Q54 of 79 Page 54

Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms

The oxygen content of water is much less than the oxygen content of air and hence rate of breathing is aquatic organisms is faster than in terrestrial organisms.


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52

Why does absorption of digested food occur mainly in the small intestine?

 53

Match Group (A) with Group (B)























A



B



(a) Autotrophic nutrition



(i) Leech



(b) Heterotrophic nutrition



(ii) Paramecium



(c) Parasitic nutrition



(iii) Deer



(d) Digestion in food vacuoles



(iv) Green plants


 55

Why is blood circulation in human heart called double circulation?

 56

What is the advantage of having four chambered heart?