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

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What does the term "reaction wood" refer to in trees?

Wood produced in response to stress

The term "reaction wood" refers to the specialized wood that trees produce in response to mechanical stress, such as leaning or bending due to wind or gravitational forces. This adaptation helps trees stabilize themselves and maintain their upright posture. In conifers, the reaction wood is known as compression wood, which forms on the underside of a leaning stem and has denser fibers, providing additional strength. In hardwoods, it is called tension wood, which forms on the upper side of the lean and exhibits different characteristics that help the tree counteract the stress.

Understanding reaction wood is crucial for arborists as it provides insight into tree health and structure. This adaptation indicates how a tree is responding to its environment, which can affect its growth patterns and overall stability.

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Wood that shows signs of decay

Wood that is used for structural support

Wood that is more resistant to pests

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