What role does cellulose play in tree health?

Cellulose is a polysaccharide that forms the structural component of plant cell walls, providing rigidity and strength to trees. Its role in tree health becomes particularly significant when considering how trees interact with their environment, including the presence of fungi. When fungi invade a tree, they produce enzymes that break down cellulose, leading to decay. This process weakens the tree and can ultimately compromise its health and stability. Consequently, the presence of cellulose is directly linked to a tree's vulnerability to decay caused by fungal infections.

Other options, while related to tree health, do not accurately describe the specific role of cellulose. Cellulose does not serve as an energy source; rather, trees primarily utilize carbohydrates, such as glucose, for energy. It also does not directly support photosynthesis, which occurs in the chloroplasts of leaves, utilizing chlorophyll to convert light energy into chemical energy. While cellulose can contribute to pest resistance by forming a tough outer barrier, this is a more indirect relationship compared to its critical role in decay due to fungi.