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Origin and Evolution of Life

Maharashtra Board · Class 12 · Biology

Quick revision notes for Origin and Evolution of Life — Maharashtra Board Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

43 questions28 flashcards5 concepts

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Key Topics to Revise

1

Origin of Life (Protobiogenesis)

  • Living matter shows attributes: responsiveness, growth, metabolism, energy transformations, and reproduction
  • Theory of Special Creation: Based on religious belief, states all organisms created by supernatural power (no scientific proof)
  • Cosmozoic Theory/Panspermia: Life descended from other planets as spores/microorganisms (doesn't explain origin on other planets)
2

Chemical Evolution of Life

  • Oparin (1924) and Haldane (1929) proposed chemical evolution theory
  • Big Bang Theory (Georges Lemaitre 1931): Universe originated 20 billion years ago
  • Earth formed 4.6 billion years ago from hot gases and cosmic dust (Nebula)
3

Organic Evolution and Darwinism

  • Evolution: Descent with modification (Darwin), slow gradual changes leading to new forms
  • Lamarck's Theory: Inheritance of acquired characters (disproved by Weismann's rat tail experiment)
  • Weismann's Germplasm Theory: Only germinal variations inherited, not somatic
4

Modern Synthetic Theory of Evolution

  • Contributors: Fischer, Haldane, Dobzhansky, Huxley, Mayr, Simpson, Stebbins
  • Key factors: Gene mutations, chromosomal changes, genetic recombination, natural selection, isolation
  • Population genetics concepts: Gene pool, gene frequency, Mendelian population

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Full Notes

Key Concepts

Four major theories explain life's originLife originated through a seriesThis hypothesis suggests that early lifeDarwin's theory is based on fiveThis theory integrates genetics with evolution

Frequently Asked Questions

What are the important topics in Origin and Evolution of Life for Maharashtra Board Class 12 Biology?
Origin and Evolution of Life covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Origin and Evolution of Life — Maharashtra Board Class 12 Biology?
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Sources & Official References

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

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