Ace the Certified Arborist Test 2025 – Branch Out and Leaf Your Mark!

Lignin is a key component of plant cell walls and plays an essential role in providing rigidity and structural integrity to the tree. It is a complex organic polymer that reinforces the cell walls, especially in woody plants, helping them withstand various stresses such as wind and heavy loads. During the decay process, microorganisms break down plant tissues, and lignin serves as a protective barrier, slowing down the decomposition of cellulose and allowing the tree to maintain its structural stability for a longer time.

Phloem is primarily involved in the transport of nutrients, while cellulose provides structural support but is more susceptible to decay. Fruiting bodies are manifestations of fungi and are not involved in maintaining tree structure. Understanding the role of lignin highlights its importance in a tree's resilience against decay and its ability to support the overall structural integrity of the organism.