What is a lenticel?

A lenticel is a specialized structure found in the bark of young trunks and branches of trees and shrubs. It serves as a pore that facilitates gas exchange between the internal tissues of the plant and the external environment. This is particularly important for plants as they need to take in oxygen for respiration and release carbon dioxide. Lenticels typically appear as small, slightly raised, or elongated spots on the bark and are more prevalent in younger trees where the bark is still relatively smooth.

In contrast, other options describe different plant structures or functions. For instance, a type of leaf structure refers to parts of leaves such as stomata or veins, which are distinct from lenticels. A flexible branch of a tree describes a portion of the tree's physical structure but does not encompass the function and characteristics of a lenticel. The root system involves parts of the plant that anchor it and absorb water and nutrients, which does not relate to the function of lenticels. Understanding the role of lenticels is crucial for recognizing how trees manage gas exchange, particularly in the context of their growth and health.