Q1. In the lungs, exchange of gases takes place in the:
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Answer: A. Alveoli
Alveoli are thin-walled air sacs where oxygen and carbon dioxide are exchanged with blood.
Biology - Respiratory System Questions for SSC CGL (with Answers)
7 Biology - Respiratory System MCQs from the General Awareness section, with answers and short explanations.
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Q2. Which dome-shaped muscular sheet separates the chest cavity from the abdomen and helps in breathing?
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Answer: A. Diaphragm
The diaphragm separates the thorax from the abdomen; its contraction helps draw air into the lungs.
Q3. During heavy exercise, anaerobic respiration in human muscles produces:
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Answer: D. Lactic acid
When oxygen is short, muscle cells break glucose into lactic acid, which can cause cramps.
Q4. The end products of aerobic respiration are:
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Answer: C. Carbon dioxide, water and energy
Aerobic respiration completely breaks glucose into carbon dioxide and water, releasing much energy.
Q5. Anaerobic respiration in yeast produces:
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Answer: B. Ethanol and carbon dioxide
Yeast ferments glucose anaerobically into ethanol and carbon dioxide.
Q6. Which molecule is known as the 'energy currency' of the cell?
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Answer: A. ATP
ATP stores and supplies energy for cellular activities, so it is called the energy currency.
Q7. Which flap prevents food from entering the windpipe during swallowing?
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Answer: C. Epiglottis
The epiglottis closes over the glottis during swallowing so food does not enter the trachea.
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