Certified Arborist Practice Exam

Which tree has needles that grow in pairs of two, three, and five?

1. Elm tree

2. Pine tree

3. Spruce tree

4. Ash tree

The correct answer is: Pine tree

The correct choice is the pine tree, characterized by its needle-like leaves that typically grow in bundles, known as fascicles. Depending on the species, pine needles can be found in clusters of two, three, or five, which is a distinctive feature that helps with species identification. This adaptation allows them to withstand various environmental conditions, as the bundled needles reduce surface area, minimizing water loss. In contrast, elm trees have broad leaves that are not needle-like, while spruce trees typically have individual needles that are sharply pointed and are not grouped in bundles. Ash trees also feature broad, compound leaves, lacking the needle structure entirely. The unique grouping of pine needles in pairs, threes, or fives is a defining characteristic that supports the identification of pine trees among these other species.