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define starch in biology class 11
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A starch is a complex polysaccharide made up of a large number of glucose as monomeric units joined together by glycosidic bonds. It is white, tasteless, and odorless powder. It has a variable molar mass. It is insoluble in alcohol and in cold water. Its chemical formula is (C6H10O5)n -(H2O).
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it is a storage polysaccharide because it helps in storing energy in plant tissue. chemically , the starch is formed of two glucose monomers, that is a- amylose and amylopectin.
starch forms helical secondary structure. thus , it can hold iodine molecules in its helical portion.
therefore, gives blue colour with iodine solutions.
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