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Revision Notes

History of Life on Earth

NIOS · Class 10 · Science & Tech

Quick revision notes for History of Life on Earth — NIOS Class 10 Science & Tech. Key concepts, formulas, and definitions for last-minute revision.

44 questions38 flashcards5 concepts

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A comparison illustration showing the peppered moth (Biston betularia) in two scenarios: before industrialization (light moths camouflaged on lichen-covered trees, dark moths visible) and after indust
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Key Topics to Revise

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1. Origin of the Universe and Earth

  • The whole universe formed probably 12 to 14 billion years ago because of a Big Bang.
  • The solar system came into existence 5-7 GY ago.
  • Earth formed about 4.5 GY ago.
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2. Origin of Life

  • Life on Earth is generally believed to have originated not before 4.0 GY and not later than 3.5 GY ago.
  • Life is accepted to have originated nearly 3.8 GY ago.
  • Cyanobacteria fossils dated 3.5 GY were found in Australia.
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3. Diversification of Life

  • Life on Earth started as simplest unicellular prokaryotic microorganisms.
  • For nearly 3 billion years, prokaryotes were the only life forms on Earth.
  • Prokaryotes are cells lacking a nucleus.
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4. Darwin and Natural Selection

  • Charles Darwin was a British naturalist who proposed the theory of evolution by natural selection.
  • Darwin was born in Shrewsbury, England on February 9, 1809.
  • He sailed on HMS Beagle from 1831 to 1836.

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Key Concepts

The universe formed about 12Early Earth was extremely hotLife is believed to have originatedJStanley Miller and Harold Urey produced

Frequently Asked Questions

What are the important topics in History of Life on Earth for NIOS Class 10 Science & Tech?
Key topics in History of Life on Earth include Major Events in Earth's History, History of Life on Earth - Complete Overview, History of Life on Earth Timeline. These are the concepts NIOS Class 10 examiners draw on most — study them first, then practise related questions.
How to score full marks in History of Life on Earth — NIOS Class 10 Science & Tech?
Understand the core concepts first, then work through the 44 practice questions available for this chapter. Revise formulas and 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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