Class 12 Biology
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Tamil Nadu State Board
Textbook exercise solutions, MCQ, short & long answers — all chapters
CBSE
Chapter notes, NCERT solutions, and exam preparation guides
TN Board — Study Guides
Tamil Nadu Class 12 Biology: Bio Botany - Asexual and Sexual Reproduction in Plants
Samacheer Kalvi Class 12 Biology Bio Botany - Asexual and Sexual Reproduction in Plants guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Chromosomal Basis of Inheritance
Samacheer Kalvi Class 12 Biology Bio Botany - Chromosomal Basis of Inheritance guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Classical Genetics
Samacheer Kalvi Class 12 Biology Bio Botany - Classical Genetics guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Economically Useful Plants and Entrepreneurial Botany
Samacheer Kalvi Class 12 Biology Bio Botany - Economically Useful Plants and Entrepreneurial Botany guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Ecosystem
Samacheer Kalvi Class 12 Biology Bio Botany - Ecosystem guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Environmental Issues
Samacheer Kalvi Class 12 Biology Bio Botany - Environmental Issues guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Plant Breeding
Samacheer Kalvi Class 12 Biology Bio Botany - Plant Breeding guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Plant Tissue Culture
Samacheer Kalvi Class 12 Biology Bio Botany - Plant Tissue Culture guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Principles and Processes of Biotechnology
Samacheer Kalvi Class 12 Biology Bio Botany - Principles and Processes of Biotechnology guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Botany - Principles of Ecology
Samacheer Kalvi Class 12 Biology Bio Botany - Principles of Ecology guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Zoology - Applications of Biotechnology
Samacheer Kalvi Class 12 Biology Bio Zoology - Applications of Biotechnology guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Zoology - Biodiversity and Its Conservation
Samacheer Kalvi Class 12 Biology Bio Zoology - Biodiversity and Its Conservation guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology: Bio Zoology - Environmental Issues
Samacheer Kalvi Class 12 Biology Bio Zoology - Environmental Issues guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology Evolution Notes — Samacheer Kalvi
Complete Bio Zoology notes on Evolution for Tamil Nadu Class 12 Biology with evidence, Darwinism, natural selection, Hardy-Weinberg principle, and exam questions.
Tamil Nadu Class 12 Biology: Bio Zoology - Human Health and Diseases
Samacheer Kalvi Class 12 Biology Bio Zoology - Human Health and Diseases guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology Human Reproduction Notes — Samacheer Kalvi
Complete Bio Zoology notes on Human Reproduction for Tamil Nadu Class 12 Biology with male and female systems, gametogenesis, menstrual cycle, fertilisation, and exam questions.
Tamil Nadu Class 12 Biology: Bio Zoology - Microbes in Human Welfare
Samacheer Kalvi Class 12 Biology Bio Zoology - Microbes in Human Welfare guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology Molecular Genetics Notes — Samacheer Kalvi
Complete Bio Zoology notes on Molecular Genetics for Tamil Nadu Class 12 Biology with DNA structure, replication, transcription, translation, genetic code, and exam questions.
Tamil Nadu Class 12 Biology: Bio Zoology - Organisms and Populations
Samacheer Kalvi Class 12 Biology Bio Zoology - Organisms and Populations guide with summary, textbook workflow, important questions, practice tasks, common mistakes, and revision checklist.
Tamil Nadu Class 12 Biology Inheritance and Variation Notes — Samacheer Kalvi
Complete Bio Zoology notes on Principles of Inheritance and Variation for Tamil Nadu Class 12 Biology with Mendel laws, crosses, sex determination, pedigree basics, and exam questions.
Tamil Nadu Class 12 Biology Reproduction in Organisms Notes — Samacheer Kalvi
Complete Bio Zoology notes on Reproduction in Organisms for Tamil Nadu Class 12 Biology with asexual and sexual reproduction, life cycles, comparisons, and exam questions.
Tamil Nadu Class 12 Biology Reproductive Health Notes — Samacheer Kalvi
Complete Bio Zoology notes on Reproductive Health for Tamil Nadu Class 12 Biology with contraception, STIs, infertility, ART, awareness, and exam questions.
Tamil Nadu Class 12 Biology — Genetics and Heredity Notes & Important Questions
Complete Samacheer Kalvi Class 12 Biology Genetics guide — Mendel's laws, monohybrid and dihybrid crosses, codominance, linkage, mutations, and board exam Q&A.
Tamil Nadu Class 12 Biology — Molecular Biology and DNA Notes
Samacheer Kalvi Class 12 Biology DNA structure, Watson-Crick model, DNA replication, transcription, translation, genetic code, lac operon — board exam and NEET guide.
Tamil Nadu Class 12 Biology — Plant Physiology Notes & Important Questions
Complete Samacheer Kalvi Class 12 Biology Plant Physiology guide — photosynthesis light and dark reactions, C3 C4 CAM plants, plant respiration, transpiration, phytohormones, board exam Q&A.
Tamil Nadu Class 12 Biology — Human Reproduction Notes & Important Questions
Complete Samacheer Kalvi Class 12 Biology Human Reproduction guide — male and female reproductive systems, menstrual cycle, gametogenesis, fertilisation, embryonic development, board exam Q&A.
Tamil Nadu Class 12 Biology 30-Day Revision Plan — Samacheer Kalvi
Class 12 Biology 30-day revision plan for Tamil Nadu State Board students with weekly revision cycles, term-wise planning, model-paper practice, and mistake correction.
Tamil Nadu Class 12 Biology Complete Guide — Samacheer Kalvi
Class 12 Biology complete guide for Tamil Nadu State Board students with syllabus map, chapter list, textbook-solutions workflow, important questions, model-paper plan, revision plan, and FAQs.
Tamil Nadu Class 12 Biology Biology Diagram Bank — Samacheer Kalvi
Class 12 Biology biology diagram bank for Tamil Nadu State Board students with labelled diagrams, parts, functions, and neat presentation practice.
Tamil Nadu Class 12 Biology Biology Key Terms Bank — Samacheer Kalvi
Class 12 Biology biology key terms bank for Tamil Nadu State Board students with botany and zoology definitions, differences, and process keywords.
Tamil Nadu Class 12 Biology Model Paper 1 — Samacheer Kalvi
Class 12 Biology model paper 1 for Tamil Nadu State Board students with term-wise sections, written answer practice, and time management.
Tamil Nadu Class 12 Biology Model Paper 2 — Samacheer Kalvi
Class 12 Biology model paper 2 for Tamil Nadu State Board students with term-wise sections, written answer practice, and time management.
Tamil Nadu Class 12 Biology Question Bank — Samacheer Kalvi
Class 12 Biology question bank for Tamil Nadu State Board students with chapter-wise one-mark, short-answer, long-answer, and term revision practice.
Tamil Nadu Class 12 Biology Term 1 Unit Test — Samacheer Kalvi
Class 12 Biology Term 1 practice test for Tamil Nadu State Board students with questions from reproduction, inheritance, and molecular genetics.
Tamil Nadu Class 12 Biology Term 2 Unit Test — Samacheer Kalvi
Class 12 Biology Term 2 practice test for Tamil Nadu State Board students with questions from inheritance, molecular genetics, evolution, health, and biotechnology.
Tamil Nadu Class 12 Biology Term 3 Unit Test — Samacheer Kalvi
Class 12 Biology term 3 unit test for Tamil Nadu State Board students with term-wise chapter checks, short tests, and correction checklist.
Tamil Nadu Class 12 Biology Biology Textbook Solutions Map — Samacheer Kalvi
Class 12 Biology biology textbook solutions map for Tamil Nadu State Board students with chapter-wise exercise workflow for Bio Botany and Bio Zoology.
Samacheer Kalvi 12th Biology Chapter 1 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 1 Asexual and Sexual Reproduction in Plants exercise solutions with key diagrams, definitions, short answers, and exam tips.
Samacheer Kalvi 12th Biology Chapter 10 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 10 Economically Useful Plants exercise solutions — food crops, fibres, timber, medicinal plants, and exam tips.
Samacheer Kalvi 12th Biology Chapter 11 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 11 Reproduction in Organisms exercise solutions — types of reproduction, asexual modes, sexual reproduction events, and exam tips.
Samacheer Kalvi 12th Biology Chapter 12 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 12 Human Reproduction exercise solutions — male and female reproductive systems, gametogenesis, menstrual cycle, fertilisation, and exam tips.
Samacheer Kalvi 12th Biology Chapter 13 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 13 Reproductive Health exercise solutions — contraception, STDs, infertility, ART (IVF, GIFT, ICSI), and exam tips.
Samacheer Kalvi 12th Biology Chapter 14 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 14 Principles of Inheritance and Variation exercise solutions — Mendel's laws, blood groups, genetic disorders, and exam tips.
Samacheer Kalvi 12th Biology Chapter 15 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 15 Molecular Genetics (Zoology) exercise solutions — Human Genome Project, DNA fingerprinting, gene therapy, and exam tips.
Samacheer Kalvi 12th Biology Chapter 16 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 16 Evolution exercise solutions — theories of evolution, natural selection, Hardy-Weinberg law, evidences, and exam tips.
Samacheer Kalvi 12th Biology Chapter 17 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 17 Human Health and Diseases exercise solutions — immunity types, pathogens, cancer, drugs of abuse, and exam tips.
Samacheer Kalvi 12th Biology Chapter 18 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 18 Microbes in Human Welfare exercise solutions — industrial microbes, biogas, bioremediation, antibiotics, and exam tips.
Samacheer Kalvi 12th Biology Chapter 19 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 19 Biotechnology and its Applications exercise solutions — transgenic organisms, Bt crops, insulin production, gene therapy, bioethics, and exam tips.
Samacheer Kalvi 12th Biology Chapter 2 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 2 Classical Genetics exercise solutions — Mendel's laws, dihybrid cross, codominance, linkage, and exam problem-solving steps.
Samacheer Kalvi 12th Biology Chapter 20 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 20 Organisms and Populations exercise solutions — population attributes, growth models, ecological interactions, and exam tips.
Samacheer Kalvi 12th Biology Chapter 21 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 21 Biodiversity and Conservation exercise solutions — types of biodiversity, threats, in situ and ex situ conservation, hotspots, and exam tips.
Samacheer Kalvi 12th Biology Chapter 22 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 22 Environmental Issues (Zoology) exercise solutions — pollution effects on animals, biomagnification, solid waste, radioactive pollution, and exam tips.
Samacheer Kalvi 12th Biology Chapter 3 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 3 Chromosomal Basis of Inheritance exercise solutions — sex determination, sex-linked inheritance, chromosomal disorders, and exam tips.
Samacheer Kalvi 12th Biology Chapter 4 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 4 Molecular Genetics exercise solutions — DNA structure, replication, transcription, translation, gene regulation, and exam tips.
Samacheer Kalvi 12th Biology Chapter 5 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 5 Environmental Issues (Botany) exercise solutions — pollution, deforestation, conservation, biodiversity, and exam tips.
Samacheer Kalvi 12th Biology Chapter 6 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 6 Principles of Ecology exercise solutions — ecosystem components, energy flow, ecological pyramids, biogeochemical cycles, and exam tips.
Samacheer Kalvi 12th Biology Chapter 7 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 7 Plant Tissue Culture exercise solutions — totipotency, explant, callus, somatic embryogenesis, micropropagation, and exam tips.
Samacheer Kalvi 12th Biology Chapter 8 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 8 Principles and Processes of Biotechnology exercise solutions — recombinant DNA, restriction enzymes, PCR, gel electrophoresis, and exam tips.
Samacheer Kalvi 12th Biology Chapter 9 Exercise Solutions
Tamil Nadu Class 12 Biology Chapter 9 Plant Breeding and Crop Improvement exercise solutions — hybridisation, mutation breeding, green revolution, biofortification, and exam tips.
CBSE Notes
CBSE Class 12 Biology Chapter 15 Notes: Biodiversity and Conservation
Complete local guide for CBSE Class 12 Biology: Biodiversity and Conservation. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 12 Notes: Biotechnology and its Applications
Complete local guide for CBSE Class 12 Biology: Biotechnology and its Applications. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 11 Notes: Biotechnology: Principles and Processes
Complete local guide for CBSE Class 12 Biology: Biotechnology: Principles and Processes. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 14 Notes: Ecosystem
Complete local guide for CBSE Class 12 Biology: Ecosystem. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 16 Notes: Environmental Issues
Complete local guide for CBSE Class 12 Biology: Environmental Issues. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 7 Notes: Evolution
Complete local guide for CBSE Class 12 Biology: Evolution. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 9 Notes: Strategies for Enhancement in Food Production
Complete local guide for CBSE Class 12 Biology: Strategies for Enhancement in Food Production. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 8 Notes: Human Health and Disease
Complete local guide for CBSE Class 12 Biology: Human Health and Disease. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 3 Notes: Human Reproduction
Complete local guide for CBSE Class 12 Biology: Human Reproduction. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 10 Notes: Microbes in Human Welfare
Complete local guide for CBSE Class 12 Biology: Microbes in Human Welfare. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 6 Notes: Molecular Basis of Inheritance
Complete local guide for CBSE Class 12 Biology: Molecular Basis of Inheritance. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 13 Notes: Organisms and Populations
Complete local guide for CBSE Class 12 Biology: Organisms and Populations. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 5 Notes: Principles of Inheritance and Variation
Complete local guide for CBSE Class 12 Biology: Principles of Inheritance and Variation. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 1 Notes: Reproduction in Organisms
Complete local guide for CBSE Class 12 Biology: Reproduction in Organisms. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 4 Notes: Reproductive Health
Complete local guide for CBSE Class 12 Biology: Reproductive Health. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Chapter 2 Notes: Sexual Reproduction in Flowering Plants
Complete local guide for CBSE Class 12 Biology: Sexual Reproduction in Flowering Plants. Includes NCERT-aligned summary, key points, answer-writing tips, common mistakes, and board exam practice.
CBSECBSE Class 12 Biology Exercise Solutions
Comprehensive NCERT exercise solutions for CBSE Class 12 Biology — Reproduction, Genetics and Evolution, Biotechnology, and Ecology with MCQs, short answers, long answers, and exam tips.