O-LevelBiologyRespiration5090/11 · May/June 2023 · Q141 Mark
Some students were each given the apparatus shown. They placed the mouthpieces in their mouths and then gently breathed in and out through the apparatus ten times. Which statement describes what happened when they breathed in and out?
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AWhen they breathed in, air from the room bubbled through test-tube U and the limewater became cloudy in test-tube U.
BWhen they breathed out, air from their lungs bubbled through test-tube T and the limewater became cloudy in test-tube T.
CWhen they breathed in, air from the room bubbled through test-tube T and the limewater remained clear in test-tube T.
DWhen they breathed out, air from their lungs bubbled through test-tube U and the limewater remained clear in test-tube U.
✓ Correct answer
C: When they breathed in, air from the room bubbled through test-tube T and the limewater remained clear in test-tube T.
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