Evolution — Class 12 Biology NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 12 Biology chapter "Evolution" — 5 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 12 Biology chapter "Evolution" — 5 important questions with detailed answers for CBSE board exam preparati…
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Key Questions Covered:
- Define evolution. Explain the evidence for evolution from paleontology, compa…
- State and explain Darwin's theory of natural selection with examples.
- Define speciation. Explain different modes of speciation with examples.
- + 2 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define evolution. Explain the evidence for evolution from… | ✓ Solved |
| State and explain Darwin's theory of natural selection wi… | ✓ Solved |
| Define speciation. Explain different modes of speciation … | ✓ Solved |
Showing 3 of 5 questions
Q1: Define evolution. Explain the evidence for evolution from paleontology, comparative anatomy, and molecular biology.
Evolution: Change in heritable characteristics of populations over successive generations. Gradual modification of organisms over time resulting in formation of new species. Based on descent with modification from common ancestors.
Evidence for evolution:
1. Paleontological evidence (Fossil record...
Q2: State and explain Darwin's theory of natural selection with examples.
Charles Darwin's theory of natural selection (1859) explains mechanism of evolution.
Key observations:
1. Variation: Individuals in population show variation in traits
- Example: some beetles dark, some light colored
- Variation heritable and passed to offspring
2. Overproduction: Organisms...
Q3: Define speciation. Explain different modes of speciation with examples.
Speciation: Process of evolution of new species from existing species. Formation of reproductive isolation preventing gene flow between populations. Results in separate species that cannot interbreed.
Species concept (Biological definition):
- Groups of actually or potentially interbreeding wild po...
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