Central Board of Secondary Education
Practice Question Paper — not an official CBSE document
Subject Code 044 · Set 3 of 3
Theory 70 + practical 30. This page is the 70-mark theory practice paper.
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.
Objective type (MCQ and Assertion–Reason) · Q1–16 · 1 mark each · 16 marks
C. Latitudinal gradient
NoteLatitudinal gradient. The other options mix ideas from nearby topics or reverse the textbook fact.
D. lac operon
Notelac operon. The other options mix ideas from nearby topics or reverse the textbook fact.
D. Every chapter ends with keywords or a summary that is useful for one-mark answers
NoteEvery 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.
B. Write three points from Human Reproduction in your own words; that is enough for a short-answer start
NoteWrite three points from Human Reproduction 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.
C. Innate vs acquired immunity
NoteInnate vs acquired immunity. The other options mix ideas from nearby topics or reverse the textbook fact.
B. Nutrient cycling: carbon, phosphorus
NoteNutrient cycling: carbon, phosphorus. The other options mix ideas from nearby topics or reverse the textbook fact.
D. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions
NoteRead 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.
A. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures
NoteIf 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.
D. Mix MCQs with short answers so you remember both facts and explanations from Sexual Reproduction in Flowering Plants
NoteMix MCQs with short answers so you remember both facts and explanations from Sexual Reproduction in Flowering Plants. The other options mix ideas from nearby topics or reverse the textbook fact.
D. Homologous vs analogous
NoteHomologous vs analogous. The other options mix ideas from nearby topics or reverse the textbook fact.
D. Organisms and Populations is an NCERT chapter taught in CBSE Class 12 Biology
NoteOrganisms and Populations is an NCERT chapter taught in CBSE Class 12 Biology. The other options mix ideas from nearby topics or reverse the textbook fact.
D. CBSE often tests a concept by asking a daily-life example from the same chapter
NoteCBSE 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.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
A. Both A and R are true, and R is the correct explanation of A.
NoteRead Assertion and Reason separately first. Here both match the textbook idea, and R explains why A is taught in this chapter.
Very Short Answer · Q17–21 · 2 marks each · 10 marks
1. Write three points from Human Reproduction in your own words; that is enough for a short-answer start.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
1. Innate vs acquired immunity.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
1. Nutrient cycling: carbon, phosphorus.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
1. Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
1. If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures.
2. Keep the NCERT wording and add one daily-life example from the same chapter.
Two-mark answers work best as two numbered points. One definition plus one example is usually enough.
Short Answer · Q22–28 · 3 marks each · 21 marks
Mix MCQs with short answers so you remember both facts and explanations from Sexual Reproduction in Flowering Plants. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Homologous vs analogous. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Organisms and Populations is an NCERT chapter taught in CBSE Class 12 Biology. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
CBSE often tests a concept by asking a daily-life example from the same chapter. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
Use the terms used in the NCERT book; do not replace them with unofficial names. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
OR
Latitudinal gradient. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
OR — marking pointsEvery chapter ends with keywords or a summary that is useful for one-mark answers. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
OR
lac operon. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
NoteThree-mark questions want a short explanation, not a full essay. Link the idea to a figure or an activity.
OR — marking pointsWrite three points from Human Reproduction in your own words; that is enough for a short-answer start. Example: Use a situation from the NCERT activity or a labelled diagram in this chapter.
Case-study / source-based · Q29–30 · 4 marks each · 8 marks
(i) Keywords.
(ii) Every chapter ends with keywords or a summary that is useful for one-mark answers.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
(i) Revision.
(ii) Write three points from Human Reproduction in your own words; that is enough for a short-answer start.
(iii) Apply it in a school experiment, a labelled diagram, or a situation described in the NCERT chapter.
Case-based items recycle a short story. Pull the fact out first, then apply it. This is original practice in CBSE case style — not a copied board paper.
Long Answer · Q31–33 · 5 marks each · 15 marks
Human Health and Disease — Innate vs acquired immunity. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
NoteLong answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR
Nutrient cycling — Nutrient cycling: carbon, phosphorus. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
NoteLong answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR — marking pointsDiagrams — If the chapter has a diagram, practise labelling it — many school tests ask for labelled figures. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
OR
Textbook first — Read the definitions, diagrams and solved examples in the NCERT textbook before practising extra questions. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
NoteLong answers are marked for structure. Use headings or numbered steps so the examiner can see each part.
OR — marking pointsPractice — Mix MCQs with short answers so you remember both facts and explanations from Sexual Reproduction in Flowering Plants. Explain the idea in order (definition → working → result). End with one application from daily life or a numerical/diagram if the chapter has one.
*** End of paper ***
No. The layout (sections, question numbers, marks and time) follows the 2025-26 sample paper. The questions are original GKSchools practice.
MCQ, assertion–reason and reading MCQ parts are auto-scored when you submit. Written answers are for self-check against the key.
Download it from CBSE Academic: https://cbseacademic.nic.in/web_material/SQP/ClassXII_2025_26/Biology-SQP.pdf
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