Which type of plants are characterized by a significant presence of lignin in their cell walls?

Woody plants are characterized by a significant presence of lignin in their cell walls. Lignin is a complex organic polymer that binds to cellulose and helps to provide strength and rigidity, which is essential for the structural integrity of these plants. This feature allows woody plants, such as trees and shrubs, to grow tall and withstand various environmental stresses, including wind and the weight of their branches and leaves.

In contrast, herbaceous plants tend to have softer, more flexible tissues with little to no lignin, making them less sturdy and usually unable to survive extreme weather conditions. Deciduous plants, which lose their leaves seasonally, can include both woody and herbaceous types, but the presence of lignin specifically relates to their structure rather than their seasonal habits. Annual plants typically complete their life cycle in one growing season and may not develop the lignified tissues that characterize woody plants. Therefore, the definition and traits specific to woody plants confirm why they are identified by a high lignin content.