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Full A-Level Biology Notes PDF (Forms 5–6) – Complete Revision Guide (2026) |
Full A-Level Biology Notes PDF (Forms 5–6) – Free Download, Complete Revision Notes & Study
Introduction
A-Level Biology is a scientific study of living organisms and their interactions with the environment. The subject develops analytical, investigative, and practical skills essential for careers in medicine, agriculture, biotechnology, environmental science, and health sciences.
These notes are structured according to standard A-Level Biology topics and provide concise explanations, key definitions, examples, and examination tips.
Chapter 1: Cell Structure and Organization
Definition of a Cell
A cell is the basic structural and functional unit of life.
Cell Theory
- All living organisms are composed of cells.
- The cell is the basic unit of life.
- New cells arise from pre-existing cells.
Types of Cells
Prokaryotic Cells
Characteristics:
- No true nucleus
- DNA freely suspended in cytoplasm
- Lack membrane-bound organelles
- Small in size
Examples:
- Bacteria
- Cyanobacteria
Eukaryotic Cells
Characteristics:
- True nucleus present
- Membrane-bound organelles present
- Larger and more complex
Examples:
- Plants
- Animals
- Fungi
Cell Organelles and Functions
| Organelle | Function |
|---|---|
| Nucleus | Controls cell activities |
| Mitochondria | Site of respiration |
| Ribosomes | Protein synthesis |
| Golgi Body | Packaging and transport |
| Endoplasmic Reticulum | Material transport |
| Lysosomes | Digestion |
| Chloroplast | Photosynthesis |
| Vacuole | Storage |
Chapter 2: Biological Molecules
Carbohydrates
Functions:
- Energy source
- Energy storage
- Structural support
Examples:
- Glucose
- Starch
- Glycogen
- Cellulose
Proteins
Functions:
- Growth and repair
- Enzymes
- Hormones
- Antibodies
Lipids
Functions:
- Energy storage
- Thermal insulation
- Cell membrane formation
Nucleic Acids
DNA
Functions:
- Carries genetic information
- Controls inheritance
RNA
Types:
- mRNA
- tRNA
- rRNA
Chapter 3: Enzymes
Definition
Enzymes are biological catalysts that speed up chemical reactions without being used up.
Characteristics
- Protein in nature
- Specific in action
- Reusable
- Affected by temperature and pH
Factors Affecting Enzyme Activity
Temperature
- Optimum temperature gives maximum activity.
- High temperatures denature enzymes.
pH
Different enzymes have different optimum pH values.
Substrate Concentration
Higher concentration increases reaction rate until saturation point.
Chapter 4: Nutrition
Autotrophic Nutrition
Organisms manufacture their own food.
Example:
- Green plants
Heterotrophic Nutrition
Organisms depend on other organisms for food.
Examples:
- Animals
- Fungi
Photosynthesis
Definition: Process by which green plants manufacture food using sunlight.
Equation:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Requirements:
- Chlorophyll
- Sunlight
- Carbon dioxide
- Water
Chapter 5: Respiration
Definition
Release of energy from food substances.
Types
Aerobic Respiration
Occurs in presence of oxygen.
Equation:
Glucose + Oxygen → Carbon dioxide + Water + Energy
Anaerobic Respiration
Occurs without oxygen.
Products:
- Lactic acid (animals)
- Ethanol and carbon dioxide (yeast)
Chapter 6: Transport in Living Organisms
Transport in Plants
Xylem
Functions:
- Water transport
- Mineral transport
Phloem
Functions:
- Food transport
Transport in Mammals
Blood Components
- Red blood cells
- White blood cells
- Platelets
- Plasma
Double Circulation
- Pulmonary circulation
- Systemic circulation
Chapter 7: Genetics and Inheritance
Key Terms
Gene
Unit of heredity.
Allele
Alternative form of a gene.
Genotype
Genetic makeup.
Phenotype
Observable characteristics.
Mendel's Laws
Law of Segregation
Alleles separate during gamete formation.
Law of Independent Assortment
Genes assort independently.
Chapter 8: Evolution
Definition
Gradual change in organisms over time.
Evidence of Evolution
- Fossils
- Comparative anatomy
- Embryology
- Molecular biology
Natural Selection
Proposed by Charles Darwin.
Conditions:
- Variation
- Competition
- Survival advantage
- Reproduction
Chapter 9: Ecology
Ecosystem
Interaction between organisms and environment.
Food Chain
Example:
Grass → Grasshopper → Frog → Snake → Hawk
Food Web
Interconnected food chains.
Ecological Terms
Habitat
Place where organism lives.
Niche
Role played by organism.
Population
Group of organisms of same species.
Community
All populations in an area.
Chapter 10: Human Health and Diseases
Communicable Diseases
Examples:
- Malaria
- Tuberculosis
- Cholera
Prevention
- Proper sanitation
- Vaccination
- Personal hygiene
- Safe water
Immunity
Ability of body to resist diseases.
Types:
- Natural immunity
- Artificial immunity
Practical Biology Skills
Students should be able to:
- Use microscopes correctly
- Draw biological specimens
- Conduct experiments
- Record observations
- Interpret data
- Write scientific reports
Examination Tips
- Learn biological terms and definitions.
- Practice diagrams regularly.
- Revise past papers.
- Master biological processes.
- Answer questions systematically.
- Label diagrams correctly.
- Manage examination time effectively.
📥 Download A-Level Biology Notes PDF (All Topics)
Access high-quality A-Level Biology notes covering all major topics in the syllabus. These notes are suitable for Form Five and Form Six students preparing for examinations and self-study.
- Cell Structure Notes PDF
- Biomolecules Notes PDF
- Cell Membrane and Transportation PDF
- Mitotic Cell Division PDF
- Nucleic Acids Notes PDF
- Transport in Plants PDF
- Gas Exchange PDF
- Transport in Mammals PDF
- Infections and Diseases PDF
- Immunity Notes PDF
- Energy and Respiration PDF
- Photosynthesis Notes PDF
- Control and Coordination PDF
- Inherited Change Notes PDF
- Selection Notes PDF
- Biodiversity Notes PDF
- Genetic Technology PDF
Keywords
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Disclaimer: These educational materials are provided for learning and revision purposes only.
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