Evolution
ICSE · Class 10 · Biology
Complete topic list for Evolution in ICSE Class 10 Biology. Key concepts, sub-topics, and what to focus on for board exams.
Topics in Evolution
Basic Concepts of Evolution
- Evolution is the slow and gradual change in organisms over hundreds or thousands of years
- All living organisms have developed from common ancestors through descent with modifications
- Evolution follows a pattern: unicellular organisms appeared first, followed by multicellular organisms
Lamarck's Theory of Inheritance of Acquired Characters
- Proposed by Jean-Baptiste Lamarck in 1809 in his book 'Philosophie Zoologique'
- Also known as Theory of Use and Disuse
- Four main postulates: tendency to grow, formation of new organs, effect of use/disuse, inheritance of acquired characters
Vestigial Organs
- Organs that are non-functional in present organisms but were functional in ancestors
- Support Lamarck's theory of use and disuse
- Human examples: vermiform appendix, coccyx (tail bone), wisdom teeth, ear muscles
Darwin's Theory of Natural Selection
- Proposed by Charles Darwin in 'The Origin of Species' (1859)
- Seven main postulates: overproduction, constant populations, struggle for existence, variations, survival of fittest, natural selection, origin of species
- Organisms produce more offspring than can survive due to limited resources
Key Concepts
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What are the important topics in Evolution for ICSE Class 10 Biology?
Evolution covers several key topics that are frequently asked in ICSE Class 10 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Evolution — ICSE Class 10 Biology?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
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