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Syllabus

The Respiratory System — Syllabus

ICSE · Class 9 · Biology

What The Respiratory System covers in ICSE Class 9 Biology: 4 topics, for the 2026-27 session. Part of the ICSE Class 9 Biology syllabus.

45 questions40 flashcards5 concepts

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A high-level flowchart illustrating the three main stages of aerobic cellular respiration: Glycolysis, Krebs Cycle, and Electron Transport System, along with their respective locations within the cell
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4 Topics · ICSE Class 9 Biology · 2026-27

Topics in The Respiratory System

1

1. Need for Respiration and Cellular Respiration

  • Respiration involves the breakdown of glucose using oxygen.
  • The overall reaction is: C6H12O6 + 6O2 → 6CO2 + 6H2O + energy.
  • This reaction occurs inside living cells, so it is called cellular or tissue respiration.
2

2. Aerobic and Anaerobic Respiration

  • Aerobic respiration uses oxygen and is the normal type in animals.
  • Anaerobic respiration is respiration without oxygen.
  • Anaerobic respiration in animals is exceptional and temporary.
3

3. Parts of Respiration

  • Respiration has four major parts in humans.
  • Breathing is the physical process of taking air in and forcing it out of the lungs.
  • Gaseous transport means oxygen is carried by RBCs and carbon dioxide is carried back to the lungs as bicarbonates in plasma and as carbamino-haemoglobin with haemoglobin.
4

4. Respiratory Organs and Their Functions

  • The human respiratory system includes the nose, pharynx, larynx, trachea, bronchi, and lungs.
  • The nose has two nostrils separated by a cartilaginous septum.
  • The inner lining of the nasal chambers warms air, adds moisture, and traps harmful particles with mucus.

Key Concepts

Central concept: Respiration in humans and other organisms involves breathing, gaseous transport, tissue respiration, and cellular respiration to release energy from glucose

Need for respirationGlucoseATPTypes of respirationCellular respirationGlycolysisKrebs cycleRespiratory organs

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Frequently Asked Questions

What are the important topics in The Respiratory System for ICSE Class 9 Biology?
Key topics in The Respiratory System include Need for Respiration and Cellular Respiration, Aerobic and Anaerobic Respiration, Parts of Respiration, Respiratory Organs and Their Functions. Study these first, then practise questions on each for Class 9 exams.
How should I revise The Respiratory System for Class 9 exams?
Learn the core ideas first, then work through the 45 practice questions on The Respiratory System. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All ICSE Class 9 Biology Syllabus

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