Here's why:
* Parenchyma cells are the most common type of plant cell. They are relatively simple, with thin cell walls and large vacuoles. They are involved in a variety of functions, including storage, photosynthesis, and wound healing.
* Pith is the central core of a stem or root. It is typically composed of loosely packed parenchyma cells that store food and water.
While parenchyma cells are the primary component, the pith may also contain other cell types in smaller amounts, such as:
* Collenchyma cells: These cells provide structural support, particularly in young stems.
* Sclerenchyma cells: These cells are thick-walled and provide more rigid support. They may be present in the pith of some plants, especially older ones.
So, in essence, the pith is mostly made up of parenchyma cells, but it might also contain other cell types depending on the plant species and its developmental stage.
