Substance of Plant Cell Walls
This page is the CodyCross answer for the clue below from Farm, Group 477, Puzzle 4 (Plants and Livestock).
Question is: Substance of Plant Cell Walls
and the answer is: CELLULOSE
Word Meaning:
CELLULOSE — A complex carbohydrate that forms the main constituent of the cell wall in most plants and is important in the manufacture of numerous products, such as paper, textiles, pharmaceuticals, and explosives.
Definitions from Wiktionary.