MCQ Questions for Class 12 Biology Ecosystem. 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 Ecosystem in the chapter Ecosystem.
A. CBSE often tests a concept by asking a daily-life example from the same chapter
B. Pyramids of number, biomass, energy
C. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
D. GPP, NPP
Answer
D. GPP, NPP
Explanation
GPP, NPP. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q2MCQ1 markEasy
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. 10% law
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. Nutrient cycling: carbon, phosphorus
Answer
A. 10% law
Explanation
10% law. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q3MCQ1 markEasy
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. Ecological succession if retained
B. Pyramids of number, biomass, energy
C. Every chapter ends with keywords or a summary that is useful for one-mark answers
D. Write three points from Ecosystem in your own words; that is enough for a short-answer start
Answer
B. Pyramids of number, biomass, energy
Explanation
Pyramids of number, biomass, energy. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q4MCQ1 markEasy
Choose the correct statement related to Nutrient cycling in the chapter Ecosystem.
A. Nutrient cycling: carbon, phosphorus
B. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
C. Use the terms used in the NCERT book; do not replace them with unofficial names
D. CBSE often tests a concept by asking a daily-life example from the same chapter
Answer
A. Nutrient cycling: carbon, phosphorus
Explanation
Nutrient cycling: carbon, phosphorus. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q5MCQ1 markModerateRevision pick
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. Mix MCQs with short answers so you remember both facts and explanations from Ecosystem
B. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
C. Ecological succession if retained
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
C. Ecological succession if retained
Explanation
Ecological succession if retained. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q6MCQ1 markEasy
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. Write three points from Ecosystem in your own words; that is enough for a short-answer start
B. Nutrient cycling: carbon, phosphorus
C. Every chapter ends with keywords or a summary that is useful for one-mark answers
D. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
Answer
D. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
Explanation
Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q7MCQ1 markEasy
Choose the correct statement related to Textbook first in the chapter Ecosystem.
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 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q8MCQ1 markEasy
Choose the correct statement related to Keywords in the chapter Ecosystem.
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 Ecosystem
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 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q9MCQ1 markEasyRevision pick
Choose the correct statement related to Examples in the chapter Ecosystem.
A. Write three points from Ecosystem in your own words; that is enough for a short-answer start
B. This idea is not part of the NCERT chapter
C. CBSE often tests a concept by asking a daily-life example from the same chapter
D. GPP, NPP
Answer
C. 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 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q10MCQ1 markModerate
Choose the correct statement related to Diagrams in the chapter Ecosystem.
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. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
D. 10% law
Answer
C. 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 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q11MCQ1 markEasy
Choose the correct statement related to Revision in the chapter Ecosystem.
A. Write three points from Ecosystem in your own words; that is enough for a short-answer start
B. Mix MCQs with short answers so you remember both facts and explanations from Ecosystem
C. Pyramids of number, biomass, energy
D. This happens only in a laboratory and never in daily life
Answer
A. Write three points from Ecosystem in your own words; that is enough for a short-answer start
Explanation
Write three points from Ecosystem 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 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q12MCQ1 markEasy
Choose the correct statement related to Accuracy in the chapter Ecosystem.
A. Nutrient cycling: carbon, phosphorus
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. GPP, NPP
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 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q13MCQ1 markEasyRevision pick
Choose the correct statement related to Practice in the chapter Ecosystem.
A. 10% law
B. Ecological succession if retained
C. The textbook says the opposite of this statement
D. Mix MCQs with short answers so you remember both facts and explanations from Ecosystem
Answer
D. Mix MCQs with short answers so you remember both facts and explanations from Ecosystem
Explanation
Mix MCQs with short answers so you remember both facts and explanations from Ecosystem. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q14MCQ1 markEasy
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
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. Nutrient cycling: carbon, phosphorus
D. GPP, NPP
Answer
D. GPP, NPP
Explanation
GPP, NPP. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q15MCQ1 markModerate
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. Ecological succession if retained
B. 10% law
C. Every chapter ends with keywords or a summary that is useful for one-mark answers
D. GPP, NPP
Answer
B. 10% law
Explanation
10% law. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q16MCQ1 markEasy
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. CBSE often tests a concept by asking a daily-life example from the same chapter
B. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
C. Pyramids of number, biomass, energy
D. 10% law
Answer
C. Pyramids of number, biomass, energy
Explanation
Pyramids of number, biomass, energy. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q17MCQ1 markEasyRevision pick
Choose the correct statement related to Nutrient cycling in the chapter Ecosystem.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
B. Pyramids of number, biomass, energy
C. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
D. Nutrient cycling: carbon, phosphorus
Answer
D. Nutrient cycling: carbon, phosphorus
Explanation
Nutrient cycling: carbon, phosphorus. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q18MCQ1 markEasy
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. Ecological succession if retained
B. Nutrient cycling: carbon, phosphorus
C. Every chapter ends with keywords or a summary that is useful for one-mark answers
D. Write three points from Ecosystem in your own words; that is enough for a short-answer start
Answer
A. Ecological succession if retained
Explanation
Ecological succession if retained. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q19MCQ1 markEasy
Choose the correct statement related to Ecosystem in the chapter Ecosystem.
A. 10% law
B. Ecological succession if retained
C. This topic is only for college
D. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
Answer
D. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
Explanation
Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology. The other options mix ideas from nearby topics or reverse the textbook fact.
Meta
Class: Class 12 · Subject: Biology · Chapter: Ecosystem · Original GKSchools practice (NCERT-aligned, not an official CBSE paper).
Q20MCQ1 markModerate
Choose the correct statement related to Textbook first in the chapter Ecosystem.
A. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
B. Ecosystem is an NCERT chapter taught in CBSE Class 12 Biology
C. Mix MCQs with short answers so you remember both facts and explanations from Ecosystem
D. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
Answer
A. 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 12 · Subject: Biology · Chapter: Ecosystem · 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-12/, then subject and chapter slugs.
Why is this a separate URL?
So students searching for “MCQ 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.
