1 . Starch , ( C6H10O5 ) N
It is a polymer of a-glucose and a major reserve food in plants . It turns blue with iodine . It is a mixture of two components :
1 . Amylose ( 20 %), an unbranched water soluble polymer . 2 . Amylopectin ( 80 %), a branched water insoluble polymer .
Sources of starch are potatoes , wheat , rice , maize , etc .