ICSE Class 10 Breathing and Exchange of Gases — Mock Test (2027)
Free online mock test for Breathing and Exchange of Gases (ICSE Class 10 Zoology) — 89 competency-based questions based on the latest CISCE 2027 syllabus, with instant marking. Try the samples below, then take the full test free.
What to expect: This mock test covers key concepts from the Breathing and Exchange of Gases chapter — including application-based and competency-focused questions aligned with how ICSE actually sets the paper.
Tip: Attempt without notes first to identify gaps, then review explanations for any wrong answers. Retake after a few days for best retention.
Sample questions
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1.Why does diffusion of gases occur only in the alveolar region and not in the conducting part of the respiratory system?
- A.Only the alveoli have a thin vascularised wall forming the exchange surface; the conducting part only transports, humidifies and cleans the air
- B.The conducting part is not connected to blood vessels at all
- C.The conducting part has thicker alveoli for exchange
- D.Gases cannot enter the trachea or bronchi
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2.Assertion (A): Air moves into the lungs during inspiration. Reason (R): During inspiration the intra-pulmonary pressure becomes less than the atmospheric pressure.
- A.Both A and R are true and R is the correct explanation of A
- B.Both A and R are true but R is NOT the correct explanation of A
- C.A is true but R is false
- D.A is false but R is true
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3.Assertion (A): Emphysema decreases the respiratory surface of the lungs. Reason (R): In emphysema the alveolar walls are damaged, one major cause being cigarette smoking.
- A.Both A and R are true and R is the correct explanation of A
- B.Both A and R are true but R is NOT the correct explanation of A
- C.A is true but R is false
- D.A is false but R is true
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4.Exchange of O2 and CO2 at the alveoli and tissues occurs mainly by:
- A.Simple diffusion based on pressure or concentration gradient
- B.Active transport requiring ATP
- C.Facilitated transport using carrier proteins
- D.Endocytosis
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5.Diffusion of gases occurs in the alveolar region and not in the other parts of the respiratory system. Which of the following best explains why?
- A.The alveoli form the exchange part, having a very thin diffusion membrane and favourable partial pressure gradients, while the conducting part only transports air
- B.The conducting part has a thinner wall than the alveoli
- C.The conducting part is the only site with a blood supply
- D.The alveoli are not in contact with any capillaries
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