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Class 7 Science: Chapter 10 - Respiration in Organisms, 1. Why does an athlete breathe faster and deeper than usual after finishing the race?, Solution1:, An athlete consumes a lot of energy during running which is produced by oxidation of glucose., By breathing deeper and faster, the athlete is basically consuming more and more oxygen to, meet his or her energy requirements., 2. List the similarities and differences between aerobic and anaerobic respiration., Solution2:, Aerobic Respiration, 1) It happens in the presence of oxygen, 2) Main products are CO2 and H2O, 3) Large amount of energy is produced., Anaerobic Respiration, 1) It happens in the absence of oxygen., 2) The end products can be CO2,Lactic acid and alcohol., 3) Small amount of energy is produced as compared to aerobic respiration., 3. Why do we often sneeze when we inhale a lot of dust-laden air?, , Solution3:, By sneezing, our body tries to expel the dust particles from the air we inhaled so that only clean, air enters our body., 4. Take three test-tubes. Fill ¾th of each with water. Label them A, B and C. Keep a snail in, test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube, would have the highest concentration of CO2?, , Solution4:, The concentration of CO2 will be highest in test-tube A because snail takes oxygen and, breathes out carbon dioxide. Whereas, plants take CO2 and produce oxygen.