RBSE Class 12 Biology Sample Question Paper 2026 with Solutions | RBSE 12वीं जीव विज्ञान मॉडल पेपर

📅 Monday, 12 January 2026 📖 3-5 min read
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RBSE Class 12 Biology – Sample Question Paper 2026 (With Solutions)

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RBSE Class 12 Biology Sample Question Paper 2026 (With Solutions | Latest Exam Pattern)

यह लेख RBSE Class 12 Biology Sample Question Paper 2026 प्रस्तुत करता है, जो नवीनतम RBSE परीक्षा पैटर्न के अनुसार तैयार किया गया है। यह मॉडल पेपर MCQs, Very Short, Short, Long Answer तथा Competency / Case Study based questions को कवर करता है। इसका उद्देश्य विद्यार्थियों को actual board exam जैसी practice देना है।

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📄 GENERAL INSTRUCTIONS

  • All questions are compulsory.
  • The question paper consists of 5 Sections A, B, C, D and E.
  • Use of calculator is not permitted.
  • Diagrams should be neat and properly labelled.

🟢 SECTION A – MCQs (1 × 10 = 10 Marks)

  1. Double fertilisation occurs in:
    • (a) Bryophytes
    • (b) Pteridophytes
    • (c) Gymnosperms
    • (d) Angiosperms
  2. The correct sequence of human evolution is:
    • (a) Homo erectus → Homo habilis → Homo sapiens
    • (b) Homo habilis → Homo erectus → Homo sapiens
    • (c) Australopithecus → Homo sapiens → Homo erectus
    • (d) Dryopithecus → Homo sapiens → Homo erectus
  3. Okazaki fragments are formed on:
    • (a) Leading strand
    • (b) Lagging strand
    • (c) Both strands
    • (d) RNA strand
  4. Which enzyme is used to cut DNA at specific sites?
    • (a) DNA ligase
    • (b) DNA polymerase
    • (c) Restriction endonuclease
    • (d) RNA polymerase
  5. AIDS is caused by:
    • (a) Bacteria
    • (b) Protozoa
    • (c) Virus
    • (d) Fungus

🟡 SECTION B – Very Short Answer (2 × 5 = 10 Marks)

  1. What is pollination?
  2. Define homologous organs.
  3. Name the causative agent of malaria.
  4. What is plasmid?
  5. Write one use of PCR technique.
Practice Tip:
• इस sample paper को समय सीमा में solve करें
• पहले MCQs और short answers attempt करें
• Solutions देखने से पहले self-evaluation करें

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RBSE Class 12 Biology – Sample Question Paper 2026 (Part 2)

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RBSE Class 12 Biology Sample Question Paper 2026 (Short Answer, Long Answer & Diagram Section)

यह Article 29 का दूसरा भाग है, जिसमें Short Answer, Long Answer तथा Diagram-based questions शामिल हैं। ये प्रश्न RBSE बोर्ड के नवीनतम पैटर्न के अनुसार concept clarity, presentation और diagram labelling को जाँचते हैं।

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🟠 SECTION C – Short Answer Questions (3 × 5 = 15 Marks)

  1. Explain the process of double fertilisation in flowering plants.
  2. Differentiate between homologous and analogous organs (any three points).
  3. Describe the structure of DNA.
  4. Explain the role of microbes in sewage treatment.
  5. Write any three applications of biotechnology.

🔵 SECTION D – Long Answer Questions (5 × 4 = 20 Marks)

  1. Describe Mendel’s laws of inheritance with suitable examples.
  2. Explain DNA replication with the help of a labelled diagram.
  3. Describe the life cycle of Plasmodium with a neat diagram.
  4. Explain recombinant DNA technology and its applications.

🟣 SECTION E – Diagram Based Questions (5 × 1 = 5 Marks)

Draw neat and labelled diagrams of the following:

  1. L.S. of Flower
  2. Human female reproductive system
  3. DNA double helix
  4. Monohybrid cross (Punnett square)
  5. Biogas plant
Answer Writing Tip:
• Short answers में keywords underline करें
• Long answers में headings + diagram का प्रयोग करें
• Diagram हमेशा pencil से साफ-सुथरा बनाएं

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RBSE Class 12 Biology – Sample Question Paper 2026 (Solutions)

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RBSE Class 12 Biology Sample Question Paper 2026 (Complete Solutions, Answer Key & Time Strategy)

यह Article 29 का अंतिम भाग है, जिसमें Section A से Section E तक के model answers / solutions दिए गए हैं। साथ ही time management strategy भी दी गई है, ताकि विद्यार्थी वास्तविक बोर्ड परीक्षा में paper को सही समय में पूरा कर सकें।

Important Biology Resources:

✅ SECTION A – MCQs (Answer Key)

  1. (d) Angiosperms
  2. (b) Homo habilis → Homo erectus → Homo sapiens
  3. (b) Lagging strand
  4. (c) Restriction endonuclease
  5. (c) Virus

✅ SECTION B – Very Short Answers

  1. Pollination: Transfer of pollen grains from anther to stigma of the same or different flower.
  2. Homologous organs: Organs with same origin but different functions.
  3. Causative agent of malaria: Plasmodium.
  4. Plasmid: Small circular extrachromosomal DNA found in bacteria.
  5. One use of PCR: Amplification of DNA segments.

✅ SECTION C – Short Answer (Hints)

  • Double fertilisation: Syngamy + Triple fusion (3–4 points).
  • Homologous vs Analogous: Origin, structure, function (any three).
  • DNA structure: Double helix, antiparallel strands, base pairing.
  • Sewage treatment: Role of microbes in reducing BOD.
  • Biotechnology applications: Insulin, vaccines, GM crops.

✅ SECTION D – Long Answer (Key Points)

  • Mendel’s laws: Dominance, Segregation, Independent assortment with examples.
  • DNA replication: Semi-conservative, leading & lagging strands, enzymes.
  • Plasmodium life cycle: Human host + mosquito host with diagram.
  • rDNA technology: Isolation → Restriction → Ligation → Transformation → Expression.

✅ SECTION E – Diagram Answers

  • L.S. of Flower – All major parts labelled
  • Female reproductive system – Ovary, oviduct, uterus
  • DNA double helix – Sugar-phosphate backbone, base pairs
  • Monohybrid cross – Punnett square with ratios
  • Biogas plant – Digester, gas holder, outlet

⏱️ TIME MANAGEMENT STRATEGY (3 HOURS)

Section Recommended Time
Reading Question Paper 15 minutes
MCQs + Very Short 30 minutes
Short Answer 40 minutes
Long Answer 60 minutes
Diagrams & Revision 20–25 minutes
Final Exam Advice:
• Sample paper को 2–3 बार timed practice करें
• Diagrams को neat और labelled रखें
• Last 10 minutes में पूरा paper revise करें

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