Class 12 Biology — Chapter 6: Evolution

What you'll learn

• ▸Origin of Universe and Early Earth
• ▸Chemical Evolution and the Miller-Urey Experiment
• ▸Early Theories on the Origin of Life
• ▸Darwin's Theory of Natural Selection
• ▸Paleontological Evidence for Evolution
• ▸Comparative Anatomy: Homologous and Analogous Structures
• ▸Embryological Evidence for Evolution

Chapter Summary

--- PAGE 1 --- 12083CH07 CHAPTER 6 EVOLUTION 6.1 Origin of Life 6.2 Evolution of Life Forms - A Theory 6.3 What are the Evidences for Evolution? 6.4 What is Adaptive Radiation? 6.5 Biological Evolution 6.6 Mechanism of Evolution 6.7 Hardy - Weinberg Principle 6.8 A Brief Account of Evolution 6.9 Origin and Evolution of Man Evolutionary Biology is the study of history of life forms on earth. What exactly is evolution? To understand the changes in flora and fauna that have occurred over millions of years on earth, we must have an understanding of the context of origin of life, i.e., evolution of earth, of stars and indeed of the universe itself. What follows is the longest of all the construed and conjectured stories. This is the story of origin of life and evolution of life forms or biodiversity on planet earth in the context of evolution of earth and against the background of evolution of universe itself. 6.1 ORIGIN OF LIFE When we look at stars…

Practice Questions from this Chapter

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1. Describe Earth's early atmosphere? Get Solution →
2. Explain natural selection simply? Get Solution →
3. Trace the first life forms? Get Solution →
4. What is the study of the history of life forms on earth called? Get Solution →
5. According to the Big Bang theory, approximately how old is the universe? Get Solution →
6. Who experimentally demonstrated that life comes only from pre-existing life, disproving the theory of spontaneous generation? Get Solution →
7. In S.L. Miller's 1953 experiment, which gases were used to simulate the conditions of early earth? Get Solution →
8. Charles Darwin made his observations during a sea voyage on a ship named: Get Solution →

Did you know?

• 💡 The universe began as a tiny, super-hot dot before the Big Bang expansion.
• 💡 Amino acids, vital for life, were created in a lab simulating early Earth's harsh conditions.
• 💡 Some scientists believe that microscopic life forms might have traveled to Earth from space.
• 💡 Early Earth's atmosphere was poisonous to humans, full of gases like methane and ammonia.
• 💡 All life on Earth, from people to plants, shares a common ancestor from billions of years ago.

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