Dear student.
Sclerenchyma
The structure of these cells are roughly spherical, although it may vary considerably in size and shape, the primary cell wall is thickened with the deposits of lignin.
Their main function is to provide mechanical support so that the plants remain upright and erect. But a strong wind or storm can exert too much force, which can either break the stem or can uproot the plants from the soil.
Regards.