Q55 of 79 Page 54

Why is blood circulation in human heart called double circulation?

In double circulation, blood passes through the heart twice in one complete cycle of the body.


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53

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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


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

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What is the advantage of having four chambered heart?

 57

Mention the major events during photosynthesis.