Starch and cellulose are complex carbohydrates composed of many glucose units linked together. Starch is made of alpha-glucose units and is found in plants where it stores food. It can be broken down to release glucose. Cellulose is made of beta-glucose units and provides structure to plant cell walls. It is the most abundant carbohydrate but humans cannot break it down due to a lack of the cellulase enzyme.

2. Introduction
 Carbohydrates consisting a large number of
monosaccharide units
 Monosaccharide units linked by Glycosidic bond
 High Molecular mass
 Taste less
 Insoluble in water

3.  Non-reducing in nature
 Obtained from Plants and Animals
 Starch
 Cellulose
 Glycogen
 All Polymers of Glucose

5. Starch
 Found in plants
 Plants store food in this form
 Rarely found in Animals
 Polymer of alpha-D Glucose
 Maize, Wheat, Barley are rich sources
 Hydrolyzed to form Alpha-Glucose: The energy bank

6. Cellulose

7. Cellulose
 Found in cell wall of Plants
 Most abundant carbohydrate
 Polymer of Beta-D Glucose
 Cotton, Wood etc.
 Hydrolyzed to Produce Beta-D Glucose
 Hydrolysis not possible in Humans as they lack
Cellulase enzyme
 Act as Dietary Fiber