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Concept Maps

Origin of life — Concept Maps

ICSE · Class 12 · Biology

4 concept maps of Origin of life for ICSE Class 12 Biology, each also written out as a text outline. Part of the ICSE Class 12 Biology syllabus.

103 questions34 flashcards5 concepts

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4 Concept Maps

Timeline of Major Events in Origin of Life

Timeline of Major Events in Origin of Life

The map in words

  • 4500 Mya
    • Earth formed from nebula
  • 4000 Mya
    • Primitive reducing atmosphere
  • 3700 Mya
    • First life forms in ocean
  • 3500 Mya
    • First prokaryotes formed
  • 2700 Mya
    • Blue-green algae release oxygen
  • 2700 Mya
    • Oxygen revolution begins
  • 1500 Mya
    • Eukaryotic cells appear
  • 600 Mya
    • Multicellular life evolves
  • 400 Mya
    • Life colonizes land

Oparin-Haldane Eight-Step Process of Life's Origin

Oparin-Haldane Eight-Step Process of Life's Origin

The map in words

  • Earth Formation
    • Primitive Atmosphere Reducing atmosphere No free O2
      • Simple Inorganic Compounds Form Oxides, carbides, nitrides
        • Organic Molecules Synthesis Amino acids, sugars, bases
          • Complex Macromolecules Proteins, nucleic acids Nucleoproteins
            • Coacervates & Protobionts First cell-like structures
              • Autocatalytic Systems Self-replicating nucleoproteins
                • Prokaryotic Cells First living organisms Anaerobic heterotrophs
                  • Autotrophy Evolution Chemoautotrophy then Photoautotrophy
                    • Photosynthesis & Oxygen Release Atmosphere changes
                      • Aerobic Respiration Evolution More energy available
                        • Eukaryotic Cells Complex life forms Multicellular organisms

Mind map showing the hierarchical structure of universe formation from Big Bang through solar system development and planetary conditions.

Mind map showing the hierarchical structure of universe formation from Big Bang through solar system development and planetary conditions.

The map in words

  • Universe and Solar System
    • Big Bang Theory
      • 10-20 billion years ago
      • Massive explosion
      • Expansion and cooling
    • Galaxy Formation
      • Hydrogen and helium
      • Gravitational condensation
      • 100 billion+ galaxies
    • Our Solar System
      • Milky Way galaxy
      • Formed 4.5 billion years ago
      • Nebula condensation
      • Sun and eight planets
    • Planet Conditions
      • Mercury: Too hot
      • Venus: Extreme heat and pressure
      • Earth: Goldilocks zone
      • Mars: Lost atmosphere

Origin of life on Earth as a gradual biochemical and evolutionary process

Origin of life on Earth as a gradual biochemical and evolutionary process

The map in words

  • Origin of life on Earth as a gradual biochemical and evolutionary process
    • Universe and solar system
    • Theory of special creation
    • Theory of spontaneous generation
    • Theory of biogenesis
    • Oparin-Haldane theory
    • Primitive Earth conditions
    • Abiotic synthesis of organic compounds
    • Miller-Urey experiment

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Frequently Asked Questions

What are the important topics in Origin of life for ICSE Class 12 Biology?
Key topics in Origin of life include Universe, Earth, and the setting for life, Early ideas about origin of life, Experimental proof of biogenesis, Modern biochemical origin of life: Oparin-Haldane theory. Study these first, then practise questions on each for the ICSE Class 12 board exam.
What do the concept maps for Origin of life show?
The 4 maps show how the ideas in Origin of life connect: Timeline of Major Events in Origin of Life; Oparin-Haldane Eight-Step Process of Life's Origin. Each map is also written out as an outline on this page.
How should I revise Origin of life for the ICSE Class 12 board exam?
Learn the core ideas first, then work through the 103 practice questions on Origin of life. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 12 Biology Concept Maps

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