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10 must-know biology diagrams

Hand-drawn, exam-ready diagrams with clear labels and notes for CBSE and ICSE Classes 9-12. Tap any diagram to enlarge, or download the full set as a PDF.

Use these as quick revision prompts before class, tests, and board exam practice.

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Diagram 01

Neuron

  • Structure of neuron
  • Transmission of nerve impulse

Diagram 02

Structure of Nephron

  • Filtration
  • Reabsorption
  • Urine formation

Diagram 03

Human Digestive System

  • Digestion
  • Absorption

Diagram 04

Human Heart

  • Double circulation
  • Function of heart

Diagram 05

Respiratory System & Stomata

  • Human respiratory system
  • Breathing
  • Stomata structure & function
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