CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 19
- (a)In the process of respiration, state the function of alveoli.
- (b)Rate of breathing in aquatic organisms is much faster than that in terrestrial organisms. Give reasons.
- (c)Complete the following pathway showing the breakdown of glucose :
Answer
Alveoli exchange gases; water holds little oxygen, so aquatic organisms breathe faster; the missing products are pyruvate and carbon dioxide.
(a) The alveoli are the sites of exchange of gases: oxygen from the inhaled air diffuses into the blood in the capillaries around them, and carbon dioxide from the blood passes into them to be breathed out.
(b) The amount of oxygen dissolved in water is fairly low compared with the amount of oxygen in air, so aquatic organisms have to breathe much faster to obtain enough oxygen.
(c) (i) Pyruvate (a 3-carbon molecule); (ii) Carbon dioxide.
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