RBSE Class 12 Biology One Shot Revision Notes 2026 | RBSE 12वीं जीव विज्ञान फटाफट रिवीजन नोट्स

📅 Monday, 12 January 2026 📖 3-5 min read
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RBSE Class 12 Biology – One Shot Revision Notes 2026 (Part 1)

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RBSE Class 12 Biology – One Shot Revision Notes 2026 (Ultra-Condensed | High-Yield)

यह One Shot Revision Notes सीरीज़ NCERT-based है और last-minute revision के लिए डिज़ाइन की गई है। हर unit के केवल high-yield points, definitions, keywords और diagrams cues शामिल हैं ताकि कम समय में अधिक coverage हो सके।

Use With:

📌 UNIT 1 – REPRODUCTION (ONE SHOT)

Sexual Reproduction in Flowering Plants
  • Double fertilisation: Syngamy + Triple fusion
  • Embryo sac: 7-celled, 8-nucleate
  • Pollination ≠ Fertilisation
  • Diagram cue: Flower L.S., embryo sac
Human Reproduction
  • Menstrual cycle: 28 days (FSH → LH surge → Ovulation)
  • Spermatogenesis starts at puberty
  • Diagram cue: Female reproductive system
Reproductive Health
  • Barrier, IUD, Hormonal, Surgical methods
  • STDs: AIDS (HIV), Syphilis, Gonorrhoea

📌 UNIT 2 – GENETICS & EVOLUTION (ONE SHOT)

Principles of Inheritance
  • Monohybrid ratio: 3:1 (Phenotype)
  • Dihybrid ratio: 9:3:3:1
  • Incomplete dominance ≠ Codominance
  • Diagram cue: Punnett square
Molecular Basis of Inheritance
  • DNA: Double helix, antiparallel, H-bonds
  • Replication: Semi-conservative (Meselson–Stahl)
  • Central dogma: DNA → RNA → Protein
  • Diagram cue: DNA double helix
Evolution
  • Homologous organs → divergent evolution
  • Analogous organs → convergent evolution
  • Human evolution sequence (chronological)
Speed Tip:
• One unit = 20–25 minutes revision
• Keywords underline करें
• Diagram cues याद रखें

📘 More RBSE Class 12 Biology Support

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RBSE Class 12 Biology – One Shot Revision Notes 2026 (Part 2)

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RBSE Class 12 Biology – One Shot Revision Notes 2026 (Biotechnology, Human Welfare & Ecology)

यह One Shot Revision Notes का दूसरा भाग है, जिसमें Biotechnology, Biology in Human Welfare और Ecology & Environment से जुड़े सबसे महत्वपूर्ण NCERT-based points ultra-condensed रूप में दिए गए हैं।

Use With:

📌 UNIT 3 – BIOLOGY IN HUMAN WELFARE (ONE SHOT)

Human Health & Disease
  • Immunity: Innate + Acquired
  • Active vs Passive immunity
  • AIDS: Caused by HIV, attacks helper T-cells
  • Vaccination → Immunological memory
  • Diagram cue: HIV structure
Microbes in Human Welfare
  • Lactic acid bacteria → Curd
  • Yeast → Alcohol
  • Antibiotic: Penicillin (Alexander Fleming)
  • Sewage treatment → Activated sludge process
  • Diagram cue: Biogas plant

📌 UNIT 4 – BIOTECHNOLOGY (ONE SHOT)

Biotechnology – Principles & Processes
  • Restriction enzymes cut DNA at specific sites
  • Vectors: Plasmids, Bacteriophages
  • Selectable marker → Antibiotic resistance gene
  • PCR steps: Denaturation → Annealing → Extension
  • Diagram cue: rDNA steps, PCR cycle
Biotechnology – Applications
  • Insulin production using E. coli
  • Gene therapy → ADA deficiency
  • GM crops: Bt cotton (Cry protein)

📌 UNIT 5 – ECOLOGY & ENVIRONMENT (ONE SHOT)

Environmental Issues
  • Greenhouse gases: CO₂, CH₄, N₂O
  • Global warming → Climate change
  • Ozone depletion → UV radiation increase
  • Solid waste management → 3R (Reduce, Reuse, Recycle)
  • Diagram cue: Greenhouse effect

⚡ ULTRA-FAST REVISION CHECKLIST

  • Definitions = NCERT language
  • Flow charts > paragraphs
  • Diagrams = pencil + ruler
  • Keywords underline करें
One Shot Rule:
• 3–4 घंटे में पूरा syllabus revise संभव
• Diagrams cues याद रखें
• Repeated questions पहले देखें

📘 More RBSE Class 12 Biology Support

© ncertclasses.com | RBSE Class 12 Biology – One Shot Revision Notes 2026

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RBSE Class 12 Biology – One Shot Revision Notes 2026 (Final)

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Marwari Mission 100

RBSE Class 12 Biology – One Shot Revision Notes 2026 (Final Rapid Revision & Exam-Day Strategy)

यह One Shot Revision Notes का अंतिम भाग है, जो exam से ठीक पहले के लिए डिज़ाइन किया गया है। यहाँ ultra-fast revision checklist, exam-day strategy और maximum scoring rules दिए गए हैं, ताकि कम समय में अधिकतम output मिल सके।

Final Revision Must-Use:

⚡ 90-MINUTE ULTRA-FAST REVISION PLAN

First 30 Minutes
  • Top diagrams quick recall (Flower, DNA, Biogas)
  • Genetics ratios & definitions
Next 30 Minutes
  • Reproduction flow charts
  • Biotechnology steps (rDNA, PCR)
Last 30 Minutes
  • Environment keywords
  • Health & disease definitions

🎯 MAXIMUM SCORING RULES (RBSE CHECKING)

  • Answers point-wise + headings
  • NCERT keywords underline करें
  • Diagrams compulsory जहाँ possible हों
  • Flow charts = extra impression

🧪 MOST FORGOTTEN BUT IMPORTANT POINTS

  • Embryo sac = 7-celled, 8-nucleate
  • Replication = semi-conservative
  • PCR temperature values
  • Greenhouse gases list

📝 EXAM-DAY CHECKLIST

  • Question paper reading – 15 minutes
  • Strongest section first attempt करें
  • Diagrams pencil से, ruler के साथ
  • Last 10 minutes revision

⚠️ LAST-MINUTE MISTAKES TO AVOID

  • New topics start करना
  • Overwriting / cutting
  • Guess-based answers
Final Formula:
Clear Concepts + Clean Presentation + Smart Time Use = High Score

📘 Complete RBSE Class 12 Biology System

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