Gaseous Exchange & Respiration: Class 10 Biology Worksheet

Air passes down the trachea into the lungs, where oxygen diffuses from the alveoli into the blood and carbon dioxide moves the other way to be breathed out; the diaphragm below the lungs drives each breath. On this sheet, learners pick the right answer from A to D in a set of multiple-choice questions on the breathing system and gas exchange, scored out of 15.