IGCSE O Level Biology MCQs – Practice Test for Exam Prep

What is Respiration Multiple Choice Questions with Answers – PDF Download

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What is Respiration MCQs PDF Download – Prep Test

MCQ 1: Air pressure in thorax increases in:

anaerobic respiration
inspiration
expiration
digestion

MCQ 2: Blood entering the lungs contain very:

little oxygen (O₂) only
high carbon dioxide (CO₂) only
low carbon dioxide (CO₂)
little oxygen (O₂) and high carbon dioxide (CO₂)

MCQ 3: In expiration in process of respiration:

the diaphragm relaxes and arches upwards
air enters the lungs
ribs move upwards
sternum moves up and away from backbone

MCQ 4: Stimulus for breathing is:

lack of oxygen in blood
excess of carbon dioxide in blood
contraction of alveoli
diaphragm movements

MCQ 5: In anaerobic respiration (without O₂) in mammals, the wastes are:

water
ethanol
lactic acid
carbon dioxide

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