Answer:
1. Cellulose, a tough, fibrous, and water-insoluble polysaccharide, plays an integral role in keeping the structure of plant cell walls stable.
2. Cellulose is the main substance in the walls of plant cells, helping plants to remain stiff and upright.
3. Humans cannot digest cellulose, but it is important in the diet as fibre.
4. The major sources of cellulose are plant fibers (cotton, hemp, flax, and jute are almost all cellulose) and, of course, wood (about 42 percent cellulose).
Explanation:
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