Tutorialspoint

STEP 1

Learn from HD Video Lectures

STEP 2

Revise the Concept using Study Notes

STEP 3

Test your Learning with Quizzes & Assessments

STEP 4

Clear your Doubts 24x7

Ask Your Doubts

12th Class Biology - Preview

  • Reproduction in Organisms
    HD Video Lectures - 10, Questions - 25
    • Introduction to Reproduction in Organisms
    • What Is Sexual Reproduction?
    • Sexual Reproduction – Pre-Fertilisation Events
    • Sexual Reproduction – Fertilisation Events
    • Asexual Reproduction in Unicellular Organisms
    • Asexual Reproduction – Spores, Fragmentation and Regeneration
    • Sexual Fertilisation – Post Fertilisation Events
    • Natural Vegetative Propagation
    • Artificial Vegetative Propagation – Cutting and Grafting
    • Artificial Vegetative Propagation – Layering and Micropropagation
    Sexual Reproduction in Flowering Plants
    HD Video Lectures - 16, Questions - 25
    • Structure of Stamen and Microsporangia
    • Anther Development and Microsporogenesis
    • Structure of Pollen Grains and Formation of Male Gametophyte
    • Structure of Pistil and Ovule or Megasporangium
    • Types of Ovules
    • Megasporogenesis and Embryo Sac Formation
    • Self-Pollination and Its Types
    • Cross-Pollination and Its Adaptation
    • Cross-Pollination: Part 1
    • Cross-Pollination: Part 2
    • Pollen-Pistil Interaction – Compatibility
    • Double Fertilisation and Triple Fusion
    • Endosperm and Its Types
    • Embryo Development in Dicots
    • Embryo Development in Monocots
    • Apomixis and Polyembryony
    Human Reproduction
    HD Video Lectures - 30, Questions - 25
    • Introduction to Reproduction
    • Testes and Scrotal Sac
    • Seminiferous Tubules
    • Accessory Ducts
    • What Is Semen?
    • Accessory Sex Glands
    • Understanding Spermatogenesis
    • Spermiation, Capacitation and Factors Controlling Spermatogenesis
    • Structure of the Penis and Sperm
    • Ovary – The Primary Female Sex Organ
    • The Womb (Uterus)
    • The Structure of Ovum
    • Fallopian Tubes and Vagina
    • External Genitalia or Vulva
    • Mammary Glands
    • Transport of Egg and Insemination
    • Hormones Involved During Pregnancy
    • What Is Parturition?
    • Defining Fertilisation
    • Cleavage and Blastocyst Formation
    • Understanding Implantation
    • Placenta – Structure and Function
    • What Is Lactation?
    • Breast Feeding and Its Importance
    • Understanding Oogenesis
    • Menstrual Cycle
    • Ante-Natal Diagnostic Tests
    • Second Week of Development
    • Third Week of Development
    • Disorders Related to Human Reproduction
    Reproductive Health
    HD Video Lectures - 12, Questions - 25
    • Introduction to Reproductive Health
    • Maternity and Child Health Programme
    • Issues, Requirements and Benefits of Awareness Programme
    • Population Explosion
    • Natural Methods of Birth Control
    • Barrier Methods of Birth Control
    • Hormonal and Surgical Methods of Birth Control
    • Medical Termination of Pregnancy
    • STDs – Syphilis, Trichomoniasis and Hepatitis
    • STDs – Gonorrhoea and Genital Herpes
    • Infertility in Men and Women
    • Assisted Reproductive Technologies
    Principle of Inheritance and Variation
    HD Video Lectures - 30, Questions - 25
    • Monohybrid Cross
    • Practice Problems on Monohybrid Cross
    • Laws of Mendel – Dominance, Segregation
    • Incomplete Dominance
    • What Is Codominance?
    • Practice Questions on Incomplete Dominance and Codominance
    • Dihybrid Cross and Law of Independent Assortment
    • Practice Questions on Dihybrid Cross
    • Test Cross and Backcross – Monohybrid and Dihybrid
    • Chromosomal Theory of Inheritance
    • Experimental Verification of Chromosomal Theory of Inheritance
    • Crossing Over and Recombination in Inheritance of Gene
    • Genetic Linkage
    • Types of Linkage
    • Genetic Map and Detection of Linkage
    • Polygenic Inheritance and Pleiotropism
    • Multiple Allelism and Its Examples
    • Understanding Epistasis
    • Complementary Gene and Supplementary Gene
    • Mechanism of Sex Determination – Different Methods
    • Sex-Linked Inheritance
    • Mutations – Point Mutation
    • Mutations – Structural Chromosomal Mutation
    • Numerical Chromosome Disorders – Euploidy and Aneuploidy
    • Down’s Syndrome, Kleinfelter’s Syndrome and Turner’s Syndrome
    • Autosomal Dominant Mendelian Disorders
    • Autosomal Recessive Mendelian Disorders
    • Sex-Linked Mendelian Disorders
    • Pedigree Analysis
    • Problems on Pedigree Analysis
    Molecular Basis of Inheritance
    HD Video Lectures - 26, Questions - 25
    • Nucleic Acid Structure
    • Structure of DNA
    • Process of DNA Packaging
    • Search for Genetic Material – Griffith Experiment
    • DNA Is the Genetic Material – The Hershey-Chase Experiment
    • Models of DNA Replication
    • The Meselson-Stahl Experiment
    • Machinery of DNA Replication
    • Mechanism of DNA Replication
    • Difference Between Eukaryotic Replication and Prokaryotic Replication
    • Introduction to Transcription and Transcription Unit
    • Process of Transcription – Prokaryotes
    • Process of Transcription – Eukaryotes and RNA Processing
    • RNA and Its Types
    • Structure of mRNA – Eukaryotes and Prokaryotes
    • Structure of tRNA – Adaptor Molecule
    • Genetic Code and Its Discovery
    • Genetic Code, Role of tRNA and the Wobble Hypothesis
    • Introduction to Translation and Structure of Ribosomes
    • Initiation of Translation in Prokaryotes and Eukaryotes
    • Elongation and Termination of Translation
    • Gene Regulation in Prokaryotes and Eukaryotes
    • Operon Concept and Lac Operon
    • Genome, HGP
    • DNA Fingerprinting – Introduction
    • DNA Fingerprinting – Method and Applications
    Evolution
    HD Video Lectures - 29, Questions - 25
    • Introduction to Evolution
    • Evolution and Big Bang Theory
    • Theories of Origin of Life
    • Chemical Evolution
    • Biological Evolution
    • Oxygen Evolution and Evidences in Favour of Chemical Evolution
    • Paleontological Evidences of Evolution
    • Archaeopteryx and Pedigree of Evolution
    • Geological Time Scale
    • Homology and Analogy
    • Adaptive Divergence and Adaptive Convergence
    • Evidences From Vestigial Organs, Atavistic Features and Connecting Links
    • Lamarck’s Theory and Weismann's Theory
    • Evidences of Organic Evolution From Embryology and Biogeography
    • Theory of Natural Selection
    • Neo-Darwinism
    • Genetic Drift
    • Examples of Natural Selection
    • Genetic Basis of Adaption, Lederberg Experiment and Types of Natural Selection
    • Speciation and Mimicry
    • Types of Evolution and Reproductive Isolation
    • Similarities and Differences Between Apes and Humans
    • Dryopithecus and Australopithecus
    • Pre-Historic Man – Homo habilis and Homo erectus
    • Homo sapiens – Neanderthal, Cro-Magnon and Modern Man
    • Evolution of Plants
    • A Brief Account of Evolution as a Whole
    • Evolution of Animals
    • Fossil Records and Hardy-Weinberg Principle
    Human Health and Disease
    HD Video Lectures - 28, Questions - 25
    • Introduction to Human Health and Diseases
    • Disease and Its Classification
    • Bacterial Diseases – Typhoid Fever and Tuberculosis
    • Bacterial Diseases – Diphtheria, Pneumonia, Cholera and Plague
    • Viral Diseases – Common Cold, Influenza, Measles, Mumps and Chicken Pox
    • Viral Diseases – Dengue, Chikungunya
    • Fungal Diseases – Ringworm, Candidiasis
    • Helminth Diseases – Ascariasis
    • Helminth Diseases – Filariasis
    • Immunity and Its Types
    • Innate Immunity
    • Protozoan Diseases – Amoebiasis
    • Acquired Immunity – Humoral Immune Response
    • Antigen – Antibody
    • Cell-Mediated Immunity
    • Active Immunisation
    • Passive Immunisation
    • Allergy and Its Types
    • Understanding Autoimmunity
    • Primary Lymphoid Organs
    • Secondary Lymphoid Organs
    • Cancer – Properties of Cancer Cells and Types of Tumours
    • Cause of Cancer and Its Types
    • Cancer – Diagnosis and Treatment
    • Types of Drugs and Adolescents
    • Effects of Drug Abuse and Prevention
    • AIDS and HIV – I
    • AIDS and HIV – II
    Strategies for Enhancement in Food Production
    HD Video Lectures - 19, Questions - 25
    • Introduction to Strategies for Enhancement in Food Production
    • Animal Husbandry and Dairy Farm Management
    • Poultry Farm Management
    • Animal Breeding
    • Types of Breeding
    • Controlled Breeding Experiments
    • Learning About Beekeeping
    • What Are Fisheries?
    • Plant Breeding and Its Goals
    • Steps of Plant Breeding
    • Plant Breeding for Improvement of Yield
    • Plant Breeding for Disease Resistance
    • Plant Breeding for Pest Resistance
    • Plant Breeding for Improved Food Quality
    • Single Cell Protein
    • Plant Tissue Culture
    • Types of Plant Tissue Culture
    • Somatic Hybridization
    • Application of Plant Tissue Culture
    Microbes in Human Welfare
    HD Video Lectures - 13, Questions - 25
    • Microbes in Human Welfare – Introduction
    • Microbes in the Formation of Curd and Dough
    • Fermented Beverages
    • Microorganisms – Toddy and Cheese
    • Microorganisms in Antibiotics
    • Microbes in Chemicals, Enzymes and Other Bioactive Molecules
    • Microbes in Sewage Treatment
    • Microbes in Biogas Production
    • Understanding Bioherbicide
    • Understanding Bioinsecticide
    • Microbes As Biofertilizers
    • Integrated Pest Management
    • Some Important Biofertilizers
    Biotechnology: Principles and Processes
    HD Video Lectures - 18, Questions - 25
    • Basics of Genetic Engineering and Recombinant DNA Technology
    • Restriction Enzyme and Mechanism of Action
    • Types and Nomenclature of Restriction Enzyme
    • Other Tools for Creating Recombinant DNA – Ligase, Linkers, Adaptors and Homopolymers
    • Features of a Typical Cloning Vector
    • Cloning Vectors – Plasmids
    • Cloning Vectors – Bacteriophages
    • Some Other Cloning Vectors
    • Cloning Vectors in Plants
    • Isolation of DNA
    • Separation and Isolation of DNA Fragments – Gel Electrophoresis
    • Polymerase Chain Reaction
    • Transformation in Competent Host – Chemical Methods
    • Transformation in Competent Host – Physical Methods
    • Selection of Transformed Cells
    • Recombinant Protein, Types and Uses and Downstream Processing
    • Bioreactors and Their Types
    • cDNA and Synthetic DNA
    Biotechnology and Its Applications
    HD Video Lectures - 15, Questions - 25
    • Introduction to Applications of Biotechnology
    • Insect-Resistant Plants – Bt Cotton
    • Pest-Resistant Plants – RNAi Technique
    • Important GM Crops and Other Transgenic Plants
    • Genetically Engineered Insulin
    • Molecular Farming and Other Recombinant Proteins
    • Genetically Engineered Vaccine Production
    • Gene Therapy
    • Molecular Diagnosis
    • Transgenic Animals – Procedure and Examples
    • Applications of Transgenic Animals
    • Ethical Issues (GEAC)
    • Understanding Biopatents
    • What Is Biopiracy?
    • Genetically Engineered Microbes
    Organisms and Populations
    HD Video Lectures - 20, Questions - 25
    • Abiotic Factors – Light
    • Abiotic Factors – Soil, Water, Topography
    • Abiotic Factors – Temperature
    • Understanding Adaptations
    • What Are Biomes?
    • All About Community
    • Ecological Hierarchy
    • Ecology and Related Terms
    • Life History Variation
    • What Is Mutualism?
    • Negative Interaction – Competition
    • Organism and Population
    • Understanding Parasitism
    • Population Attributes
    • Population Growth
    • Population Interactions
    • Positive Interaction – Protocooperation and Commensalism
    • Predation and Amensalism
    • Population Growth Models
    • Response to Abiotic Factors
    Ecosystem
    HD Video Lectures - 12, Questions - 25
    • Ecosystem and Types
    • Components of Ecosystem
    • Ecosystem Structure and Function
    • Understanding Productivity
    • What Is Decomposition?
    • Food Chain
    • Food Web, Energy Flow
    • Ecological Pyramids
    • Ecological Succession and Types
    • Succession of Plants
    • Nutrient Cycling
    • Ecosystem Services
    Biodiversity and Conservation
    HD Video Lectures - 9, Questions - 25
    • Biodiversity and Its Types
    • Species Distribution in India and the World
    • Patterns of Biodiversity
    • Importance of Species Diversity to the Ecosystem
    • Loss of Biodiversity
    • Causes of Biodiversity Loss
    • Need for Biodiversity Conservation
    • Conservation of Biodiversity – In Situ Conservation
    • Conservation of Biodiversity – Ex Situ Conservation
    Environmental Issues
    HD Video Lectures - 17, Questions - 25
    • Pollution, Air Pollution and Air Pollutants
    • Control of Air Pollution
    • Case Study on Air Pollution
    • Noise Pollution
    • Water Pollution – Causes and Effects
    • Biological Oxygen Demand, Chemical Oxygen Demand and Eutrophication
    • What Is Biomagnification?
    • Control of Water Pollution
    • A Case Study of the Integrated Waste Water Treatment
    • Solid Waste and Its Types
    • Solid Waste Management
    • Case Study on the Remedy for Plastic Wastes
    • Agrochemicals, Effects, Case Study of Organic Farming
    • Greenhouse Effect and Global Warming
    • Ozone Depletion
    • Radioactive Waste, Deforestation and Improper Resource Utilisation
    • Case Study of the People’s Participation in Conservation of Forests