Question

(a) What is common for Cuscuta, ticks and leeches ?

(b) Name the substances on which the following enzymes act in the human digestive system :

(i) Trypsin

(ii) Amylase

(iii) Pepsin

(iv) Lipase

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

Answer 1

(a) Parasitic mode of nutrition.

(b) (i) Proteins

(ii) Starch

(iii) Proteins

(iv) Fats.

(c) Absorption of digested foods occurs mainly in the small intestine due to the presence of a large number of finger like projections called villi.