a) What is the 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 the absorption of digested food occur mainly in the small intestine?

• The common feature in Cuscuta, ticks and leeches is they all undergo parasitic mode of nutrition. In this mode of nutrition the organisms feed themselves by depending on the host or on other living
• (i) Trypsin: The trypsin enzyme acts on the In the small intestine, the enzyme breaks down into proteins, and continues the process of digestion that began in the stomach.
• Amylase: The amylase enzyme acts on Amylase helps in the conversion of starch into maltose. This helps in the breakdown of polysaccharide into glucose, maltose and other simpler products.
• Pepsin: The Pepsin enzyme acts on the An enzyme secreted by gastric glands in the stomach which acts on proteins.
• Lipase: The enzyme lipase acts on It is an enzyme that breaks down dietary fats into smaller molecules called fatty acids and glycerol. This enzyme specifically digests butterfat in the food.
• Absorption of digested foods occurs mainly in the small intestine due to the presence of a large number of finger-like projections called These projections absorb the protein molecules and help in the transfer of the proteins to all cells and tissues.

(a) Why is the small intestine in herbivores lon