Which from following molecules serves as fibrous content of food only and useful for bowel movement in humans?

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Cellulose is a straight-chain polysaccharide composed of $β$ -D-glucose units. Humans lack the enzymes, such as cellulase, required to break the $β$ -glycosidic linkages in cellulose. As a result, it cannot be digested or absorbed as a nutrient.

Instead, cellulose passes through the human digestive system largely intact, serving as dietary fiber or roughage. This fibrous content adds bulk to the stool and is essential for maintaining healthy bowel movements.

In contrast, amylose and amylopectin (components of starch) and glycogen are readily digested by humans to provide energy.

Answer: Cellulose

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