Important Concepts
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Important Concepts: Maths, Physics, Chemistry & Biology
Your one-stop guide to all formulas, theorems, laws, definitions, and key topics—sorted by subject. Ideal for last-minute revision, board exams, entrance tests, and Olympiad prep. Each section is hand-curated by Hodu Academy experts to help you master your concepts quickly.
Complete Maths Important Concepts & Formulae List
Laws, definitions, formulae, derivations, practicals & more—organized for exam-time efficiency.
| Additive and Multiplicative Identity | Adjacent and Vertical Angles | Algebra Symbols | Area Of Hemisphere | Area Of Hollow Cylinder |
| Area of Pentagon | Area of Rectangle | Bodmas Rule | Branches of Mathematics | Chance and Probability |
| Circumference of a Circle | Congruence Of Triangles | Construction of Angles | Cuboid and Cube | Decimals In Daily Life |
| Divisibility Rules | Dot Product of Two Vectors | Empirical Probability | Equivalent Fractions | Even Odd Prime Composite Numbers |
| Frequency Polygons | Geometric Tools | Integers | Lines | Maths Project |
| Number System | Numeral System | Odd Numbers | Perfect Cube Of Numbers | Perfect Numbers |
| Perpendicular Bisector | Precision | Prime Factorization of Hcf And Lcm | Prime Numbers | Probability and Statistics Symbols |
| Quadrilateral | Reflection Symmetry | Roman Numerals | Set Theory Symbols | Surface Area and Volume |
| Three Dimensional Shapes | Triangular Numbers | Trigonometry | Trigonometry Table | Two Lines Symmetry |
| Types of Angles | Value of Pi | Variables And Constants In Algebraic Expressions | Z Score Table | Addition Table |
| Algebraic Expression | Algebraic Identities | Apollonius Theorem | Applications of Trigonometry | Area of a Sphere |
| Area of Equilateral Triangle | Area of Isosceles Triangle | Area of Quadrilateral | Area of Trapezium | Area of Triangle |
| Area Segment Circle | Ascending Order | Average and Mean | Basic Proportionality Theorem | Bisection Method |
| Centroid | Circumcenter of a Triangle | Cm to inch converter | Co-Prime Numbers | Compound Interest |
| Coordinate Geometry | Correlation | Cos 30 Degrees | Cube | Cylinder |
| Difference Between Fraction And Rational Numbers | Difference Between Percentage and Percentile | Differential Equations | Differentiation Formulas | Even Numbers |
| Factorisation | Frequency Distribution Table Statistics | Graphical Representation | HCF and LCM | Height and Distance |
| Horizontal Line | How to Find the Percentage of Marks? | Math Tricks | Maths Equations | Mensuration |
| Obtuse Angled Triangle | Odd Numbers | Onto Function | Pentagon | Pentagonal Prism |
| Perimeter of Square | Perimeter of Triangle | Probability | Profit and Loss | Properties of a Triangle |
| Properties of Isosceles Triangle | Rational Numbers | Rational Numbers and Their Properties | Real Number | Relation between Mean, Median and Mode |
| Rhombus | Rotation | Semicircle | Sin 30 Degrees | Solving Linear Equations |
| Square Root | Statistics | Supplementary Angles | Surface Area of a Hemisphere | Surface Area of a Sphere |
| Surface Areas and Volume | Symmetric and Skew Symmetric Matrix | Tables of 2 to 30 | The volume of a Cylinder | Trapezium |
| Triangular Prism | Trigonometric Ratios | Types of Triangles | Types of Vectors | Value of Log Infinity |
| Value of Root 3 | Value of Root 5 | Vertical Line | Volume of a Cube | Volume of Hemisphere |
| Whole numbers | Algebraic Identities | Differentiation and Integration | Greater Than and Less Than Symbols | Laplace Transform |
| Linear Graph | Trigonometric Ratios | Orthocenter | Orthogonal Matrix | Square Root from 1 to 25 |
| Log 0 Value | Altitude of a Triangle | Binary Subtraction | Cayley Hamilton Theorem | Diagonal Matrix |
| Difference Between Constants and Variables | Difference Between Linear and Nonlinear Equations | Geometric Progression Sum of GP | Like Fractions Unlike Fractions | Difference between Place Value and Face Value |
| Sin 60 Degrees | Singular Matrix | Value of Cos 120 | Antilog Table | Consistent And Inconsistent Systems |
| Cube Root of Unity | Direct and Inverse Proportion | Euclid Division Lemma | Extrapolation | Frustum of Cone |
| Greater Than Symbol | Elementary Transformation of Matrix | Integration | Limits and Derivatives | Methods of Integration |
| Polynomial | Rational Numbers Between Two Rational Numbers | Relations and Functions | Relation and Its Types | Right Circular Cone |
| Sequence and Series | Square Root Of 4 | Square Root Of 5 | Square Root Of 7 | Statements in Mathematical Reasoning |
| Trapezoids | Binary Multiplication | Definite Integral | Square Root of 1 | Value of sin 15 |
| Continuity and Differentiability | Axiomatic Definition of Probability | Area Of Quadrant | Rectangle | Operations on Rational Numbers |
| Pascals Triangle | Acute Angled Triangle | Angle of Elevation | Angle Sum Property of a Triangle | Tables of 2 to 30 |
| The volume of a Cylinder | Trapezium | Area of a Scalene Triangle | Centroid of a Triangle | Heptagon |
| Octagon | Permutation and Combination | Scalene Triangle | Similar Triangles | Surface Area of Cube |
| Surface Area of Cylinder | Volume of Cone | Volume of Cuboid | Value of Log 1 | Decimal Number System |
| Conversion of Units | What is Proper Fraction? | Rolle's Theorem | Vertical Angles | Trigonometry Values |
| Sec 0 | Greatest Integer Function | Mean Deviation & Frequency Distribution | Concentric Circles | Symmetry |
| Variance | Laws of Exponents | Length of Tangent | Alternative Hypothesis | Control Charts |
| Straight Angle | LCM Of Two Numbers | Bivariate Analysis | Surds | Square Root of 10 |
| Cos 90 Value | Prime Numbers and Composite Numbers | Decimal to Binary | Difference Between Square & Rhombus | Symmetric Matrix |
| Relation Between Inch and cm | Sin 45 Value | Divisibility Rules For 13 | Profit and Loss Percentage | Linear Pair Of Angles |
| Line Segment | Rational and Irrational Numbers | Euclid Geometry | Sec 30 | Complimentary and Suplementary Angles |
| Square root and Cube Root | LCM | Nature of Roots of a Quadratic Equation | Vertices, Faces and Edges | Quadrilateral Angle Sum Property |
| Geometry Symbols | Isosceles Triangle | Numbers in Words | Angle Between Two Planes | Complex Numbers |
| Addition and Subtraction of Integers | Natural Numbers and Whole Numbers | Is 91 a Prime Number? | Difference Between Cube and Cuboid | Distributive Property |
| Difference Between Rhombus and Parallelogram | Skip Counting | Trigonometry Functions of Sum and Difference of Angles | Logarithm Table | Vector And Scalar Quantities |
| Data Organization | PEMDAS | Secant of a Circle | Vector Space | Angle Bisector Theorem |
| Mutually Exclusive Events | Statistical Inference | Difference Between Area and Volume | How to Find Prime Numbers? | 3D Shapes |
| Division of Line Segment | Binary Addition | Ordinate | Line Graph | Boolean Algebra |
| Latus Rectum of Conic Section | Differential Equation And It's Types | Involute | Similarity of Triangles | Simple Equations Application |
| Types of Polygon | Equation of A Circle | Law of Tangents | Data Sets | Binary to Octal Conversion |
| Rational Numbers on a Number Line | Cross Section | Construction of Triangle | Circles | Factors of 36 |
| Probability Distribution | Difference Between Parametric and Non-Parametric Test | Number Patterns Whole Numbers | Parts of Circle | Square Root of 9 |
| Parallel Lines | Oblique Sketch | Direct Proportion | Cosine Rules | Construction of Quadrilaterals |
| Right Circular Cylinder | Hexadecimal number system | Remainder Theorem | Volume of a Prism | Missing Numbers |
| Sec 90 | Derivatives | Multiple of 9 | Metric System of Measurement | Parallelogram, Trapezium and Kite |
| Cumulative Frequency Distribution | Ratio to Percentage | Factors of 98 | Total Probability Theorem | Commutative Property |
| Basic Set Theory | Difference Between Area and Surface Area | Identity Function | Geometric Distribution | Combination |
| Sum of Squares | Factors of 25 | Triangle Inequality | Complement of a Set | Factor of 105 |
| Arc | Categorical Data | Construction of a Rhombus | Hexadecimal to Octal Conversion | Decimal Expansion of Rational Numbers |
| Distance Between Two Points | Estimation of Numbers | Multiplication Theorem of Probability | Properties of Definite Integrals | Right Angle Triangle Theorem |
| Section Formula in 3 Dimension | Solids | Trigonometric Equations | Variance and Standard Deviation | Disjoint Set |
| Application of Linear Equations | Area and Perimeter | Factors of 91 | Concave Polygon | Factors of 42 |
| General Equation of a Line | Factors of 100 | Factors of a Number | Multiplicative Inverse | Linear Differential Equations |
| Inverse Cosine | Fractional Part Function | Definition of Signum function | Trigonometric Functions |
Physics Important Concepts & Formulae List
Laws, definitions, formulae, derivations, practicals & more—organized for exam-time efficiency.
| Accuracy Precision and Error in Measurement | Ampere | Amplitude Modulation | Anemometer : Measurement of Wind Speed | Angular Acceleration |
| Atomic Theory | Audible and Inaudible Sound | Average Speed and Average Velocity | Average Velocity | Avogadros Number |
| Avogadros Hypothesis | Azimuthal Quantum Number | Balanced Force | Bar Magnet | Biconvex Lens |
| Boyles Law | Buoyancy | Calorimeter | Carnot Engine | Celestial Bodies |
| Centripetal And Centrifugal Force | Concave and Convex Lenses | Concave Convex Mirrors | Contact and Non Contact Force | Controlled Thermonuclear Fusion |
| Convection Currents | Convex Lens | Convex Mirror | Destructive Interference | Difference Between Conduction Convection and Radiation |
| Difference Between Electric Field and Magnetic Field | Difference Between Heat And Temperature | Difference Between Series And Parallel Circuits | Differences Between Acceleration And Velocity | Distance and Displacement |
| Distance Time Graph | Electrical Force : Electric Forces and Their Types | Electromagnetic Waves : Definition, Equation and Properties of Electromagnetic Waves | Electromagnetism | Electron Spin |
| Fluid Flow : Bernoullis Equation Derivation and Fluid Mechanics | Fluid Friction : Types and Factors of Fluid Friction | Frames of Reference : Inertial and Non- Inertial Frame of Reference | Frequency and Wavelength | Frictional Force |
| Importance of Hydrosphere | Instantaneous Speed and Velocity | Introduction to Motion | Kinetic and Potential Energy Difference | Law Of Conservation of Energy |
| Layers of the Earth | Light Energy | Light Sources | List of physics scientists and Their inventions | Loudness of Sound |
| Magnetic Dipole Moment | Magnetic Field | Non - Contact Force | Non - Renewable Energy | Ohms Law |
| Optics | P Wave | Physics Symbols | Plane Mirrors | Poissons Ratio |
| Projectile Motion | Properties of Water : Anomalous Expansion of Water | Radius of Gyration | Reflection of Light | Reflection of Waves |
| Relative Density | Resonance | Reverberation | Rolling Friction | Rotation and Revolution |
| Screw Gauge | Semiconductors and Insulators | Sliding Friction | Speed Time Graphs | Static Friction |
| Stefan Boltzmann Law | Stress | Tension | Tension Force | Thermometer: Clinical Laboratory Thermometer |
| Types of Rocks | Types of Waves | Uniform Motion and Non Uniform Motion | Unit of Voltage | Uses of Convex Lens |
| Uses Of Convex Mirror | Uses of Electromagnet | Uses of Optical Fibre | Wave | Wavelength of Light |
| What is Scattering of Light | Working of Electric Bell | Conventional and Non-conventional Sources of Energy | Buoyant Force | Bulk Modulus of Elasticity |
| Bernoulli’s Principle | Angular Momentum | Difference Between Speed And Velocity | Force | Unit of Heat |
| Difference between Distance and Displacement | Simple Microscope | Derivation Of Equation Of Motion | Thermometer: Clinical & Laboratory Thermometer | Difference between Concave and Convex Lens |
| Derivation Of Lens Maker Formula | Unit Of Pressure | Velocity | Uses of Plane Mirror | Wave Theory of Light |
| Unit of Density | Unit of Light | Unit of Force | Unit of Magnetic Field | Unit of wavelength |
| Unit of Viscosity | Uses of Electroplating | Young's Modulus | What is the Scattering of Light | Lenz Law |
| Space Wave Propagation | Schrodinger Wave Equation | Relation between Fahrenheit and Celsius | Refractive Index | Potentiometer Working |
| Pascal Law | Oscillatory Motion | Optical Instruments | Newton's Laws of Motion - First Law | Modulation and Demodulation |
| Magnetic Flux | Lens Formula and Magnification | Kaleidoscope | Faradays Law | Epsilon Naught Value |
| Energy Bands | Electrostatics | Electroscope | AC Generator | Unit of Current |
| Lithosphere | Bending Equation Derivation | Difference Between Pound and Kilogram | Semiconductor Devices | OTEC - Ocean Thermal Energy Conversion |
| Hall Effect | Rectilinear Propagation of Light | Difference Between Ammeter and Voltmeter | Coefficient of Linear Expansion | Ampere’s Law |
| Cyclone and Thunderstorm | Save The Environment From Pollution | Particle Nature of Light | Types of DC Motor | Uses Of Transistor |
| Derivation of Phase Rule | Unit of Humidity | Difference between Land Breeze and Sea Breeze | Relation Between Critical Angle And Refractive Index | Derivation of Escape Velocity |
| Unit of Speed | Elastic Collision | Linear Velocity | Reversible and Irreversible Processes | Relation Between Density And Volume |
| Relation Between Group Velocity And Phase Velocity | Thermal Stress | Mirrors | Conversion of Units | Modulation |
| Unit of Weight | Stokes Law Derivation | Kirchhoff’s Second Law | Zener Diode as a Voltage Regulator | Quark |
| Difference Between Discovery and Invention | Nuclear Fission | Ultrasound | Principle Of Calorimetry | Differences Between Magma and Lava |
| Types Of Wind | Difference Between Work and Energy | Schottky Diode | Kinetic Theory Of Gases | Thermal Properties of Materials |
| Relation Between Kinetic Energy And Momentum | Work Done By A Variable Force | Solenoid and Toroid | Difference between Light Microscope and Electron Microscope | Doppler Effect Derivation |
| Determine Refractive Index of a Glass Slab using a Travelling Microscope | Relation between Torque and Speed | Current Density | Electric Displacement | Impending Motion |
| Latent Heat of Water | Infrared Radiation | Vector Product Of Two Vectors | Alpha Decay1 | Centripetal Acceleration |
| Newton's Third Law Of Motion | Biogas Energy | Tracing the Path of a Ray of Light Passing Through a Rectangular Glass Slab | Unit of Conductivity | Pulley |
| Resistor | LCR Circuit | Difference Between Force and Pressure | Viscosity | Einstein's Explanationx |
| Sea Breeze and Land Breeze | Types of Lever | Permeability | Adiabatic Process | Fleming's Left Hand Rule And Right Hand Rule |
| Spherical Mirrors | Heat Transfer By Convection | Stress and Strain | Displacement Current | Unit of Electric Field |
| Electromagnetic Induction | Diode | Critical Velocity | Carbon Resistor | Electric Charge |
| Derivation of Continuity Equation | Mach Number | Coherent Sources | Rigid Bodies | Resolving Power of a Microscope and Telescope |
| Angular Displacement | Unit of Momentum | Chandrasekhar Limit | Difference Between Real Image and Virtual Image | Electromagnets |
| Viscosity | Einstein's Explanationx | Sea Breeze and Land Breeze | Kinetic Energy | Van De Graaff Generator |
| Derivation of Kinetic Energy Formula | Kinetics and Kinematics | Frequency, Time period and Angular frequency | Unit of Torque | Capacitance |
| Difference Between AM and FM | Boltzmann’s Constant | Planck’s Constant | Laws of Reflection | Drift Velocity |
| Malthusian Theory of Population | Stars Planets and their Difference | Tensile Stress | Joule-Thomson Effect | Stefan Boltzmann Constant |
| Compressive Stress | Wave Function | Difference Between Density and Specific Gravity | Energy Stored in a Capacitor | Determine Radius of Curvature of a Given Spherical Surface by a Spherometer |
| Uniformly Accelerated Motion | Conservative Force | Biot Savart Law | Deuteron Mass | Power |
| Power of a Lens | Refraction and Dispersion of Light | Sphygmomanometer | Uniform Circular Motion | Unit of Distance |
| Unit of Energy | Uses of Rectifier | Unit of Inductance | Law Equipartition Energy | Periodic Motion |
| Determination of Focal Length of Concave Mirror and Convex Mirror | Optical Density | Characteristics of a Transistor | Scintifllation Counter | Difference Between Earthing And Grounding |
| White Light | Optical Fiber | Relative Speed | Unit of Work | Coefficient of Viscosity |
| Neutrons, Isotopes, Isotones And Isobars | Electric Circuit | Difference Between Scalar and Vector | Difference Between Two Stroke and Four Stroke Engines | Unit of Velocity |
| Zener Diode | Gamma Rays - Electromagnetic Spectrum | Permittivity and Permeability | Tidal Energy | Difference Between Resistance and Resistivity |
| Uses of Vernier Calipers | Human Eye Function | Shearing Stress | Value of Gravitational Constant | Value of Electron |
| Difference Between LCD and LED | Pinhole Camera | Single Slit Diffraction | Difference Between Circuit Switching and Packet Switching | Wheatstone Bridge |
| Unit of Resistance | Banking of Roads | Scalar and vector | Density of Water | Cyclotron |
| Unit of Specific Resistance | Types of Cables | Modern Physics | Uses of Concave Mirror | Magnetic Moment |
| Law of Conservation of Momentum Derivation | Magnet | Rectilinear Motion of Particles | Difference Between Mass and Weight | Archimedes Principle |
| Refraction of Light | Types of Motors | Types of Gears | Solar Energy and Photovoltaic Cell | Escape Velocity and Orbital velocity |
| Natural Sources of Energy | Difference Between Frequency Modulation and Amplitude Modulation | Fick’s Law of Diffusion | Faraday Electromagnetic Induction Experiment | Prism Dispersion |
| Continuous Charge Distribution | Capacitor Types | Geothermal Energy | Force and Momentum | Resistors in Series and Parallel Configuration |
| Work and Power | Raman Effect | Difference Between Asteroid and Comet | Thermal Energy Storage | Types of Connectors |
| Hydroelectricity and Hydropower Plant | Conduction of Electricity in Liquids | Linear Accelerator | Maxwell's Relations | AC Voltage Resistor |
| Law of Conservation of Charge | Kinetic Theory of Gases Assumptions | Reflection of Light Image | Centre of mass of continuous mass distribution |
Chemistry Important Concepts & Formulae List
Laws, definitions, formulae, derivations, practicals & more—organized for exam-time efficiency.
| 118 Elements and Their Symbols and Atomic Numbers | Acetone | Acid And Base Difference | Acids Bases and Salts | Actinides |
| Addition Reaction | Adsorption Chromatography | Aldol Condensation | Alkali Metals | Ammonium Chloride |
| Applications of Redox Reactions | Argon | Arrhenius Equation Rate Constant And Temperature | Atomic Number Mass Number | Aufbau Principle |
| Aufbau Principle, Paulis Exclusion Principle and Hands Rule | Bakelite: Structure and Uses | Benzene Reactions | Benzoic Acid - Structure and Properties | Biodegradable and Non Biodegradable |
| Calcium Oxide | Cathode Ray Experiment | Charles Law | Chemical And Its Composition | Chemical Formula of Common Compounds |
| Classification Of Carbohydrates and Its Structure | Classification of Organic Compounds | Coefficient of Viscosity - Definition, Formula and Example | Colligative Properties beRelative Lowering of Vapour Pressure | Colloidal Solution |
| Components of Air | Condensation | Conformation | Cracking Meaning | Crystallization |
| Decantation | Decomposition Reaction | Dehydration of Alcohols | Difference Between Alkali and Base | Difference Between Atom And Ion |
| Difference Between Atom and Molecule | Difference Between CNG and LPG | Difference between Compound and Mixture | Difference Between Element And Compound | Difference Between Exothermic and Endothermic Reactions |
| Difference Between Mixture and Solution | Difference Between Molecule and Compounds | Difference Between Organic And Inorganic Compounds | Difference between Physical and Chemical Change | Difference between Vapor and Gas |
| Disaccharides | Discovery of Protons and Neutrons | Distillation | Effects of Burning Fossil Fuels | Electromeric Effect |
| Electron Configuration | Electronic Configuration of First 30 Elements | Electronic Configuration of Iron | Electroplating Process | Endothermic Reaction |
| Enthalpy Change | Enzyme Catalysis | Ester | Ester Hydrolysis | Ethanoic Acid |
| Exothermic Reaction | Filtration | Fuel Types | Functions of Nucleic Acids | Glycerin |
| Glycine Structure | Glycogen | Gravimetric Analysis | Group 17 Trends Properties | Heat Capacity Cp Cv Relation |
| Heavy Water | Homogeneous Mixture and Heterogeneous Mixture | Hunds Rule | Hybridization | Hydrochloric Acid |
| Hydrogen Peroxide | Introduction: Importance of Forest | IR Spectroscopy | Iron | Krypton |
| Lewis Dot Structures | Metallic Bonds | Metals and Nonmetals | Methanol | Mineral Resources |
| Mixtures | Modern Periodic Table and Its Significance | Mole Concept | Monosaccharides | NaHCO3 |
| Natural Polymers | Neutralization Reaction | Non Metals | Oxalic Acid | Oxygen |
| Periodic Table Elements | Periodic Trends in Properties of Elements | Pesticides | Phenol Preparation | Phosphoric Acid |
| Physical and Chemical Properties of Carbon | Physical And Chemical Properties of Water | Physical Change and Chemical Change | Polarity | Polymers Uses |
| Polyvinyl Alcohol | Positron | Potassium | Potassium Dichromate - Formula, Properties and Uses | Potassium Permanganate |
| Precipitation Reaction | Preparation of Benzene | Preparation Properties and uses of Sodium Chloride | Properties of Boron Family | Properties of Solution |
| Redox Titration | Relation Between Normality And Molarity | Rusting Iron Prevention | Rutherford Atomic Model | Rutherford Atomic Model |
| Shapes of Molecules Vsepr Theory | Shapes of Orbitals | Sieving | SilkWorm - Life Cycle of Silkworm, Diagram | Silver Nitrate |
| Soaps And Detergents | Sodium Hydroxide | Structure of Benzene | Sublimation | Synthetic Fibres And Natural Fibres |
| Synthetic Polymers | Tollens Test | Toluene | Transition Metals | Tyndall Effect |
| Types of Organic Reactions | Types of Solutions | Types of Titration - Acid Base Titration | Unsaturated Solutions | Ununoctium |
| Ununpentium | Uses of Acetone | Uses of Air | Uses of Bauxite | Uses of Carboxylic Acid |
| Uses of Coal | Uses of Ethers Health In Care Industry | Uses of Formaldehyde | Uses of Graphite | Uses of Methanol and Ethanol |
| Uses of Minerals | Uses Of Nitric Acid | Uses of Phenol | Uses of Propanol | Uses of Sulfuric Acid |
| Uses of Water | Valence Bond Theory | Volumetric Analysis | Waste | Water Cycle Process |
| What is Dipole Moment? | What is Eutrophication? | What is Metallurgy? | Wurtz Reaction | Mohr’s Salt Titration with KMnO4 |
| Gattermann Reaction | Benzene | Brown Ring Test | Calcium Carbonate | Cotton and its Various Uses |
| Difference between Petrol and Diesel Engine | Difference between Sigma and Pi Bond | Element-Manganese (Mn) | Friedel Crafts Reaction | Hofmann Elimination |
| Isomerism | Laws of Chemical Combination | Mannich Reaction | Methods of separation | Molisch’s Test |
| Name Reactions | NMR Spectroscopy | Non – Aqueous Titration | Ozonolysis Mechanism – Ozonolysis of Alkenes and Alkynes | Periodic Classification of Elements |
| Pinacol Pinacolone Rearrangement | Planck’s Quantum Theory | Pseudo First Order Reaction | Rosenmund Reduction Mechanism | Salt Analysis |
| Saponification | Science in Everyday life and Its Importance | Sericulture: Rearing of Silkworm to Produce Silk | Spectrophotometer Principle | Zone Refining |
| Reactivity Series | Difference between isotropic and anisotropic | Introduction to p-Block elements | Plant fibres | Inert Gases: Uses |
| Benzoin Condensation | Difference between primary cell and secondary cell | Partition Chromatography | Applications of colloids | Displacement Reactions |
| Handpicking | Biogas: Uses of Biogas | Acid Rain | Types of Chemical Reactions | SN2 Reaction Mechanism |
| Complexometric Titration | markovnikov rule | Kohlrausch Law | Electrode | Valency Chart |
| Order of Reaction | Band Theory | Difference Between Rusting and Corrosion | Potentiometric Titration | Frenkel Defect |
| Deforestation | Stephen Reaction Mechanism | Gattermann – Koch Reaction Mechanism | Electronegativity | Industrial Waste: Types |
| Ethylene | Charge to Mass Ratio of an Electron | Fehling Solution | Photochemical Reactions | Difference Between Endpoint and Equivalence Point |
| Second Order Reaction | Etard Reaction | Forms of water | Preparation of Acetanilide | Metallic Minerals and Non-Metallic Minerals |
| Ferric Chloride | Henry's Law | Preparation of Mohr's salt | Schottky Defect | Claisen rearrangement |
| Calcium sulphate | Sodium carbonate | Rubber | Ethyl acetate | Conductometric Titration |
| Resorcinol | Difference Between Evaporation and Condensation | States of Matter | Boric Acid | Types of Minerals |
| Finkelstein Reaction | Electronegativity Chart | Difference between Solid, Liquid and Gas in tabular form | Aromaticity | Drawbacks of Rutherford's Atomic Model |
| Thermosetting Polymers | Preparation of Alkanes | Examples of Bases | Suzuki Coupling Reaction | Standard Electrode Potential |
| Disadvantages of Plastics | Reducing Agent | Van't Hoff Factor | Hard Water and Soft Water | Organometallic compounds |
| Gay Lussac's Law | Slaked Lime | Borax | Tetravalency of Carbon | Boyle's Law |
| Ellingham Diagram | Crystal Defects : Point Defects | HVZ Reaction (Hell-Volhard-Zelinsky Reaction) | Classification of Drugs | Preparation of Sulfuric Acid |
| Lucas test | Xenon Difluoride | Bravais Lattice | Classification of Oxides | Elimination Reaction |
| preparation of polythene, Teflon and polyacrylonitrile | Difference between cations and anions | Uses of Limestone | Fructose | Azeotropes |
| Lewis Acid and Base | Emulsification | Dielectric properties of solids | Zwitterion | Birch Reduction Mechanism |
| Oxidation and Reduction | Electrophilic Substitution Reaction | Suspensions | Aromatic Compounds | Ores and Minerals |
| Adsorption theory of heterogeneous catalysis | Wittig Reaction | Difference between evaporation and boiling | Intensive And Extensive Properties Of Matter | Electronic Configuration of Group 16 Elements |
| Difference Between Elements and Atoms | Sodium Oxide | Gypsum | Difference Between Alloy and Composite | Chemical Equations |
| Thorium | Lead Acid Battery | Isotopes of Hydrogen | Significant Figure Rules | Electrophilic Addition Reactions Of Alkenes |
| Isothermal Expansion of an Ideal Gas | Potassium Chloride - KCl | Aluminum Oxide | Difference Between Acetic Acid and Glacial Acetic Acid | Difference Between Polar and Nonpolar |
| Difference Between Baking Powder and Baking Soda | Test for Phenolic group | To prepare colloidal solution of starch | Uses of Mica | Pi Bonds |
| Potassium Chlorate | Schmidt Reaction | High density Polyethylene | Huckel's Rule | Discovery of Proton |
| Aluminium Ore: Extraction of Aluminium | Benzene Hexachloride | Caustic Potash or Potasium Hydroxide | Electromagnetic Radiation - Wave Nature | Atomic Number and Mass Number, Isotopes and Isobars |
| Preparation of Potash Alum | Beckmann Rearrangement | Heterogeneous Equilibrium | Butane | Factors Affecting Electrolytic Conductance |
| Scandium | Homogeneous Equilibrium | Phenols Nomenclcature | Galvanic Corrosion | Chlorine Trifluoride |
| Robinson Annulation | Copper | Pyridine | Silver Carbonate | Harmful Effects of Radiation |
Biology Concepts – Complete Reference List
From Cells to Evolution: All Important Biology Topics in One Table
| Conservation of Forest and Wildlife | Difference between Endosmosis and Exosmosis | Difference between Afforestation and Deforestation | Difference between Algae and Fungi | Difference between Cereals and Pulses |
| Difference Between Fragmentation and Regeneration | Difference Between Neurosis and Psychosis | Difference Between Nucleotide and Nucleoside | Difference Between Sea and Ocean | Difference Between Turtles and Tortoises |
| Difference Between Wildlife Sanctuary and National Park | Modes of Plant Reproduction | Ecological Pyramid and Its Types | Double Fertilization in Angiosperms | Ecosystem |
| Enzymes | Fertilisation in Plants | Five Kingdoms Classification | Flower | Ganongs Potometer |
| Health and Hygiene | Herbivores and Carnivores | Heterotrophic Nutrition | Human Digestive System | Vertebrates and Invertebrates |
| Morphology of Leaves | Modifications of Root | Phylum Aschelminthes | Diffusion | Osmosis |
| Prokaryotic Cells | Reproduction | Flora And Fauna | Overview of Food Chain | Difference Between Rabi And Kharif Crops |
| Vegetative Propagation | Transpiration | Soil Profile | Types of Pollution | Human Excretory System |
| Sense Organs | Rainwater Harvesting | Prokaryotic And Eukaryotic Cells | Living And Non Living Things | The Nucleus |
| Irrigation | Endoplasmic Reticulum | Difference Between Data And Information | Mitochondria | Nitrogen Cycle |
| Diagram of Animal Cell | Meristematic Tissue | Law of Segregation Law of Dominance | Eukaryotic Cells | Food Sources Animal Plant Products |
| Photosynthesis | Respiration | Ozone Layer Depletion | Kingdom Fungi | Aerobic Anaerobic Respiration |
| Cell Organelles | Peristalsis | Bacteria | Oogenesis | Leaves Morphology Types Modification |
| Mitosis and Meiosis | Dna Structure | How Do Organisms Reproduce | Diagram of Stomata | Monohybrid Cross Inheritance One Gene |
| Mechanism of Breathing | Soil Erosion | Plasmolysis | Urine Formation Osmoregulation | Porifera |
| Flagella | Amoeba | Aerobic Respiration | Pteridophyta | Arteries And Veins Difference |
| Reflex Action | Stomata | Cell Wall | Diagram of Neuron | A Guide To Composition And Function Of Lymph |
| Difference Between Ligaments And Tendons | Insectivorous Plants | Nutrition Modes Living Organisms | Mendel Laws Of Inheritance | Nutrition In Amoeba |
| Calorific Value | Air Pollution Control | Fertilization In Plants | Life Processes | Binary Fission |
| Omnivores | Saprophytes | Asexual Reproduction | Deficiency Diseases | Light Reaction Vs Dark Reaction |
| Global Warming | Wildlife Sanctuary | Viviparous Oviparous Embryo Development | Glycolysis | Food Preservation Methods Food Poisoning |
| Crops | Biofertilizers | Biodiversity Conservation | Difference Between Endocrine And Exocrine Glands | Greenhouse Effect Gases |
| Diagram Of Digestive System | Crop Production And Management | Types Of Pollination | Introduction and Characteristics of Living Beings | Meristematic Cells |
| Taxonomical Aids _Flora, Manual, Monograph And Catalogues | Types of leaves | structure of skeletal muscle | spirometry | human respiratory system |
| herbarium | dinoflagellates | general characters and structure of leaf | halophiles and their features | Exchange of Gases |
| Simple Permanent tissue | Morphology of root and its types | Complex permanent tissues | Regions of Root | History of classification and its need |
| Breathing And Exchange Of Gases | Transport of Gases | Regulation of Respiration | Disorders of Respiratory System | Interaction of Haemoglobin with Other Gases |
| Amniocentesis | Anatomy of flowering plants | ASSISTED REPRODUCTIVE TECHNOLOGIES (ARTs) | Meristematic Cells | Phloems |
| Population explosion | Reproductive Health | RCH (Reproductive and Child Health Care) | Medical termination of Pregnancy (MTP) | Plant kingdom |
| Biological Systems of Classification & Branches of Taxonomy | Pteridophytes | Gymnosperms | Angiosperms | Life cycle Patterns |
| Anatomy of Roots | Contraceptives | Anatomy of stem | Algae | Bryophytes |
| Tissues and its types | STDs (Sexually Transmitted Diseases) | Cell - The Basic Unit of Life & its Historical background | Cell theory and its modification | An Overview of Cell |
| Secondary growth in dicot stem | Tissue system and types | Prokaryotic (Bacterial) cell | Ribosomes | Eukaryotic cell |
| Cell: The basic unit of life | Cytoskeleton | Centrosome and Centriole | Cilia and flagella | Nucleus |
| Chromosomes | Evolution | Movement and Locomotion | Human Reproduction | Absorption and Translocation of Solutes |
| Soil as a reservoir of Essential Elements | LOCOMOTION AND MOVEMENT | Mechanism of Muscle Contraction | Morphology in Flowering Plants | Contractile proteins |
| Muscular System | Thyroid | Puberty | Hormones | Origin of Universe |
| Hypothalamus | Cell wall | Mitochondria | Special Chromosomes | Microbodies |
| Introduction, Hydroponics and the study of mineral requirements of the plants | Criteria of essentiality and Categorisation of Essential elements | Deficiency symptoms of essential elements and toxicity | The Stem | The Root |
| Cytoplasm and cell membrane | Mineral Nutrition | Male Reproductive System | Phylum Ctenophora | Role of Macronutrients |
| Role of Micronutrients | Phylum - Coelenterata / Cnidaria | Reptilia | Aves | Mammalia |
| Anatomy of the leaf | Animal kingdom | Phylum Annelida | Phylum Mollusca | Phylum Echinodermata |
| Vertebrata | Chordates | Disorders of circulatory system | Abiotic Factors | Male Reproductive System |
| Kingdom Animalia | Responses to Abiotic Factors | Female Reproductive System | Mammary Glands | Pregnancy and Embryonic Development |
| Cell | Cancer | Disorders of the Digestive System | Infertility | Morphology of Cockroach |
| Blood and Plasma | Alternation of Generations and Classification | Predation | Phaeophyceae and Rhodophyceae | Phylum Coelenterata |
| Phylum Porifera | Phylum Platyhelminthes | Chromosomal Disorders | Competition | Taxonomic Aids |
| Alternation of generation in Pteridophytes | Disorders of muscular and skeletal system | General Characteristics of Living | Digestive Glands | Stomach |
| Testis | Buccal cavity | Seed | Common Diseases in Humans | Permanent Tissue |
| Permanent Tissues Xylem | Pteridophytes Characteristics | Parasitism and Commensalism | Water Pollution and Its Control | Differentiation, Dedifferentiation and Redifferentiation |
| Organism and its Environment | Carbohydrates | Greenhouse Effect Gases | Amino Acids | Dynamic State of Body Constituents |
| Photosynthesis Chloroplast | Features of Living Beings | Blood Group | Lipids | Kingdom Protista |
| dense connective tissue | connective tissue cartilage | connective tissue blood | plant cell | viruses |
| the stem | Connective Tissue Bone | Viroids Prions Lichens | Animal cell | Prokaryotic Cell |
| Taxonomic Aids Herbarium and Museum | Sphygmomanometer and ECG | Population Attributes | Noise pollution |
All Biology Concepts at a Glance – Powered by Hodu Academy
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For subject-wise notes, solved PYQs, and strategy guides, explore the rest of Hodu Academy’s resource hub.
For subject-wise notes, solved PYQs, and strategy guides, explore the rest of Hodu Academy’s resource hub.
Last modified: Monday, 7 July 2025, 5:04 PM

