MCQ practice · SSC Biology Board questions · Chapter 7: Exchange of Gases
Which is the main organ of the respiratory system?
Think it through first, then pick an option.
- a larynx
- b trachea
- c lung
- d nostril
Answer and explanation
Correct answer: c lung
The lungs are the main organ of the respiratory system.
Why the other options are wrong
- a larynx: "larynx" does not fit here. The lungs are the main organ of the respiratory system.
- b trachea: "trachea" does not fit here. The lungs are the main organ of the respiratory system.
- d nostril: "nostril" does not fit here. The lungs are the main organ of the respiratory system.
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