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Floridean starch has structure similar to:
Red algae store reserve food as floridean starch, which has a branched polyglucan structure remarkably similar to amylopectin and animal glycogen (alpha-1,4 and alpha-1,6 glycosidic bonds). Mark Amylopectin and glycogen (Option 2) in 5 seconds!
Chlorophyceae store true starch (amylose + amylopectin); Phaeophyceae store complex carbohydrates as laminarin or mannitol; Rhodophyceae store reserve food as Floridean starch.
Floridean starch is a branched alpha-glucan polysaccharide containing alpha-(1->4)-glucosidic linear linkages and frequent alpha-(1->6)-glucosidic branch points.
Because of its branched structure, it closely resembles amylopectin (the branched fraction of plant starch) and glycogen (animal starch). In contrast, cellulose is an unbranched beta-(1->4)-glucan.
NCERT explicitly states: "The food is stored as floridean starch which is very similar to amylopectin and glycogen in structure."
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect; cellulose is an unbranched linear beta-1,4-glucan forming rigid fibrils, completely distinct from branched floridean starch.
Factually exact; both are branched alpha-glucans structurally analogous to floridean starch.
Incorrect; mannitol is a sugar alcohol and algin is a phycocolloid, both characteristic of Phaeophyceae (brown algae), not floridean starch analogues.
Incorrect; laminarin is a beta-1,3-glucan stored in brown algae, not structurally similar to floridean starch.
Green algae = Starch. Brown algae = Laminarin & Mannitol. Red algae = Floridean starch (similar to AMYLOPECTIN and GLYCOGEN).
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