(a) Why is there a difference in the rate of breathing between aquatic organisms and terrestrial organisms? Explain.(b) Draw a diagram of human respiratory system and label - pharynx, trachea, lungs, diaphragm and alveolar sac on it.

(a) The rate of breathing in aquatic organisms is much faster than in terrestrial organisms because aquatic animals breathe from the oxygen dissolved in water. The dissolved oxygen present in water bodies is less as compared to the amount of oxygen present in the atmosphere.

As water contains two hydrogens and one oxygen molecule, this dissolved oxygen is utilized by the aquatic animals for breathing. The oxygen for terrestrial animals is obtained from the air present in the surrounding atmosphere.

(b)  A labeled diagram of the Human Respiratory System is given below:

   

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Updated on: 18-Jan-2023

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