Which type of cell has very thick cell walls containing lignin?

Sclerenchyma cells are known for their thick and rigid cell walls that contain lignin, which is a complex organic polymer. Lignin provides structural support and strength to the plant, making these cells essential for maintaining the integrity of various plant organs. Sclerenchyma cells typically function to support and protect the plant, especially in regions where strength is necessary, such as stems and vascular tissues. They can be found in the form of fibers or sclereids and are usually dead at maturity, which contributes to the sturdiness of the plant.

In contrast, meristematic cells are involved in growth and division, parenchymal cells are more versatile and involved in storage and photosynthesis, and collenchyma cells, while providing flexible support, have cell walls that are not as thick or lignified as those of sclerenchyma. This distinction in function and structure is key in understanding the role of different plant cell types.