Biology | Class 9

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    Chapter 1 Nature of Science in Biology (27 videos) (Practice Test) (Exercises Exercise Answers)

      1.1: Definition of Biology (Practice Test)
      Introduction to Biology
    1. Introduction to Biology
      65455 views
      1.2: Quran Instructs to Reveal Study of Life (Practice Test)
      Contribution of Muslim Scientists (Research on Kidney Diseases)
    1. Contribution of Muslim Scientists (Research on Kidney Diseases)
      1936 views
      2. Contributions of Muslim Scientists (Research on Eyes)
    2. Contributions of Muslim Scientists (Research on Eyes)
      1222 views
      1.3: Major Fields of Biology (Practice Test)
      Branches of Biology: Botany, Zoology and Microbiology
    1. Branches of Biology: Botany, Zoology and Microbiology
      30244 views
      1.4: Branches of Biology (Practice Test)
      Branches of Biology: Cell Biology and Histology
    1. Branches of Biology: Cell Biology and Histology
      7585 views
      2. Branches of Biology: Genetics and Embryology
    2. Branches of Biology: Genetics and Embryology
      7526 views
      3. Branches of Biology: Human Biology and Molecular Biology
    3. Branches of Biology: Human Biology and Molecular Biology
      4. Branches of Biology: Marine Biology And Fresh Water Biology
    4. Branches of Biology: Marine Biology And Fresh Water Biology
      5. Branches of Biology: Immunology, Entomology and Pharmacology
    5. Branches of Biology: Immunology, Entomology and Pharmacology
      3194 views
      6. Branches of Biology: Morphology, Anatomy and Physiology
    6. Branches of Biology: Morphology, Anatomy and Physiology
      11586 views
      7. Branches of Biology: Environmental Biology, Taxonomy and Paleontology
    7. Branches of Biology: Environmental Biology, Taxonomy and Paleontology
      7251 views
      8. Branches of Biology: Biotechnology and Biochemistry
    8. Branches of Biology: Biotechnology and Biochemistry
      4004 views
      1.5: Relationship of Biology with other Sciences (Practice Test)
      Relationship of Biology with Other Sciences
    1. Relationship of Biology with Other Sciences
      8888 views
      2. Relationship of Biology With Other Science (Continued)
    2. Relationship of Biology With Other Science (Continued)
      5505 views
      1.6: Careers in Biology (Practice Test)
      Agriculture, Forestry
    1. Agriculture, Forestry
      157 views
      2. Animal Husbandry
    2. Animal Husbandry
      3. Fish Farming, Fuel
    3. Fish Farming, Fuel
      296 views
      1.7: Biology as a Part of Natural and Life Sciences (Practice Test)
      Relationship of Biology with Other Sciences
    1. Relationship of Biology with Other Sciences
      8888 views
      2. Relationship of Biology With Other Science (Continued)
    2. Relationship of Biology With Other Science (Continued)
      5505 views
      1.8: Science is a Collaborative Field (Practice Test)
      Human Curiosity And Social Development
    1. Human Curiosity And Social Development
      1.9: Steps of Scientific Method (Practice Test)
      Biological Method / Scientific Method
    1. Biological Method / Scientific Method
      24526 views
      2. Biological Method / Scientific Method (Continued)
    2. Biological Method / Scientific Method (Continued)
      12596 views
      1.10: Steps Involved in Biological Method (Practice Test)
      Biological Method / Scientific Method
    1. Biological Method / Scientific Method
      24526 views
      2. Biological Method / Scientific Method (Continued)
    2. Biological Method / Scientific Method (Continued)
      12596 views
      3. Malaria: An Example of Biological Method of Study
    3. Malaria: An Example of Biological Method of Study
      7761 views
      4. Malaria An Example of Biological Method of Study (Continued)
    4. Malaria An Example of Biological Method of Study (Continued)
      4085 views
      1.11: Role of Hypothesis, Theory and Law in the Research Work of Natural Sciences (Practice Test)
      Theory, Law and Principle in Biological Method
    1. Theory, Law and Principle in Biological Method
      6279 views

    Chapter 2 Molecular Biology (22 videos) (Practice Test) (Exercises Exercise Answers)

      2.1: Biochemistry and Molecular Biology (Practice Test)
      Branches of Biology: Biotechnology and Biochemistry
    1. Branches of Biology: Biotechnology and Biochemistry
      4004 views
      2. Branches of Biology: Human Biology and Molecular Biology
    2. Branches of Biology: Human Biology and Molecular Biology
      2.2: Common Biomolecules (Practice Test)
      Fundamental Biological Molecules
    1. Fundamental Biological Molecules
      2.3: Proteins (Practice Test)
      Proteins
    1. Proteins
      4718 views
      2. Structure of Amino Acid
    2. Structure of Amino Acid
      7394 views
      3. Structure of Protein
    3. Structure of Protein
      9505 views
      4. Function of Protein
    4. Function of Protein
      2736 views
      2.4: Lipids (Practice Test)
      Fatty Acids to Lipids
    1. Fatty Acids to Lipids
      951 views
      2. Conjugated Molecules (Glycoprotein and Glyco-Lipids)
    2. Conjugated Molecules (Glycoprotein and Glyco-Lipids)
      4638 views
      2.5: Carbohydrates (Practice Test)
      Carbohydrates
    1. Carbohydrates
      3936 views
      2. Functions of Carbohydrates
    2. Functions of Carbohydrates
      8359 views
      2.6: Types of Carbohydrates (Practice Test)
      Classification of Carbohydrates
    1. Classification of Carbohydrates
      284 views
      2. Disaccharides
    2. Disaccharides
      300 views
      2.7: Structure of DNA (Practice Test)
      Mononucleotide
    1. Mononucleotide
      7630 views
      2. Advance (Watson and Crick's Model)
    2. Advance (Watson and Crick's Model)
      65841 views
      2.8: Function of DNA (Practice Test)
      Heredity
    1. Heredity
      2. Point Mutation
    2. Point Mutation
      2870 views
      2.9: Structure of RNA (Practice Test)
      Comparison of DNA and RNA
    1. Comparison of DNA and RNA
      2458 views
      2. Types of RNA
    2. Types of RNA
      13828 views
      2.10: Function of RNA (Practice Test)
      RNA As A Carrier of Genetic Information
    1. RNA As A Carrier of Genetic Information
      2529 views
      2.11: Protein Synthesis (Practice Test)
      Transcription
    1. Transcription
      18325 views
      2. Translation
    2. Translation
      15338 views

    Chapter 3 Cell and Subcellular Organelles (31 videos) (Practice Test) (Exercises Exercise Answers)

      3.1: Cell is the Basic Unit of Life (Practice Test)
      Cell
    1. Cell
      7353 views
      3.2: Animal and Plant Cell (Practice Test)
      Difference between Plant and Animal Cell
    1. Difference between Plant and Animal Cell
      2077 views
      2. Structure of A Plant Cell
    2. Structure of A Plant Cell
      2934 views
      3. Structure of An Animal Cell
    3. Structure of An Animal Cell
      4145 views
      3.3: Subcellular Organelles (Practice Test)
      Cell wall
    1. Cell wall
      36672 views
      2. Cell Membrane
    2. Cell Membrane
      24850 views
      3. Cytoplasm, Cytoskeleton
    3. Cytoplasm, Cytoskeleton
      17752 views
      4. Nucleus
    4. Nucleus
      17830 views
      5. Endoplasmic Reticulum (ER),Ribosomes
    5. Endoplasmic Reticulum (ER),Ribosomes
      14548 views
      6. Golgi Apparatus and Lysosomes
    6. Golgi Apparatus and Lysosomes
      22182 views
      7. Mitochondria
    7. Mitochondria
      15515 views
      8. Centrioles
    8. Centrioles
      17135 views
      9. Plastids
    9. Plastids
      13337 views
      10. Vacuoles
    10. Vacuoles
      11106 views
      3.4: Structural Advantages of Plant and Animal Cell (Practice Test)
      Structure of A Plant Cell
    1. Structure of A Plant Cell
      2934 views
      2. Structure of An Animal Cell
    2. Structure of An Animal Cell
      4145 views
      3.5: Different Types of Cells (Practice Test)
      Mesophyll Tissues
    1. Mesophyll Tissues
      2. Types of Animal Cells
    2. Types of Animal Cells
      17 views
      3.6: Concept of Division of Labor
      Contribution of Various Cells for the Healthy Functioning of Human Body
    1. Contribution of Various Cells for the Healthy Functioning of Human Body
      2. Relation Between The Functions and Structures of Tissues
    2. Relation Between The Functions and Structures of Tissues
      3.7: Cell Specialization
      Stem cells: Embryonic And Adult Stem Cells
    1. Stem cells: Embryonic And Adult Stem Cells
      3.8: Cell Cycle (Practice Test)
      Cell Cycle
    1. Cell Cycle
      20785 views
      3.9: Mitosis (Practice Test)
      Mitosis, Prophase
    1. Mitosis, Prophase
      30609 views
      2. Anaphase, Telophase of Mitosis
    2. Anaphase, Telophase of Mitosis
      16891 views
      3. More on Mitosis, Cytokinesis
    3. More on Mitosis, Cytokinesis
      10975 views
      4. Significance of Mitosis
    4. Significance of Mitosis
      10862 views
      3.10: Meiosis (Practice Test)
      Meiosis I (Prophase I)
    1. Meiosis I (Prophase I)
      8802 views
      2. Metaphase I, Anaphase I and Telophase I
    2. Metaphase I, Anaphase I and Telophase I
      15853 views
      3.11: Comparison of Mitosis and Meiosis (Practice Test)
      Comparison of Mitosis and Meiosis
    1. Comparison of Mitosis and Meiosis
      3684 views
      3.12: Significance of Meiosis (Practice Test)
      Significance of Meiosis
    1. Significance of Meiosis
      8647 views
      3.13: Stem Cells as Unspecialized Cells
      Stem cells: Embryonic And Adult Stem Cells
    1. Stem cells: Embryonic And Adult Stem Cells

    Chapter 4 Tissues, Organs and Systems (25 videos) (Practice Test) (Exercises Exercise Answers)

      4.1: Tissues, Organs and Systems (Practice Test)
      Tissues and Organs
    1. Tissues and Organs
      68 views
      2. Mesophyll Tissues
    2. Mesophyll Tissues
      4.2: Levels of Organization (Practice Test)
      Levels of Biological Organization: Organelle, Cell and Tissue Level
    1. Levels of Biological Organization: Organelle, Cell and Tissue Level
      9099 views
      2. Levels of Biological Organization: Organ and Organ System Levels
    2. Levels of Biological Organization: Organ and Organ System Levels
      8716 views
      4.3: Composition of Stomach on Tissue Level (Practice Test)
      Stomach Digestion
    1. Stomach Digestion
      11097 views
      2. More on Digestion of Food in the Stomach
    2. More on Digestion of Food in the Stomach
      2147 views
      4.4: Composition of a Leaf on Tissue Level (Practice Test)
      Internal Structure of Leaf
    1. Internal Structure of Leaf
      2993 views
      4.5: Human Body (Practice Test)
      Digestive System
    1. Digestive System
      2514 views
      2. Structure of Human Respiratory System
    2. Structure of Human Respiratory System
      5520 views
      3. Working of Circulatory System
    3. Working of Circulatory System
      287 views
      4. The Human Reproductive Process
    4. The Human Reproductive Process
      97 views
      5. Nervous System
    5. Nervous System
      455 views
      6. Important endocrine gland
    6. Important endocrine gland
      9123 views
      4.6: Disorders of Different Organ Systems (Practice Test)
      Bulimia Nervosa, Ulcer
    1. Bulimia Nervosa, Ulcer
      3201 views
      2. More on Myocardial Infarction
    2. More on Myocardial Infarction
      758 views
      3. Pneumonia
    3. Pneumonia
      146 views
      4. Brain Tumors
    4. Brain Tumors
      1249 views
      5. Thyroid Gland
    5. Thyroid Gland
      10441 views
      4.7: Homeostasis (Practice Test)
      Osmoregulation, Thermoregulation and Excretion
    1. Osmoregulation, Thermoregulation and Excretion
      29601 views
      4.8: Organ and Organ System Involved in Homeostasis (Practice Test)
      Osmoregulation, Thermoregulation and Excretion
    1. Osmoregulation, Thermoregulation and Excretion
      29601 views
      2. Organs Involved in Homeostasis (Skin and Lungs)
    2. Organs Involved in Homeostasis (Skin and Lungs)
      5287 views
      3. Kidney as Osmoregulatory Organ
    3. Kidney as Osmoregulatory Organ
      12046 views
      4. Excretory Organs, Liver
    4. Excretory Organs, Liver
      8840 views
      4.9: Structure and Roles of Various Plant Organs in Plant Physiology (Practice Test)
      Systems of A Plant
    1. Systems of A Plant
      864 views
      2. Parts of a Flower
    2. Parts of a Flower
      1132 views

    Chapter 5 Metabolism (20 videos) (Practice Test) (Exercises Exercise Answers)

      5.1: Metabolism
      Metabolism
    1. Metabolism
      5.2: Enzyme and Their Characteristics (Practice Test)
      Characteristics of Enzymes
    1. Characteristics of Enzymes
      8195 views
      5.3: Mechanism of Enzyme Action (Practice Test)
      Mechanism of Enzymes
    1. Mechanism of Enzymes
      10316 views
      2. Lock and Key Model
    2. Lock and Key Model
      9839 views
      3. Induced Fit Model
    3. Induced Fit Model
      2579 views
      5.4: Factors Affecting the Rate of Enzyme (Practice Test)
      Factors Effecting the Rate of Enzyme Action
    1. Factors Effecting the Rate of Enzyme Action
      7365 views
      5.5: Competitive and Non-Competitive Inhibitors (Practice Test)
      Inhibitors
    1. Inhibitors
      9586 views
      5.6: Role of ATP as Energy Currency (Practice Test)
      Role of ATP as Energy Currency
    1. Role of ATP as Energy Currency
      11149 views
      5.7: Photosynthesis (Practice Test)
      More on Photosynthesis
    1. More on Photosynthesis
      1723 views
      2. Mechanism of Photosynthesis
    2. Mechanism of Photosynthesis
      3167 views
      3. More on Light Reaction
    3. More on Light Reaction
      5894 views
      4. Cyclic Phosphorylation
    4. Cyclic Phosphorylation
      15873 views
      5. Noncyclic Phosphorylation
    5. Noncyclic Phosphorylation
      24623 views
      6. More on Dark Reaction
    6. More on Dark Reaction
      4428 views
      5.8: Respiration (Practice Test)
      Respiration
    1. Respiration
      5542 views
      2. Anaerobic Respiration
    2. Anaerobic Respiration
      9665 views
      3. Aerobic Respiration
    3. Aerobic Respiration
      6500 views
      4. Mechanism of Respiration, Glycolysis
    4. Mechanism of Respiration, Glycolysis
      8440 views
      5. Oxidation of Pyruvic Acid and Krebs Cycle
    5. Oxidation of Pyruvic Acid and Krebs Cycle
      8792 views
      6. Components of Electron Transport Chain
    6. Components of Electron Transport Chain

    Chapter 6 Biodiversity and Classification (11 videos) (Practice Test) (Exercises Exercise Answers)

      6.1: Biodiversity and Classification
      Definition of Biodiversity
    1. Definition of Biodiversity
      6.2: Advantages of Classification (Practice Test)
      Aims and Basis of Classification
    1. Aims and Basis of Classification
      12075 views
      6.3: History of Classification Scheme (Practice Test)
      Aims and Basis of Classification
    1. Aims and Basis of Classification
      12075 views
      2. Two Kingdom Classification System
    2. Two Kingdom Classification System
      9650 views
      3. Three Kingdom Classification System
    3. Three Kingdom Classification System
      7821 views
      4. Five Kingdom System
    4. Five Kingdom System
      20175 views
      5. More on Five Kingdom Classification System
    5. More on Five Kingdom Classification System
      1829 views
      6.4: Three Distinct Domains of Organisms
      Three Domains System
    1. Three Domains System
      6.5: Taxonomic Ranks of Classification (Practice Test)
      Taxonomic Hierarchy
    1. Taxonomic Hierarchy
      13440 views
      6.6: Binomial Nomenclature (Practice Test)
      Binomial Nomenclature Significance and Examples
    1. Binomial Nomenclature Significance and Examples
      6877 views
      6.7: Complications of Classifying Viruses (Practice Test)
      Status of Viruses
    1. Status of Viruses
      9055 views

    Chapter 7 Forms and Functions in Plants (35 videos) (Practice Test) (Exercises Exercise Answers)

      7.1: Mineral Nutrition in Plants (Practice Test)
      Minerals Requirement in Plants
    1. Minerals Requirement in Plants
      3357 views
      7.2: Macronutrients and Micronutrients (Practice Test)
      Micronutrients and Macronutrients
    1. Micronutrients and Macronutrients
      7599 views
      7.3: Role of Nitrogen and Magnesium (Practice Test)
      Role of Nitrogen and Magnesium
    1. Role of Nitrogen and Magnesium
      5172 views
      7.4: Transport in Plants (Practice Test)
      Transport in Plants
    1. Transport in Plants
      5823 views
      7.5: Internal Structure of Root and Root Hair (Practice Test)
      Structure of Root
    1. Structure of Root
      2340 views
      7.6: Uptake of Water and Minerals through Roots (Practice Test)
      Uptake of water by Roots and Pathways
    1. Uptake of water by Roots and Pathways
      3614 views
      2. Passive Transport and Active Transport
    2. Passive Transport and Active Transport
      6121 views
      7.7: Transpiration (Practice Test)
      Transpiration
    1. Transpiration
      4807 views
      7.8: Factors Affecting the Rate of Transpiration (Practice Test)
      Factors Affecting the Rate of Transpiration
    1. Factors Affecting the Rate of Transpiration
      5640 views
      7.9: Mechanism of Transport of Water and Salts in Plants
      Water Movement in Xylem Through TACT Mechanism
    1. Water Movement in Xylem Through TACT Mechanism
      7.10: Translocation of Food in Plants
      Pattern or Direction of Translocation
    1. Pattern or Direction of Translocation
      7.11: Gaseous Exchange in Plants (Practice Test)
      Gaseous Exchange in Plants
    1. Gaseous Exchange in Plants
      16125 views
      7.12: Homeostasis and its Importance (Practice Test)
      Osmoregulation, Thermoregulation and Excretion
    1. Osmoregulation, Thermoregulation and Excretion
      29601 views
      2. Adaptations in Plants to High Temperature
    2. Adaptations in Plants to High Temperature
      1012 views
      7.13: Adaptations in Plants for Excretion (Practice Test)
      Excretion in Plants
    1. Excretion in Plants
      15550 views
      2. Latex, Resins and Gums
    2. Latex, Resins and Gums
      7.14: Osmotic Adjustments in Plants (Practice Test)
      Osmotic Adjustments in Plants
    1. Osmotic Adjustments in Plants
      13172 views
      7.15: Asexual Reproduction (Practice Test)
      Asexual Reproduction
    1. Asexual Reproduction
      1124 views
      2. Binary Fission
    2. Binary Fission
      9458 views
      3. Fragmentation, Budding
    3. Fragmentation, Budding
      6912 views
      4. Natural Methods of Asexual Reproduction
    4. Natural Methods of Asexual Reproduction
      4010 views
      5. Vegetative Propagation In Plants
    5. Vegetative Propagation In Plants
      230 views
      7.16: Difference between Natural and Artificial Propagation (Practice Test)
      Artificial Vegetative Propagation, Cutting, Grafting and Cloning
    1. Artificial Vegetative Propagation, Cutting, Grafting and Cloning
      4255 views
      2. Natural Vegetative Propagation
    2. Natural Vegetative Propagation
      2161 views
      7.17: Types of Vegetative Propagation (Practice Test)
      Natural Vegetative Propagation
    1. Natural Vegetative Propagation
      8829 views
      2. More on Natural Vegetative Propagation
    2. More on Natural Vegetative Propagation
      2352 views
      7.18: Artificial Vegetative Propagation (Practice Test)
      Artificial Vegetative Propagation, Cutting, Grafting and Cloning
    1. Artificial Vegetative Propagation, Cutting, Grafting and Cloning
      4255 views
      7.19: Parthenogenesis (Practice Test)
      Parthenocarpy
    1. Parthenocarpy
      16333 views
      7.20: Cloning (Practice Test)
      Tissue Culturing and Cloning
    1. Tissue Culturing and Cloning
      8030 views
      7.21: Sexual Reproduction in Plants (Practice Test)
      Sexual Reproduction in Flowering Plants, The Flower
    1. Sexual Reproduction in Flowering Plants, The Flower
      1046 views
      2. Life Cycle of an Angiospermic plant
    2. Life Cycle of an Angiospermic plant
      3006 views
      3. Pollination
    3. Pollination
      4691 views
      7.22: Seed Germination (Practice Test)
      Conditions Necessary for Seed Germination
    1. Conditions Necessary for Seed Germination
      4612 views
      7.23: Methods of Seed Dispersal (Practice Test)
      Dispersal of Seed and Fruits by Wind & Water
    1. Dispersal of Seed and Fruits by Wind & Water
      2419 views
      2. Dispersal of Seed and Fruits by Animals
    2. Dispersal of Seed and Fruits by Animals
      2760 views

    Chapter 8 Evolution (18 videos) (Practice Test) (Exercises Exercise Answers)

      8.1: Concept of Evolutionary Theories (Practice Test)
      Inheritance of Acquired Characteristics
    1. Inheritance of Acquired Characteristics
      5921 views
      2. Theory of Natural Selection
    2. Theory of Natural Selection
      11343 views
      3. Role of Gene Mutation & Chromosomal Mutation In Natural Selection
    3. Role of Gene Mutation & Chromosomal Mutation In Natural Selection
      1209 views
      8.2: Observations of Darwin during his Voyage (Practice Test)
      Variations lead to Evolution
    1. Variations lead to Evolution
      5196 views
      8.3: Evolution and Natural Selection (Practice Test)
      Role of Gene Mutation & Chromosomal Mutation In Natural Selection
    1. Role of Gene Mutation & Chromosomal Mutation In Natural Selection
      1209 views
      8.4: Theory of Evolution by Natural Selection (Practice Test)
      Alfred Russell Wallace
    1. Alfred Russell Wallace
      770 views
      2. More on Theory of Natural Selection
    2. More on Theory of Natural Selection
      2449 views
      3. More on Causes of Variation
    3. More on Causes of Variation
      4. Importance of Natural Selection As Possible Mechanism For Evolution
    4. Importance of Natural Selection As Possible Mechanism For Evolution
      8.5: Evidences of Evolution (Practice Test)
      Evidence From Biogeography and Paleontology
    1. Evidence From Biogeography and Paleontology
      2. Biogeography, The Fossil Record and Comparative Anatomy
    2. Biogeography, The Fossil Record and Comparative Anatomy
      5051 views
      3. Darwin's artificial selection as an experiment
    3. Darwin's artificial selection as an experiment
      383 views
      8.6: Sources of Variation that can Lead to Speciation (Practice Test)
      Variations lead to Evolution
    1. Variations lead to Evolution
      5196 views
      2. Darwin's artificial selection as an experiment
    2. Darwin's artificial selection as an experiment
      383 views
      3. Role of Gene Mutation & Chromosomal Mutation In Natural Selection
    3. Role of Gene Mutation & Chromosomal Mutation In Natural Selection
      1209 views
      8.7: Species (Practice Test)
      Species, Origin of Specie
    1. Species, Origin of Specie
      1676 views
      8.8: Speciation (Practice Test)
      Allopatric Speciation
    1. Allopatric Speciation
      1564 views
      2. Sympatric Speciation
    2. Sympatric Speciation
      2030 views