Answer:
(a)
The wall of trachea are lined by cartilaginous rings that helps in maintaining
the rigidity of the trachea. Hence, the trachea do not collapse in insufficient
air. (1)
(b) Aquatic animals utilise the oxygen dissolved in water for
respiration. Since, the amount of dissolved oxygen is fairly low compared to
the amount of oxygen in air, the rate of breathing is faster in aquatic
organisms. (1)
(c) Haemoglobin is present in RBC in human beings. It is a
respiratory pigment, that helps in easy and faster transport of oxygen all
through the body. (1)
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