Sclereids are a type of plant cell known for their hard, woody structure. They provide support and protection to various plant tissues. Sclereids can be found in many parts of plants, including seeds, fruits, and leaves, contributing to the overall strength and durability of these structures. These cells are often irregularly shaped and can vary in size. Unlike other supportive cells, such as fibers, sclereids are typically shorter and more varied in form. Their presence is particularly notable in the gritty texture of pear fruits and the hard shells of nuts, where they help deter herbivores and protect the plant's reproductive structures.