Key Summary & High-Yield Concept Takeaways
Curated by senior faculty at Hodu Academy for fast revision, formula derivations, and standard board & competitive exam marking schemes.
- ✓350+ Key Biology concepts, definitions, diagrams & processes ( IGCSE & IB compatible)
- ✓Important cycles, physiological laws, and quick facts
- ✓Short explanations, differences & diagrams (cell, tissues, reproduction, more)
- ✓SI units & constants in Biology
Biology Important Concepts, Formulae & Laws (CBSE, IGCSE, IB, JEE, NEET)
Your shortcut to Biology mastery! Here’s your all-in-one list for crucial Biology concepts, definitions, laws, diagrams and key terms – handpicked by Hodu Academy’s Biology team.
Perfect for last-minute revision, board exams (CBSE/ICSE/IGCSE/IB), NEET/JEE aspirants, and Olympiad toppers. Every topic is mapped for fast learning and exam scoring.
Bookmark this page as your Biology cheat-sheet—latest for 2025, and 100% relevant for IGCSE, IB & other international boards!
Perfect for last-minute revision, board exams (CBSE/ICSE/IGCSE/IB), NEET/JEE aspirants, and Olympiad toppers. Every topic is mapped for fast learning and exam scoring.
Bookmark this page as your Biology cheat-sheet—latest for 2025, and 100% relevant for IGCSE, IB & other international boards!
This page covers:
- 350+ Key Biology concepts, definitions, diagrams & processes (IGCSE & IB compatible)
- Important cycles, physiological laws, and quick facts
- Short explanations, differences & diagrams (cell, tissues, reproduction, more)
- SI units & constants in Biology
- Rapid revision for boards, NEET, Olympiads & interviews
Why Use This Biology Cheat Sheet?
Biology connects us to the living world, health, and nature. It is crucial for NEET, JEE (Bio), Olympiads, CBSE, ICSE, IGCSE, IB and more. But Biology involves hundreds of terms, definitions, cycles, diagrams, and tricky differences.
This page helps you:
Tip: Boost recall with Biology MCQ quizzes and diagram practice!
This page helps you:
- Revise hundreds of definitions, diagrams, cycles and differences in minutes
- Look up every important law, classification, process or definition instantly
- Find biological terms, cycles, or diagrams that are always asked in exams
- Be ready for IGCSE, IB & NEET Biology questions
Tip: Boost recall with Biology MCQ quizzes and diagram practice!
Complete Biology Important Concepts, Definitions & Laws List
300+ must-know Biology topics for Boards & Competitive Exams (including IGCSE & IB)
Categories covered: Cell Biology, Genetics, Plant & Animal Physiology, Classification, Ecology, Environment, Health & Disease, and more!
Mapped to: CBSE, ICSE, IGCSE, IB Diploma, NEET, JEE & Olympiads
Mapped to: CBSE, ICSE, IGCSE, IB Diploma, NEET, JEE & Olympiads
| 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 |
Biology Must-Know Laws, Principles & Cycles
Important Laws, Cycles & Principles:
SI Units & Constants:
- Mendel’s Laws of Inheritance (Dominance, Segregation, Independent Assortment)
- Cell Theory, Modern Cell Theory
- Lamarckism, Darwin’s Theory of Evolution, Neo-Darwinism
- Hardy-Weinberg Principle, Biological Classification
- Photosynthesis, Respiration (Aerobic & Anaerobic), Nitrogen Cycle, Carbon Cycle, Water Cycle
- Enzyme Action, Lock and Key Hypothesis
- Ecological Pyramid, Food Chain & Food Web, Biogeochemical Cycles
- Principles of Homeostasis, Feedback Mechanisms
- Central Dogma of Molecular Biology
SI Units & Constants:
- Cell diameter (μm), Life span (years, days, hours), Chromosome number
- Enzyme concentration (μmol/L), Population density (individuals/km²)
- Blood pressure (mm Hg), Body temperature (°C), Pulse rate (bpm)
- pH scale (unitless), Genetic frequency (%)
Tips to Score 90+ in Biology
- Practice labelling diagrams, cycles and definitions (use this list for daily recall!)
- Memorize key terms, physiological laws, and differences (difference between…)
- Review all classifications, cycles, plant/animal physiology topics and genetic laws
- Use Hodu Academy’s Biology MCQs and diagram practice sheets for rapid revision
For PDF downloads, practice sheets, or doubts, Contact Hodu Academy now!
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