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Revision Notes
Evolution — Revision Notes
ICSE · Class 10 · Biology
Evolution revision notes for ICSE Class 10 Biology: 4 topics in quick points. Key terms: Organic evolution is the slow, Jean and According to Lamarck.
41 questions32 flashcards5 concepts
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1. Basic idea of evolution
- Organic evolution means slow and gradual change in living organisms over many generations.
- Living organisms on earth have developed as a result of descent with modifications from a common ancestor.
- More complex forms evolved from earlier simpler forms.
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2. Lamarckism
- Jean-Baptiste Lamarck was the first French biologist to attempt explaining evolution.
- He published his views in Philosophie Zoologique in 1809.
- His theory is called the Theory of Inheritance of Acquired Characters or the Theory of Use and Disuse.
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3. Example of Lamarckism: Long neck of giraffe
- According to Lamarck, ancestors of present-day giraffes were goat-sized.
- When grass disappeared from the ground, they stretched their neck and forelimbs to reach leaves on trees.
- The constant stretching continued for many generations.
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4. Vestigial organs
- Vestigial organs are non-functional in present-day organisms but were functional in ancestors.
- Important vestigial organs in humans are vermiform appendix, wisdom tooth, muscles of ear pinna, and coccyx.
- The vermiform appendix is a blind tube-like structure connected to the caecum.
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Full NotesKey Concepts
Organic evolution is the slowJeanAccording to LamarckVestigial organs are nonWeismann doubted inheritance of acquired characters
Frequently Asked Questions
What are the important topics in Evolution for ICSE Class 10 Biology?
Key topics in Evolution include Basic idea of evolution, Lamarckism, Example of Lamarckism: Long neck of giraffe, Vestigial organs. Study these first, then practise questions on each for the ICSE Class 10 board exam.
How should I revise Evolution for the ICSE Class 10 board exam?
Learn the core ideas first, then work through the 41 practice questions on Evolution. Revise definitions regularly and use flashcards for quick recall before the exam.
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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