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Biology class 10 Chapter 10 Gaseous Exchange—MCQs (1–100) What is the primary function of the respiratory system? a) Digestion b) Circulation c) Gaseous exchange d) Excretion Answer: c Which gas is taken in during inhalation? a) Carbon dioxide b) Oxygen c) Nitrogen d) Hydrogen Answer: b In humans, gaseous exchange occurs in: a) Trachea b) Bronchi c) Alveoli d) Larynx Answer: c What is the process of breathing in called? a) Exhalation b) Inhalation c) Respiration d) Ventilation Answer: b Which structure prevents food from entering the windpipe? a) Glottis b) Larynx c) Epiglottis d) Alveolus Answer: c What is the main respiratory pigment in humans? a) Hemocyanin b) Hemoglobin c) Myoglobin d) Chlorophyll Answer: b In plants, gaseous exchange occurs through: a) Phloem b) Stomata c) Xylem d) Cuticle Answer: b Which of the following is not a part of the human respiratory system? a) Lungs b) Trachea c) Kidney d) Bronchi Answer: c ...