Advanced Study Material for Class 12 Biology: Chapter 06 Evolution
Access comprehensive study materials and useful resources for Chapter 06 Evolution using the CBSE Class 12 Biology Evolution Key Points. Designed to align with the 2026-27 CBSE academic guidelines, these advanced resources help Class 12 Biology students reinforce core concepts beyond standard textbooks.
Practice Class 12 Biology Resources: Chapter 06 Evolution
Access the complete useful resource PDF for Class 12 Biology below. Regular practice with these targeted academic notes builds familiarity with complex topics and helps secure higher marks in final school evaluations.
CBSE Class 12 Biology Evolution Key Points. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.
Class 12 Biology Chapter 7 Evolution key points for CBSE board exam revision. This page gives the meaning of important evolution terms such as homologous and analogous organs, divergent and convergent evolution, adaptive radiation, fossils, speciation, genetic drift and gene flow, together with the theories of the origin of life.
Chapter 7 Evolution (Key Points)
| No. | Term | Meaning |
|---|---|---|
| 1 | Homologous | Organs with similar origin and structure (SOS) but differ in appearance and function (DAF). Eg. Forelimbs of whale, bats, cheetah, horse |
| 2 | Divergent evolution | Due to different needs, some structures developed differently |
| 3 | Analogous | Organs with similar appearance and function (SAF) but differ in origin and structure (DOS). Eg. Wings of butterfly and bat |
| 4 | Convergent evolution | Organs or species with different origin and structure acquire similar appearance and function because they live in similar habitats or have similar needs (analogous organs) |
| 5 | Biogenesis | Life originates from pre-existing life |
| 6 | Adaptive radiation | Evolution starting from a single point and radiating in different directions |
| 7 | Fossil | Preserved remains or imprints of plants and animals that lived millions of years ago |
| 8 | Palaeontology | Systemic and scientific study of fossils |
| 9 | Saltation | Biological term for single step large mutation in a single leap or saltus |
| 10 | Speciation | Process of evolving or formation of new species from the existing one |
| 11 | Differential reproduction | Different reproductive rate for the different individuals in a population |
| 12 | Biogeography | Study of distribution of various organisms from different parts of the earth |
| 13 | Founder effect | Changes in the allele frequencies in a new population due to migration of members |
| 14 | Genetic drift | Changes occurring in gene frequencies by chance |
| 15 | Gene flow or gene migration | When individuals migrate to another place or population, new genes or alleles are added to the new population and are lost from the old population in turn, changing the frequencies when gene migration occurs many a times |
| 16 | Stabilization | Large number of individuals acquire mean character value |
| 17 | Directional change | Large number of individuals acquire value other than mean value |
| 18 | Distribution | Large number of individuals acquire peripheral character value at both ends of the distribution curve |
Origin of Life
| Scientist | Year | Theory/Experiment | Conclusion |
|---|---|---|---|
| Lemaitre | 1927 | Big Bang theory | The universe expanded from explosion of a primordial, hot substance |
| Oparin and Haldane | 1924 to 1929 | Chemical evolution preceded organic evolution | Simple organic molecules originated from inorganic precursors |
| Stanley Miller and Urey | 1952 | Synthesis of biomolecules by creation of similar conditions as primitive atmosphere on laboratory scale | Amino acids were synthesized from ammonia, methane and carbon dioxide inside specialized apparatus |
Free study material for Biology
Biology Class 12 Exam Resources: Chapter 06 Evolution
Core Study Kit: Class 12 Biology Chapter 06 Evolution
Access comprehensive study material for Chapter 06 Evolution, including revision notes, concept maps, and high-probability questions. These resources are designed in alignment with the latest 2026 CBSE syllabus for Class 12 Biology to support effective exam preparation.
NCERT-Aligned Solutions for Chapter 06 Evolution
Built using official NCERT guidelines for Class 12 Biology, these materials provide reliable academic support. Integrating past examination questions and step-by-step solutions helps students understand official CBSE grading criteria.
Next Steps in Your Exam Preparation
For peak performance in upcoming evaluations, integrate official Biology sample papers directly into your study schedule. Follow up your revision by attempting online MCQ tests for Chapter 06 Evolution to refine calculation speed and precision.
FAQs
Our advanced study package for Chapter 06 Evolution includes detailed concepts, diagrams, Mind Maps, and explanation of complex topics to ensure Class 12 students learn as per syllabus for 2026 exams.
The Mind Maps provided for Chapter 06 Evolution act as visual anchors which will help faster recall during high-pressure exams.
Yes, teachers use our Class 12 Biology resources for lesson planning as they are in simple language and have lot of solved examples.
Yes, You can download the complete, mobile-friendly PDF of the Biology Chapter 06 Evolution advanced resources for free.
Yes, our subject matter experts have updated the Chapter 06 Evolution material to align with the rationalized NCERT textbooks and have removed deleted topics and added new competency-based questions.