Biology Topics

Explore biology concepts explained clearly for learning and revision.

BiologyNotes organizes biology into core topics to help students understand concepts clearly and study effectively. These biology topics are explained in a structured and simple manner, making them useful for school students, college learners, and exam preparation across different curricula worldwide.

Cell Biology

Structure, function, and organization of cells — the basic unit of life.

  • Cell structure

  • Cell cycle

  • Biomolecules

Plant Biology

Physiology, anatomy, and reproduction in plants.

  • Photosynthesis

  • Transport in plants

  • Plant growth

Human Physiology

Understanding how human body systems function and interact.

  • Digestive system

  • Circulatory system

  • Nervous system

Human Physiology

Understanding how human body systems function and interact.

  • Digestive system

  • Circulatory system

  • Nervous system

Ecology & Environment

Interactions between organisms and their environment.

  • Ecosystems

  • Biodiversity

  • Environmental issues

Biotechnology & Applied Biology

Applications of biology in medicine, agriculture, and industry.

  • Genetic engineering

  • Biotechnology tools

  • Applications

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Biology Topics

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