Biology | O-Levels
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- Growth
- Movement
- Sensitivity
- Excretion
- Respiration
- Reproduction
- Aims and Basis of Classification
- Binomial Nomenclature
- Characteristics of Fungi
- Characteristics of Fungi
- General Characteristics of Protists
- Structure of Bacteria Capsule, Slime and Pilli
- Viruses
- Structure of Viruses
- Class Pisces (Fishes)
- Class Amphibia
- Class Reptilia
- Class Aves
- Class Mammalia
- Phylum Arthropoda
- More on Phylum Arthropoda
- Classification of Arthropods
- General Characteristics of Plants
- Classification of Plantae
- Plant Body of Angiosperms
Chapter 1 Classification ( 26 videos) (Practice Test)
1.1: Characteristics of Living Things
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1.2: Classification (Practice Test)
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1.3: The Kingdoms of Living Organisms (Practice Test)
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1.4: Viruses (Practice Test)
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1.5: Classifying Animals (Practice Test)
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1.6: Classifying Plants (Practice Test)
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- Cell
- Light Microscope
- Electron Microscope
- Cell Membrane
- Cell wall
- Cytoplasm, Cytoskeleton
- More on Cytoplasm, Cell Organelles
- Vacuoles
- Chloroplasts, The Sites of Photosynthesis
- Nucleus
- More on Nucleus
- Mitochondria
- Mitochondria Convert Energy
- Ribosomes
- Organelle, Cell and Tissue Level
- Organ and Organ System Level
- Levels of Organization
Chapter 2 Cells ( 19 videos) (Practice Test)
2.1: Cell Structure (Practice Test)
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2.2: Cells and Organisms (Practice Test)
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- Diffusion and Facilitated Diffusion
- Osmosis
- Water Balance Problems
- Passive Transport and Active Transport
Chapter 3 Movement In and Out of Cells ( 4 videos) (Practice Test)
3.1: Diffusion
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3.2: Osmosis (Practice Test)
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3.3: Active Transport
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- Carbohydrates
- Monosaccharides
- Polysaccharides
- Functions of Carbohydrates
- Lipids Characteristics
- Uses of Lipids
- Structure of Amino Acid
- Peptide Linkage
- Structure of Protein
- More on Structure of Protein
- Functions of Protein
- Watson-Crick Model of DNA
Chapter 4 The Chemicals of Life ( 13 videos) (Practice Test)
4.1: What are you made of?
4.2: Carbohydrates (Practice Test)
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4.3: Fats
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4.4: Proteins (Practice Test)
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4.5: DNA (Practice Test)
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- Characteristics of Enzymes
- Factors Affecting the Rate of Enzyme Action
Chapter 5 Enzymes ( 5 videos) (Practice Test)
5.1: Biological Catalysts (Practice Test)
5.2: Properties of Enzymes (Practice Test)
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- Autotrophic and Heterotrophic Nutrition
- Minerals Requirement in Plants
- Photosynthesis
- Role of Chlorophyll and Light
- Ultrastructure of Plant Cell
- Structure of Leaf
- Internal Structure of Leaf
- Uses of Carbohydrates
- Starch
- Limiting Factors in Photosynthesis
- Photosynthesis
Chapter 6 Plant Nutrition ( 11 videos) (Practice Test)
6.1: Types of Nutrition (Practice Test)
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6.2: Photosynthesis (Practice Test)
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6.3: Leaves (Practice Test)
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6.4: Uses of Glucose
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6.5: Testing Leaves for Starch (Practice Test)
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6.6: Limiting Factors
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6.7: The Importance of Photosynthesis
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- Need for Food
- Nutrition in man
- Water and Dietary Fiber
- Vitamin A
- Minerals
- Fatty Acids to Lipids
- Obesity, Anorexia Nervosa
- Protein - Energy Malnutrition
- Effects of Malnutrition
- Digestion in Human
- Types of Digestion
- Teeth
- Types of Teeth
- Human Alimentary Canal
- Digestion in Oral Cavity
- Digestion in Pharynx and Oesophagus
- Digestion in Stomach
- Digestion in Small Intestine
- Absorption of Protein in Small Intestine
- Digestion in Large Intestine
- Diarrhoea and Vomiting
- Ingestion and Digestion of Food in Man
Chapter 7 Animal Nutrition ( 25 videos) (Practice Test)
7.1: Diet (Practice Test)
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7.2: Digestion (Practice Test)
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7.3: Teeth (Practice Test)
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7.4: The Alimentary Canal (Practice Test)
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7.5: Assimilation (Practice Test)
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- Transport in Plants
- Xylem Tissues
- Vascular Plants - Successful Land Plants
- Water in Plants
- Transpiration
- Water Potentials
- Factors Affecting the Rate of Transpiration
Chapter 8 Transport in Plants ( 14 videos) (Practice Test)
8.1: Plant Transport System (Practice Test)
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8.2: Water Uptake (Practice Test)
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8.3: Transpiration (Practice Test)
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8.4: Transport of Manufactured Food (Practice Test)
- Double Circuit Circulation
- Single Circuit Circulation
- Human Heart
- Structure of Human Heart
- More on Structure of Human Heart
- More on Structure of Human Heart
- Circulation of Blood Inside Heart
- Coronary Circulation
- Treatment of Cardiovascular Diseases
- Angioplasty
- Heartbeat
- Valves of Heart
- More on Valves of Heart
- Transportation in Man
- Blood Cells
- White Blood Cells and Platelets
- Platelets
- Functions of Blood
- More on Functions of Blood
- Tissue Fluid, Lymphatic System
- Lymphatic System of Man
- Lymph Nodes
- Position of Lymph Nodes
Chapter 9 Transport in Animals ( 27 videos) (Practice Test)
9.1: Circulatory Systems (Practice Test)
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9.2: The Heart (Practice Test)
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9.3: Blood Vessels (Practice Test)
9.4: Blood (Practice Test)
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9.5: Lymph and Tissue Fluid (Practice Test)
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- Viral Diseases
- Bacterial Diseases in Man
- First Line of Defence
- Chemical Components of the Skin's Defense
- Cilia and Mucus
- Sewage Treatment
- Structure Model of Antibodies
- Role of Memory Cell in Immunity
- Immunization and Vaccination
- Types of Immunity, Active Immunity
- Passive Immunity
- Autoimmune Disorders
Chapter 10 Pathogens and Immunity ( 15 videos) (Practice Test)
10.1: Pathogen (Practice Test)
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10.2: Body Defences (Practice Test)
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10.3: The Immune System (Practice Test)
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- Need of Respiratory Gas Exchange
- Properties of Respiratory Surfaces
- Parts of Respiratory System
- The Air Passageway
- Upper Respiratory Tract (Nose)
- Pharynx
- Lower Respiratory Tract (Larynx and Trachea)
- Bronchi and Bronchioles
- Mechanism of Breathing
- Inspiration (Inhalation)
- Expiration
- Rate of Breathing
Chapter 11 Respiration and Gas Exchange ( 16 videos) (Practice Test)
11.1: Respiration (Practice Test)
11.2: Gas Exchange in Human (Practice Test)
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11.3: Breathing Movements (Practice Test)
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- Excretion in Animals
- Structure of Kidney
- Nephron
- Function of Kidney
- Urea Formation, Kidney Filtration
- Renal Failure
- Peritoneal Dialysis
- Treatment of Malfunctioned Kidneys
Chapter 12 Excretion ( 11 videos) (Practice Test)
12.1: Excretory Products (Practice Test)
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12.2: Nitrogenous Waste (Practice Test)
12.3: The Human Excretory System (Practice Test)
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- Coordinated Action, Stimuli, Receptors
- Steps Involved in Coordination
- Nerve cell or Neuron
- Components of Nervous System, Brain
- Reflex Action
- Synapse
Chapter 13 Coordination and Response ( 16 videos) (Practice Test)
13.1: Coordination in Animals (Practice Test)
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13.2: The Human Nervous System (Practice Test)
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13.3: Receptors (Practice Test)
13.4: The Endocrine System (Practice Test)
13.5: Coordination and Response in Plants (Practice Test)
- Homeostasis
- The Structure and Role of Skin
- Chemical Components of the Skin's Defense
- Concept of Feedback
- Feedback Mechanism
- Diabetes Mellitus and Its Genetic Basis
Chapter 14 Homeostasis ( 10 videos) (Practice Test)
14.1: Maintaining the Internal Environmnet (Practice Test)
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14.2: Control of Body Temperature (Practice Test)
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14.3: Control of Blood Glucose Concentration (Practice Test)
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- Drug, Pharmaceutical Drug, Addictive Drugs
- Narcotics, Heroin, Cocaine
- Nicotine and Alcohol
- Bad effect of Smoking
- Lung Cancer
Chapter 15 Drugs ( 6 videos) (Practice Test)
15.1: What is a Drug? (Practice Test)
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15.2: Medicinal Drugs
15.3: Misuse of Drugs (Practice Test)
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15.4: Tobacco Smoking (Practice Test)
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- Reproduction, Asexual and Sexual reproduction
- Reproductive Parts, Flower
- Structure of Ovules
- Structure of Pollen Grain
- Pollination
- Dispersal of Seed and Fruits by Wind & Water
- Dispersal of Seed and Fruits by Animals
- Formation of Seed And Fruit
- Development and Structure of Seed
- Germination of Seed
Chapter 16 Reproduction in Plants ( 16 videos) (Practice Test)
16.1: Asexual Reproduction (Practice Test)
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16.2: Sexual Reproduction (Practice Test)
16.3: Sexual Reproduction in Flowering Plant (Practice Test)
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16.4: Comparing Sexual and Asexual Reproduction (Practice Test)
- Female Reproductive System
- Male Reproductive System
- Function of Female Reproductive System
- Function of Male Reproductive System
- Menstrual Cycle
- Hormonal Control of Reproductive Cycles
- AIDS, A Sexually Transmitted Disease
Chapter 17 Reproduction In Human ( 12 videos) (Practice Test)
17.1: Human Reproductive Organs (Practice Test)
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17.2: Menstrual Cycle (Practice Test)
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17.3: Sexually Transmitted Infections (Practice Test)
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- Chromosomes, Nucleolus
- Mitosis, Prophase
- Anaphase, Telophase of Mitosis
- More on Mitosis, Cytokinesis
- Meiosis-I, Prophase I
- Meiosis I (Prophase I)
- Metaphase I, Anaphase I and Telophase I
- What is a Gene?
- Genes, Locus, Alleles, Phenotype, Genotype
- Codominance
- Punnet Square, Test Cross
- Sex Linkage
- Sex-Linkage in Human
- Genetic Code
- Translation
Chapter 18 Inheritance ( 17 videos) (Practice Test)
18.1: Chromosomes (Practice Test)
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18.2: Cell Division (Practice Test)
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18.3: Inheritance (Practice Test)
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18.4: DNA and Protein Synthesis (Practice Test)
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- Xerophytes and Mesophytes
- Hydrophytes and Halophytes
- Variations lead to Evolution
- More on Theory of Natural Selection
- Theory of Natural Selection
- Sickle Cell Aneamia, Diabetes Mellitus
Chapter 19 Variation and Natural Selection ( 11 videos) (Practice Test)
19.1: Variation (Practice Test)
19.2: Adaptive Features (Practice Test)
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19.3: Selection (Practice Test)
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- Ecology
- Food Chain
- Food Web
- Types of Consumers
- Herbivores, Carnivores, Omnivores
- Ecological Pyramids of Number
- Ecological Pyramids of Biomass
- Pyramids of Energy
- Need of Population Planning
Chapter 20 Organisms and Their Environment ( 14 videos) (Practice Test)
20.1: Ecology (Practice Test)
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20.2: Energy Flow (Practice Test)
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20.3: Nutrient Cycle (Practice Test)
20.4: Population Size
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- Scope and Importance of Biotechnology
- Uses of Enzymes
- Antibiotics
- Agaricus, Penicillium and Ustilago
- Biotechnology, The Genetic Engineering
- Using Bacteria in Genetic Engineering
- Molecular Carrier: Vector
Chapter 21 Biotechnology ( 10 videos) (Practice Test)
21.1: What is Biotechnology (Practice Test)
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21.2: Using Yeast
21.3: Making Use of Enzymes
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21.4: Penicillin (Practice Test)
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21.5: Genetic Engineering (Practice Test)
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- Artificial Selection
- Deforestation, Soil Erosion
- Green House Effect
- Global Warming
- Effect of Global Warming
- Acid Rain
- Mechanism of Acid Rain
- Effect of Acid Rain
- Conservation of Biodiversity
- Biological Principles of Sewage Treatment
- Conservation of Wildlife
- Endangered Species
Chapter 22 Humans And the Environment ( 17 videos) (Practice Test)
22.1: Food Production (Practice Test)
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22.2: Habitat Destruction (Practice Test)
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22.3: Pollution (Practice Test)
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22.4: Conservation (Practice Test)
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