(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 the absorption of digested food occurs mainly in the small intestine?
A)Cuscuta, ticks and leeches all are Parasites.
Parasites are organisms which feed on other living organisms called its Host. A parasite receives its food from the host but gives no benefit to the host in return. The host may be plant or animal.
B)Enzyme Substrate
TRYPSIN - PROTEINS
AMYLASE - STARCH
PEPSIN - PROTEINS
LIPASE - FATS
c)Small intestine contains finger-like projections called the villi. These villi help in the efficient absorption of food. And also the complete digestion takes place at small intestine when pancreatic juice and bile is poured into the intestine and break the food down to absorbable form. That is why absorption of digested food occurs mainly in the small intestine.