NEET2023BotanyBiomolecules (B)Actual
Cellulose does not form blue colour with Iodine because
Options
- AIt breaks down when iodine reacts with it.
- BIt is a disaccharide.
- CIt is a helical molecule.
- DIt does not contain complex helices and hence cannot hold iodine molecules.
Correct answer
D. It does not contain complex helices and hence cannot hold iodine molecules.
Step-by-step solution
Cellulose is a polymeric polysaccharide consisting of only one type of monosaccharide, i.e., glucose. Cellulose is a homopolymer. Starch is a variant of this but is present as a storehouse of energy in plant tissues. Starch forms helical secondary structures, and it can hold iodine molecules in the helical portion. The starch-iodine is blue. Cellulose does not contain complex helices and hence cannot hold iodine.