Q1: Why does athlete breathe faster and deeper than usual after finishing the race?
Ans: An athlete needs more energy during the race and after. Since demand for the energy is high the breakdown of food must be speeded up. This requires more oxygen to be supplied. This is why an athlete not only breathes fast, but also take deep breathes and thus inhale more oxygen.
Q2: List the similarities and differences between aerobic and anaerobic respiration.
Ans: The following table shows the similarities and differences between aerobic and anaerobic respiration:
|Aerobic Respiration||Anaerobic Respiration|
Q3: Why we often sneeze when we inhale a lot of dust-laden air?
Ans: The air around us has various types of unwanted suspended particles like- smoke, dust, pollens etc. When we inhale these particles get trapped in the hair present in our nasal cavity. However, sometimes these particles may get past the hair present in our nasal cavity. Then they irritate the lining of the cavity as a result of which we sneeze. Sneezing expels these foreign particles from the inhaled air and a dust-free, clean air enters our body.
Q4: Tick the correct answer:
a. In cockroaches air enters the body through
b. During heavy exercise, we get cramps in the legs due to the accumulation of
c. Normal range of breathing rate per minute in an average adult person at rest is -
d. During exhalation, the ribs
Q5: Match the items in Column I with those in Column II:
|Column I||Column II|
Ans: 1-c, 2-d, 3-a, 4-e, 5-b, 6-d,
Q6: Mark true (T) and false (F)