See the below image for the Cross section of a plant cell diagram. CROSS SECTION OF A LEAF. Spongy Mesophyll: These cells are smaller than those of the palisade mesophyll and are found in the lower part of the leaf. They also contain chloroplasts, but not quite as many. These cells have large air spaces between them that allow carbon dioxide and oxygen to diffuse between them.
The parts of a plant cell and plant cell components, which will be discussed, are plant cell wall, plant cell membrane, smooth endoplasmic reticulum, ribosomes, rough endoplasmic reticulum, vacuole, nucleus, peroxisomes, Golgi apparatus, mitochondria, cytoplasm, cytoskeleton, and plastids. The outermost portion of a plant cell is the cell wall.
It is located outside the cell membrane. It comprises proteins, polysaccharides and cellulose. The primary function of the cell wall is to protect and provide structural support to the cell. The plant cell wall is also involved in protecting the cell against mechanical stress and to provide form and structure to the cell.