Parenchyma cells: These are the most common type of cell in stems. They are round or irregularly shaped and have thin cell walls. They function in storage, photosynthesis, and support.
Collenchyma cells: These cells are elongated and have thickened cell walls, often at the corners. They provide flexible support to growing stems.
Sclerenchyma cells: These cells are thick-walled and often dead at maturity. They provide rigid support and strength to the stem. There are two types:
* Fibers: These cells are long and narrow, resembling tiny threads.
* Sclereids: These cells are shorter and more irregularly shaped.
Vascular tissues: These tissues include xylem and phloem, which are responsible for transporting water and nutrients throughout the plant. Their cells are specialized and often elongated to facilitate efficient transport.
Epidermis: The outer layer of cells in the stem is called the epidermis. These cells are flattened and tightly packed, forming a protective layer.
In summary, the shape of cells in stems is diverse, reflecting their varied functions in supporting and nourishing the plant.
