Certified Arborist Test 2025 – 400 Free Practice Questions to Pass the Exam

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What role does lignin play in plant cells?

It helps in photosynthesis

It provides durability and rigidity to cell walls

Lignin is a complex organic polymer found in the cell walls of many plants, and its primary role is to provide durability and rigidity to these walls. This structural component enhances the mechanical strength of the plant, allowing it to withstand various stresses such as wind and gravity. The presence of lignin helps in the formation of wood and bark, contributing to the overall support and stability of the plant structure. Additionally, lignin is crucial for regulating water transport within the plant by reinforcing the cell walls, thus aiding in the plant's ability to maintain turgor pressure. The other options describe functions that are not related to lignin; for instance, photosynthesis is primarily conducted by chlorophyll, and nutrient uptake is primarily facilitated by root structures rather than lignin itself.

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It attracts pollinators

It is important for nutrient uptake

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