give reasons as to why starch is stained with blue with iodine but cellulose is not though both polymer of glucose

Starch is made up of two component- amylose and amylopectin. Amylopectin is the component which is responsible for the blue colour of the starch with iodine. All glucose polymers does not contain amylopectin. That is why cellulose, though being a polymer of glucose, does not give blue colour with iodine solution.

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