; do not replace them with unofficial names
Explanation
Use the terms used in the NCERT book; do not replace them with unofficial names. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q13MCQ1 markEasyRevision pick
Choose the correct statement related to Practice in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Ozone and atmosphere as in the lesson
B. The textbook says the opposite of this statement
C. Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet
D. The Goldilocks idea in school language: not too hot, not too cold
Answer
C. Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet
Explanation
Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q14MCQ1 markEasy
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
B. This happens only in a laboratory and never in daily life
C. Atmosphere, water and suitable temperature
D. Protect the planet
Answer
C. Atmosphere, water and suitable temperature
Explanation
Atmosphere, water and suitable temperature. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q15MCQ1 markModerate
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Every chapter ends with keywords or a summary that is useful for one-mark answers
B. Atmosphere, water and suitable temperature
C. Ozone and atmosphere as in the lesson
D. The Goldilocks idea in school language: not too hot, not too cold
Answer
C. Ozone and atmosphere as in the lesson
Explanation
Ozone and atmosphere as in the lesson. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q16MCQ1 markEasy
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Earth is unique in the solar system for life as we know it
B. CBSE often tests a concept by asking a daily-life example from the same chapter
C. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
D. Ozone and atmosphere as in the lesson
Answer
A. Earth is unique in the solar system for life as we know it
Explanation
Earth is unique in the solar system for life as we know it. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q17MCQ1 markEasyRevision pick
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Earth is unique in the solar system for life as we know it
B. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
C. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
D. Protect the planet
Answer
D. Protect the planet
Explanation
Protect the planet. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q18MCQ1 markEasy
Choose the correct statement related to The Goldilocks idea in school language in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start
B. The Goldilocks idea in school language: not too hot, not too cold
C. Protect the planet
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
Answer
B. The Goldilocks idea in school language: not too hot, not too cold
Explanation
The Goldilocks idea in school language: not too hot, not too cold. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q19MCQ1 markEasy
Choose the correct statement related to Our Home: Earth, A Unique Life-Sustaining Planet in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
B. Ozone and atmosphere as in the lesson
C. This topic is only for college
D. The Goldilocks idea in school language: not too hot, not too cold
Answer
A. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
Explanation
Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q20MCQ1 markModerate
Choose the correct statement related to Textbook first in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
A. Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet
B. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
C. Our Home: Earth, A Unique Life-Sustaining Planet is an NCERT chapter taught in CBSE Class 8 Science
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
B. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
Explanation
Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q211 Mark1 markEasy
Define or state: Keywords.
Answer
Every chapter ends with keywords or a summary that is useful for one-mark answers.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q221 Mark1 markEasy
Define or state: Examples.
Answer
CBSE often tests a concept by asking a daily-life example from the same chapter.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q231 Mark1 markEasy
Define or state: Diagrams.
Answer
If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q241 Mark1 markEasy
Define or state: Revision.
Answer
Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q251 Mark1 markModerate
Define or state: Accuracy.
Answer
Use the terms used in the NCERT book; do not replace them with unofficial names.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q261 Mark1 markEasy
Define or state: Practice.
Answer
Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q271 Mark1 markEasy
Define or state: Our Home: Earth, A Unique Life-Sustaining Planet.
Answer
Atmosphere, water and suitable temperature.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q281 Mark1 markEasy
Define or state: Our Home: Earth, A Unique Life-Sustaining Planet.
Answer
Ozone and atmosphere as in the lesson.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q291 Mark1 markEasy
Define or state: Our Home: Earth, A Unique Life-Sustaining Planet.
Answer
Earth is unique in the solar system for life as we know it.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q301 Mark1 markModerate
Define or state: Our Home: Earth, A Unique Life-Sustaining Planet.
Answer
Protect the planet.
Explanation
A one-mark answer should use the textbook term and one clear fact — not a long paragraph.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q61Assertion and Reason1 markModerate
Assertion (A): CBSE often tests a concept by asking a daily-life example from the same chapter.
Reason (R): Examples is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q62Assertion and Reason1 markModerate
Assertion (A): If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
Reason (R): Diagrams is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q63Assertion and Reason1 markModerate
Assertion (A): Write three points from Our Home: Earth, A Unique Life-Sustaining Planet in your own words; that is enough for a short-answer start.
Reason (R): Revision is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q64Assertion and Reason1 markDifficult
Assertion (A): Use the terms used in the NCERT book; do not replace them with unofficial names.
Reason (R): Accuracy is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q65Assertion and Reason1 markModerate
Assertion (A): Mix MCQs with short answers so you remember both facts and explanations from Our Home: Earth, A Unique Life-Sustaining Planet.
Reason (R): Practice is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q66Assertion and Reason1 markModerate
Assertion (A): Atmosphere, water and suitable temperature.
Reason (R): Our Home: Earth, A Unique Life-Sustaining Planet is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q67Assertion and Reason1 markModerate
Assertion (A): Ozone and atmosphere as in the lesson.
Reason (R): Our Home: Earth, A Unique Life-Sustaining Planet is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q68Assertion and Reason1 markDifficult
Assertion (A): Earth is unique in the solar system for life as we know it.
Reason (R): Our Home: Earth, A Unique Life-Sustaining Planet is a key idea in the chapter Our Home: Earth, A Unique Life-Sustaining Planet.
Choose the correct option.
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Answer
A. Both A and R are true, and R is the correct explanation of A.
Explanation
Read Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Meta
Class: Class 8 · Subject: Science · Chapter: Our Home: Earth, A Unique Life-Sustaining Planet · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
FAQs
Are these official CBSE board questions?
No. They are original practice questions aligned to NCERT topics used in CBSE classrooms. Official sample papers are published on cbseacademic.nic.in.
Will these questions appear in the board exam?
Nobody can promise a question. Use them for revision of frequently tested concepts and exam-style practice.
Is the chapter list the latest NCERT list?
Yes, the catalog follows current NCERT textbooks used in CBSE schools (including new middle-stage books such as Ganita Prakash and Curiosity). Always match the book issued by your school.
How should I use the 100 questions?
Try the question first, then tap Show answer. Mix MCQs with long answers. Revise formulas and diagrams from the textbook alongside this set.
Where are NCERT solutions?
Open the NCERT-style practice link on this subject or chapter. For word-for-word textbook exercise answers, use the NCERT book itself; we do not copy solution keys from other websites.
What is the suggested URL pattern?
Hub /cbse/, then /cbse/class-8/, then subject and chapter slugs.
Why is this a separate URL?
So students searching for “1 Mark Questions” land on a filtered set, while the chapter page remains the full 100-question bank. Same facts, different search intent.
Today's 3-step path
Follow this loop every day: mixed test, current affairs, then today's subject. A new set arrives tomorrow.
