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Biology: What is Respiration MCQs PDF Download

MCQ: Air pressure in thorax increases in

A) anaerobic respiration
B) inspiration
C) expiration
D) digestion

MCQ: Blood entering the lungs contain very

A) little oxygen (O2) only
B) high carbon dioxide (CO2) only
C) low carbon dioxide (CO2)
D) little oxygen (O2) and high carbon dioxide (CO2)

MCQ: In expiration in process of respiration

A) the diaphragm relaxes and arches upwards
B) air enters the lungs
C) ribs move upwards
D) sternum moves up and away from backbone

MCQ: Stimulus for breathing is

A) lack of oxygen in blood
B) excess of carbon dioxide in blood
C) contraction of alveoli
D) diaphragm movements

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

A) water
B) ethanol
C) lactic acid
D) carbon dioxide

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A Level Biology MCQ Questions

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What is Respiration MCQs Book Questions

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