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Important Questions

The Respiratory System

ICSE · Class 9 · Biology

Most important questions from The Respiratory System for ICSE Class 9 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.

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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45 Questions·
multiple choicemultiple correcttrue false

Sample Questions

1multiple correct

Which of the following are products of aerobic respiration? (Select all correct answers)

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Carbon dioxide, Water, Energy (ATP)

The equation for aerobic respiration is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy. The products are carbon dioxide, water, and energy in the form of ATP.

2true false

Anaerobic respiration in animals produces lactic acid.

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True

In animals, anaerobic respiration breaks down glucose to produce lactic acid (not CO₂). This happens in muscles during intense exercise when oxygen supply is insufficient.

3multiple correct

Which muscles are involved in inspiration (breathing in)? (Select all correct answers)

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Diaphragm, External intercostal muscles

During inspiration, the diaphragm contracts and flattens while external intercostal muscles contract to lift the ribs upward and outward, increasing chest cavity volume.

4true false

Tidal volume refers to air that can be forcibly expelled after normal expiration.

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False

Tidal volume is the air breathed in and out during normal, quiet breathing (500 mL). The air that can be forcibly expelled after normal expiration is called expiratory reserve volume.

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Frequently Asked Questions

What are the important topics in The Respiratory System for ICSE Class 9 Biology?
The Respiratory System covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in The Respiratory System — ICSE Class 9 Biology?
Understand the core concepts first, then work through the 45 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.
How many important questions are there in The Respiratory System?
There are 45 practice questions available for The Respiratory System. These cover multiple question types including MCQs, short answer, and long answer questions.

Sources & Official References

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

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