The Respiratory System
ICSE · Class 9 · Biology
Practice quiz for The Respiratory System — ICSE Class 9 Biology. MCQs and questions with answers to test your preparation.
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What is the main function of respiration?
The voice box is also known as:
What is the normal breathing rate in healthy adults per minute?
The tiny air sacs in the lungs are called:
Sample Questions
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.
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.
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.
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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