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.Which enzyme, present in high concentration in RBCs, facilitates the formation and breakdown of carbonic acid during carbon dioxide transport?
- A.Carbonic anhydrase
- B.Carbamino-haemoglobin
- C.Pepsin
- D.Amylase
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2.The respiratory rhythm centre primarily responsible for the regulation of respiration is present in the:
- A.Medulla region of the brain
- B.Pons region of the brain
- C.Cerebellum
- D.Hypothalamus
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3.The primary sites of exchange of gases in the human respiratory system are the:
- A.Alveoli
- B.Bronchi
- C.Trachea
- D.Pharynx
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4.Which of the following statements about the transport of gases is INCORRECT?
- A.About 97 per cent of oxygen is transported by RBCs in the blood
- B.Nearly 70 per cent of carbon dioxide is carried as bicarbonate
- C.About 7 per cent of carbon dioxide is carried in a dissolved state through plasma
- D.Nearly 70 per cent of oxygen is carried in a dissolved state through plasma
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5.Inspiration occurs when the intra-pulmonary pressure is:
- A.Less than the atmospheric pressure
- B.Higher than the atmospheric pressure
- C.Equal to the atmospheric pressure
- D.Zero
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