Growth rings in timber correspond to what feature?

• A. Annual rings of wood
• B. Cross-grain patterns
• C. Variations in grain direction
• D. Pollen layers in the wood

Answer: (A)

Growth rings in timber are annual rings of wood. Each year the tree’s cambium forms a complete layer as it grows, so one ring represents one year of growth. In temperate climates, spring growth creates lighter, wider earlywood, followed by darker, denser latewood in summer or fall, and together they form the visible ring. You can count these rings to estimate the tree’s age, and the width of the rings reflects growing conditions—wide rings mean favorable conditions, narrow rings indicate stress or limited resources. This concept is distinct from cross-grain patterns or variations in grain direction, which describe fiber orientation, and from pollen layers, which are not how growth rings are formed.