How the structures of glycogen, starch and celluloseWatch
Cellulose - consists of many straight chains (running anti-parrallel) which the glucose are inverted because it is made of beta glucose (with a different position of the hydroxyl group on carbon 1 compared to alpha glucose). The chains are linked by hydrogen bond, which forms microfibrils providing strong support (due to its rigidity). Beta glucose forms a strong glycosidic bond, which cannot be broken down by amylase.
Starch - many chains unbranched of alpha glucose which coils into a helix (hydrogen bonds form between each chain) to form a compact shape, so harder to hydrolyse. Moreover, they are insoluble so does not affect the water potential of plant cells.
Edit: this is all I can remember from my AS Biology exam