Important Questions for Class 12 Biology Chapter Wise with Answers

Get here all the Important questions for Class 12 Biology chapter wise as free PDF download. Here you will get Extra Important Questions with answers, assertion reasoning and Multiple Choice Questions (MCQ's) chapter wise in Printable format. Class 12 Biology has 16 important chapters covering various important topics related to human physiology evolution, diseases, genetics, organisms, populations, etc.Solving Chapter wise questions is one of the best ways to prepare for the examination. Students are advised to understand the concepts and theories of Biology properly before the exam. You can easily find 1 Mark, 2 marks, 3 marks, and 5 marks questions from each chapter of Class 12 Biology and prepare for exam more effectively. These preparation material for Class 12 Biology , shared by teachers, parents and students, are as per latest NCERT and CBSE Pattern syllabus and assure great success in achieving high score in Final CBSE Board Examinations.

Total Papers : 145

CBSE Class 12 Biology Practice Questions Term 1 Biology 1 Mark Questions with Answers Class 12 Chapter 16 Environmental Issues Biology 1 Mark Questions with Answers Class 12 Chapter 15 Biodiversity and Conservation Biology 1 Mark Questions with Answers Class 12 Chapter 14 Ecosystem Biology 1 Mark Questions with Answers Class 12 Chapter 13 Organisms and Populations Biology 1 Mark Questions with Answers Class 12 Chapter 12 Biotechnology and its Application Biology 1 Mark Questions with Answers Class 12 Chapter 11 Biotechnology Principles and Processes
Biology 1 Mark Questions with Answers Class 12 Chapter 10 Microbes in Human Welfare Biology 1 Mark Questions with Answers Class 12 Chapter 9 Strategies for Enhancement in Food Production Biology 1 Mark Questions with Answers Class 12 Chapter 8 Human Health and Diseases Biology 1 Mark Questions with Answers Class 12 Chapter 7 Evolution Biology 1 Mark Questions with Answers Class 12 Chapter 6 Molecular Basis of Inheritance Biology 1 Mark Questions with Answers Class 12 Chapter 5 Principles of Inheritance and Variation Biology 1 Mark Questions with Answers Class 12 Chapter 4 Reproductive Health
Biology 1 Mark Questions with Answers Class 12 Chapter 3 Human Reproduction Biology 1 Mark Questions with Answers Class 12 Chapter 2 Sexual Reproduction in Flowering Plants Biology 1 Mark Questions with Answers Class 12 Chapter 1 Reproduction in Organisms Biology MCQs for Class 12 with Answers Chapter 16 Environmental Issues Biology MCQs for Class 12 with Answers Chapter 15 Biodiversity and Conservation Biology MCQs for Class 12 with Answers Chapter 14 Ecosystem Biology MCQs for Class 12 with Answers Chapter 13 Organisms and Populations
Biology MCQs for Class 12 with Answers Chapter 12 Biotechnology and its Application Biology MCQs for Class 12 with Answers Chapter 11 Biotechnology Principles and Processes Biology MCQs for Class 12 with Answers Chapter 10 Microbes in Human Welfare Biology MCQs for Class 12 with Answers Chapter 9 Strategies for Enhancement in Food Production Biology MCQs for Class 12 with Answers Chapter 8 Human Health and Diseases Biology MCQs for Class 12 with Answers Chapter 7 Evolution Biology MCQs for Class 12 with Answers Chapter 6 Molecular Basis of Inheritance
Biology MCQs for Class 12 with Answers Chapter 5 Principles of Inheritance and Variation Biology MCQs for Class 12 with Answers Chapter 4 Reproductive Health Biology MCQs for Class 12 with Answers Chapter 3 Human Reproduction Biology MCQs for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants Biology MCQs for Class 12 with Answers Chapter 1 Reproduction in Organisms Assertion Reason Questions Biology Class 12 Chapter 16 Environmental Issues Assertion Reason Questions Biology Class 12 Chapter 15 Biodiversity and Conservation Assertion Reason Questions Biology Class 12 Chapter 14 Ecosystem Assertion Reason Questions Biology Class 12 Chapter 13 Organisms and Populations Assertion Reason Questions Biology Class 12 Chapter 12 Biotechnology and its Application Assertion Reason Questions Biology Class 12 Chapter 11 Biotechnology Principles and Processes Assertion Reason Questions Biology Class 12 Chapter 10 Microbes in Human Welfare Assertion Reason Questions Biology Class 12 Chapter 9 Strategies for Enhancement in Food Production Assertion Reason Questions Biology Class 12 Chapter 8 Human Health and Diseases Assertion Reason Questions Biology Class 12 Chapter 7 Evolution Assertion Reason Questions Biology Class 12 Chapter 6 Molecular Basis of Inheritance Assertion Reason Questions Biology Class 12 Chapter 5 Principles of Inheritance and Variation Assertion Reason Questions Biology Class 12 Chapter 4 Reproductive Health Assertion Reason Questions Biology Class 12 Chapter 3 Human Reproduction Assertion Reason Questions Biology Class 12 Chapter 2 Sexual Reproduction in Flowering Plants Assertion Reason Questions Biology Class 12 Chapter 1 Reproduction in Organisms Class 12 Biology Case Study Questions Chapter 16 Environmental Issues Class 12 Biology Case Study Questions Chapter 15 Biodiversity and Conservation Class 12 Biology Case Study Questions Chapter 14 Ecosystem Class 12 Biology Case Study Questions Chapter 13 Organisms and Populations Class 12 Biology Case Study Questions Chapter 12 Biotechnology and its Application Class 12 Biology Case Study Questions Chapter 11 Biotechnology Principles and Processes Class 12 Biology Case Study Questions Chapter 10 Microbes in Human Welfare Class 12 Biology Case Study Questions Chapter 9 Strategies for Enhancement in Food Production Class 12 Biology Case Study Questions Chapter 8 Human Health and Diseases Class 12 Biology Case Study Questions Chapter 7 Evolution Class 12 Biology Case Study Questions Chapter 6 Molecular Basis of Inheritance Class 12 Biology Case Study Questions Chapter 5 Principles of Inheritance and Variation Class 12 Biology Case Study Questions Chapter 4 Reproductive Health Class 12 Biology Case Study Questions Chapter 3 Human Reproduction Class 12 Biology Case Study Questions Chapter 2 Sexual Reproduction in Flowering Plants Class 12 Biology Case Study Questions Chapter 1 Reproduction in Organisms Class 12 Biology Important Extra Question Answers Chapter 16 Environmental Issues Class 12 Biology Important Extra Question Answers Chapter 15 Biodiversity and Conservation Class 12 Biology Important Extra Question Answers Chapter 14 Ecosystem Class 12 Biology Important Extra Question Answers Chapter 13 Organisms and Populations Class 12 Biology Important Extra Question Answers Chapter 11 Biotechnology Principles and Processes Class 12 Biology Important Extra Question Answers Chapter 10 Microbes in Human Welfare Class 12 Biology Important Extra Question Answers Chapter 9 Strategies for Enhancement in Food Production Class 12 Biology Important Extra Question Answers Chapter 8 Human Health and Diseases Class 12 Biology Important Extra Question Answers Chapter 7 Evolution Class 12 Biology Important Extra Question Answers Chapter 6 Molecular Basis of Inheritance Class 12 Biology Important Extra Question Answers Chapter 5 Principles of Inheritance and Variation Class 12 Biology Important Extra Question Answers Chapter 4 Reproductive Health Class 12 Biology Important Extra Question Answers Chapter 3 Human Reproduction Class 12 Biology Important Extra Question Answers Chapter 2 Sexual Reproduction in Flowering Plants Class 12 Biology Important Extra Question Answers Chapter 1 Reproduction in Organisms Important 5 Mark Questions of Biology Class 12 Chapter 16 Environmental Issues Important 5 Mark Questions of Biology Class 12 Chapter 15 Biodiversity and Conservation Important 5 Mark Questions of Biology Class 12 Chapter 14 Ecosystem Important 5 Mark Questions of Biology Class 12 Chapter 13 Organisms and Populations Important 5 Mark Questions of Biology Class 12 Chapter 12 Biotechnology and its Application Important 5 Mark Questions of Biology Class 12 Chapter 11 Biotechnology Principles and Processes Important 5 Mark Questions of Biology Class 12 Chapter 10 Microbes in Human Welfare Important 5 Mark Questions of Biology Class 12 Chapter 9 Strategies for Enhancement in Food Production Important 5 Mark Questions of Biology Class 12 Chapter 8 Human Health and Diseases Important 5 Mark Questions of Biology Class 12 Chapter 7 Evolution Important 5 Mark Questions of Biology Class 12 Chapter 6 Molecular Basis of Inheritance Important 5 Mark Questions of Biology Class 12 Chapter 5 Principles of Inheritance and Variation Important 5 Mark Questions of Biology Class 12 Chapter 4 Reproductive Health Important 5 Mark Questions of Biology Class 12 Chapter 3 Human Reproduction Important 5 Mark Questions of Biology Class 12 Chapter 2 Sexual Reproduction in Flowering Plants Important 5 Mark Questions of Biology Class 12 Chapter 1 Reproduction in Organisms Environmental Issues NEET Previous Year Solved Questions Biodiversity and Conservation NEET Previous Year Solved Questions Organisms and Populations NEET Previous Year Solved Questions Biotechnology and Its Applications NEET Previous Year Solved Questions Biotechnology Principles and Processes NEET Previous Year Solved Questions Microbes in Human Welfare NEET Previous Year Solved Questions Strategies for Enhancement in Food Production NEET Previous Year Solved Questions Human Health and Diseases NEET Previous Year Solved Questions Evolution NEET UG Previous Year Solved Questions Molecular Basis of Inheritance NEET Previous Year Solved Questions Principles of Inheritance and Variation NEET Previous Year Solved Questions Reproductive Health NEET Previous Year Solved Questions Human Reproduction NEET Previous Year Solved Questions Sexual Reproduction in Flowering Plants NEET Previous Year Solved Questions Reproduction in Organisms NEET Previous Year Solved Questions BioFertlizers NEET UG MCQ Questions Biotechnology and its Applications NEET MCQ Questions Growth and Regeneration NEET MCQ Questions Environmental Issues NEET UG MCQ Questions Biodiversity and Conservation NEET MCQ Questions Ecosystems NEET UG MCQ Questions Organisms and Populations NEET UG MCQ Questions Biotechnology Principles and Processes NEET MCQ Questions Microbes in Human Welfare NEET MCQ Questions Strategies for Enhancement in Food Production NEET MCQ Questions Human Health and Diseases NEET MCQ Questions Evolution NEET UG MCQ Questions Molecular Basis of Inheritance NEET MCQ Questions Mendelian Genetics NEET MCQ Questions Reproductive Health NEET UG MCQ Questions Human Reproduction NEET UG MCQ Questions Sexual Reproduction In Flowering Plants NEET MCQ Question Reproduction in Organisms NEET UG MCQ Questions Important Questions & Answers Environmental Issues Class 12 Biology Important Questions & Answers Biodiversity and Conservation Class 12 Important Questions & Answers Ecosystem Class 12 Biology Important Questions and Answers Organisms and Populations Class 12 Important Questions & Answers Biotechnology and Its Applications Class 12 Important Questions & Answers Biotechnology Principles and Processes Class 12 Important Questions & Answers Microbes in Human Welfare Class 12 Important Questions and Answers Strategies for Enhancement in Food Production Class 12 Important Question & Answers Human Health and Disease Class 12 Important Questions & Answers Evolution Chapter 7 Class 12 Biology Important Questions & Answer Class 12 Molecular Basis Inheritance Important Question Answers Principal of Inheritance and Variation Class 12 Reproductive Health Class 12 important questions & Answers Important Questions Class 12 Biology Human Reproduction Important Questions Class 12 Sexual Reproduction in Flowering Plants Reproduction in Organisms Class 12 Important Questions & Answers

Total Papers : 145

Class 12 Biology Marks Distribution
Units Marks
Reproduction 14
Genetics and Evolution 18
Biology and Human Welfare 14
Biotechnology and its Applications 12
Ecology and Environment 12
Total 70

CBSE Class 12 Biology Syllabus

  • Reproduction in Organisms
  • Sexual Reproduction in Flowering Plants
  • Human Reproduction
  • Reproductive Health
  • Principles of Inheritance and Variation
  • Molecular Basis of Inheritance
  • Evolution
  • Human Health and Diseases
  • Strategies for Enhancement in Food Production
  • Microbes in Human Welfare
  • Biotechnology - Principles and Processes
  • Biotechnology and its Application
  • Organisms and Populations
  • Ecosystem
  • Biodiversity and its Conservation
  • Environmental Issues

Course Syllabus Details

Unit VI. Reproduction

Chapter 1: Reproduction in Organisms

  • Reproduction
    • A characteristic feature of all organisms for continuation of species
  • Modes of Reproduction −
    • Asexual reproduction
    • Sexual reproduction
  • Asexual reproduction −
    • Modes-Binary fission
    • Sporulation
    • Budding
    • Gemmule
    • Fragmentation
    • vegetative propagation in plants

Chapter 2: Sexual Reproduction in Flowering Plants

  • Flower structure
  • Development of male and female gametophytes
  • Pollination −
    • Types
    • Agencies
    • Examples
  • Outbreeding devices
  • Pollen-Pistil interaction
  • Double fertilization
  • Post fertilization Events-Development of endosperm and embryo
  • Development of seed and formation of fruit
  • Special modes −
    • Apomixes
    • Parthenocarpy
    • Polyembryony
  • Significance of seed and fruit formation

Chapter 3: Human Reproduction

  • Male and female reproductive systems
  • Microscopic anatomy of testis and ovary
  • Gametogenesis −
    • Spermatogenesis
    • Oogenesis
  • Menstrual cycle
  • Fertilisation embryo development up to blastocyst formation, implantation pregnancy and placenta formation (Elementary idea)
  • Parturition (Elementary idea)
  • Lactation (Elementary idea)

Chapter 4: Reproductive Health

  • Need for reproductive health and prevention of sexually transmitted diseases (STD)
  • Birth control −
    • Need and Methods
    • Contraception
    • Medical Termination of Pregnancy (MTP)
  • Amniocentesis
  • Infertility and assisted reproductive technologies −
    • IVF
    • ZIFT
    • GIFT (Elementary idea for general awareness)

Unit VII. Genetics and Evolution

Chapter 5: Principles of Inheritance and Variation

  • Mendelian Inheritance
  • Deviations from Mendelism −
    • Incomplete dominance
    • Co-dominance
    • Multiple alleles
    • Inheritance of blood groups
    • Pleiotropy
  • Elementary idea of polygenic inheritance
  • Chromosome theory of inheritance
  • Chromosomes and genes
  • Sex determination in −
    • Humans
    • Birds
    • Honey bee
  • Linkage and crossing over
  • Sex linked inheritance −
    • Haemophilia
    • Colour blindness
  • Mendelian disorder in humans
    • Thalassemia
  • Chromosomal disorders in humans −
    • Down's syndrome
    • Turner's
    • Klinefelter's syndromes

Chapter 6: Molecular Basis of Inheritance

  • Search for genetic material and DNA as genetic material
  • Structure of DNA and RNA
  • DNA packaging
  • DNA replication
  • Central dogma
  • Transcription, genetic code, translation
  • Gene expression and regulation −
    • Lac Operon
  • Genome and human ganeome project
  • DNA fingerprinting

Chapter 7: Evolution

  • Origin of life
  • Biological evolution and evidences for biological evolution (Paleontological, comparative anatomy, embryology and molecular evidence)
  • Darwin's contribution
  • Modern Synthetic theory of Evolution
  • Mechanism of evolution −
    • Variation (Mutation and Recombination)
    • Natural Selection with examples
    • Types of natural selection
  • Gene flow and genetic drift
  • Hardy - Weinberg's principle
  • Adaptive Radiation
  • Human evolution

Unit VIII. Biology and Human Welfare

Chapter 8: Human Health and Diseases

  • Pathogens - parasites causing human diseases −
    • Malaria
    • Filariasis
    • Ascariasis
    • Typhoid
    • Pneumonia
    • Common cold
    • Amoebiasis
    • Ring worm
  • Basic concepts of immunology – Vaccines −
    • Cancer
    • HIV
    • AIDs
  • Adolescence, drug and alcohol abuse

Chapter 9: Strategies for Enhancement in Food Production

  • Improvement in food production −
    • Plant breeding
    • Tissue culture
    • Single cell protein
    • Biofortification
    • Apiculature
    • Animal husbandry

Chapter-10: Microbes in Human Welfare

  • In household food processing
  • Industrial production
  • Sewage treatment
  • Energy generation and as biocontrol agents
  • Biofertilizers
  • Antibiotics −
    • Production and judicious use

Unit IX. Biotechnology and Its Applications

Chapter 11: Biotechnology - Principles and Processes

  • Genetic engineering (Recombinant DNA technology).

Chapter 12: Biotechnology and its Application

  • Application of Biotechnology in health and agriculture −
    • Human insulin and vaccine production, gene therapy
    • Genetically modified organisms - Bt crops
    • Transgenic Animals; biosafety issues, biopiracy and patents

Unit X. Ecology and Environment

Chapter 13: Organisms and Populations

  • Organisms and environment −
    • Habitat
    • Niche
    • Population
    • Ecological adaptations
  • Population interactions −
    • Mutualism
    • Competition
    • Predation
    • Parasitism
  • Population attributes −
    • Growth
    • Birth rate
    • Death rate
    • Age distribution

Chapter 14: Ecosystem

  • Patterns
  • Components
  • Productivity
  • Decomposition
  • Energy flow
  • Pyramids of number, biomass, energy
  • Nutrient cycles (carbon and phosphorous)
  • Ecological succession
  • Ecological services −
    • Carbon fixation
    • Pollination
    • Seed dispersal
    • Oxygen release (in brief)

Chapter-15: Biodiversity and its Conservation

  • Concept of biodiversity
  • Patterns of biodiversity
  • Importance of biodiversity
  • Loss of biodiversity
  • Biodiversity conservation −
    • Hotspots
    • Endangered organisms
    • Extinction
    • Red data book
    • Biosphere reserves
    • National parks
    • Sanctuaries
    • Ramsar sites

Chapter-16: Environmental Issues

  • Air pollution and its control
  • Water pollution and its control
  • Agrochemicals and their effects
  • Solid waste management
  • Radioactive waste management
  • Greenhouse effect and climate change
  • Ozone layer depletion
  • Deforestation
  • Any one case study as success story addressing environmental issue(s).

Practical Works

Part A: List of Experiments

  • Study pollen germination on a slide.
  • Collect and study soil from at least two different sites and study them for texture, moisture content, pH and water holding capacity. Correlate with the kinds of plants found in them.
  • Collect water from two different water bodies around you and study them for pH, clarity and presence of any living organisms.
  • Study the presence of suspended particulate matter in air at two widely different sites.
  • Study of plant population density by quadrat method.
  • Study of plant population frequency by quadrat method.
  • Prepare a temporary mount of onion root tip to study mitosis.
  • Study the effect of different temperatures and three different pH on the activity of salivary amylase on starch.
  • Isolation of DNA from available plant material such as spinach, green pea seeds, papaya, etc.

Part B: Study/observation of the following (Spotting)

  • Flowers adapted to pollination by different agencies (wind, insect, bird).
  • Pollen germination on stigma through a permanent slide.
  • Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice).
  • Meiosis in onion bud cell or grasshopper testis through permanent slides.
  • T.S. of blastula through permanent slides.
  • Mendelian inheritance using seeds of different colour/sizes of any plant.
  • Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow's peak and colour blindness.
  • Controlled pollination - emasculation, tagging and bagging.
  • Common disease causing organisms like Ascaris, Entamoeba, Plasmodium, Roundworm through permanent slides or specimens. Comment on symptoms of disease that they cause.
  • Two plants and two animals (models/virtual images) found in xeric conditions. Comment upon their morphological adaptations.
  • Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological adaptations.

Structure of CBSE Biology Sample Paper for Class 12 Science is

Type of Question Marks per Question Total No. of Questions Total Marks
Very Short Answer Type Questions 1 5 5
Short Answer Type Questions - 1 2 7 14
Short Answer Type Questions - 2 3 12 36
Long Answer Type Questions 3 5 15
Total 27 70

For Preparation of exams students can also check out other resource material

CBSE Class 12 Biology Sample Papers

CBSE Class 12 Biology Worksheets

CBSE Class 12 Biology Question Papers

CBSE Class 12 Biology Test Papers

CBSE Class 12 Biology Revision Notes

Importance of Question Bank for Exam Preparation?

There are many ways to ascertain whether a student has understood the important points and topics of a particular chapter and is he or she well prepared for exams and tests of that particular chapter. Apart from reference books and notes, Question Banks are very effective study materials for exam preparation. When a student tries to attempt and solve all the important questions of any particular subject , it becomes very easy to gauge how much well the topics have been understood and what kind of questions are asked in exams related to that chapter.. Some of the other advantaging factors of Question Banks are as follows

  1. Since Important questions included in question bank are collections of questions that were asked in previous exams and tests thus when a student tries to attempt them they get a complete idea about what type of questions are usually asked and whether they have learned the topics well enough. This gives them an edge to prepare well for the exam.Students get the clear idea whether the questions framed from any particular chapter are mostly either short or long answer type questions or multiple choice based and also marks weightage of any particular chapter in final exams.
  2. CBSE Question Banks are great tools to help in analysis for Exams. As it has a collection of important questions that were asked previously in exams thereby it covers every question from most of the important topics. Thus solving questions from the question bank helps students in analysing their preparation levels for the exam. However the practice should be done in a way that first the set of questions on any particular chapter are solved and then solutions should be consulted to get an analysis of their strong and weak points. This ensures that they are more clear about what to answer and what can be avoided on the day of the exam.
  3. Solving a lot of different types of important questions gives students a clear idea of what are the main important topics of any particular chapter that needs to focussed on from examination perspective and should be emphasised on for revision before attempting the final paper. So attempting most frequently asked questions and important questions helps students to prepare well for almost everything in that subject.
  4. Although students cover up all the chapters included in the course syllabus by the end of the session, sometimes revision becomes a time consuming and difficult process. Thus, practicing important questions from Question Bank allows students to check the preparation status of each and every small topic in a chapter. Doing that ensures quick and easy insight into all the important questions and topics in each and every individual. Solving the important questions also acts as the revision process.
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