ICSE Class 10 Breathing and Exchange of Gases — Mock Test

Free online mock test for Breathing and Exchange of Gases (ICSE Class 10 Zoology) — 89 competency-based questions with instant marking. Try the samples below, then take the full test free.

Sample questions

1.Emphysema is a chronic disorder in which alveolar walls are damaged, decreasing the respiratory surface. One of its major causes is:
- A.Cigarette smoking
- B.Excess oxygen intake
- C.High altitude living
- D.Bacterial infection of pharynx
2.![oxygen_dissociation_curve.png]() In Figure 14.5, what does the quantity plotted along the horizontal (X) axis represent?
- A.Partial pressure of oxygen (mm Hg)
- B.Percentage saturation of haemoglobin with oxygen
- C.Partial pressure of carbon dioxide (mm Hg)
- D.Concentration of hydrogen ions
3.A sigmoid curve obtained when percentage saturation of haemoglobin with O2 is plotted against pO2 is called the:
- A.Oxygen dissociation curve
- B.Carbon dioxide dissociation curve
- C.Spirogram
- D.Catabolic curve
4.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
5.The very thin, irregular-walled and vascularised bag-like structures that arise from each terminal bronchiole are the:
- A.Alveoli
- B.Bronchi
- C.Pleurae
- D.Glottis

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