Q52 of 79 Page 54

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

The inner surface of small intestine has numerous finger-like structures, called Villi. Villi increase the surface area of small intestine so that optimal absorption takes place.


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50

What will happen if mucus is not secreted by the gastric glands?

 51

What is the significance of emulsification of fats?

 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


 54

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