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Cell wall (plant) A thick, rigid membrane that surrounds a plant cell. This layer of cellulose fiber gives the cell most of its support and structure. The cell wall also bonds with other cell walls to form the structure of the plant. Chlorophyll (plant) The green pigment in the leaves and stems of plants that is necessary for the production of plant food by photosynthesis. Chloroplast (plant) An elongated or disc-shaped organelle containing chlorophyll.
Inside a Plant Cell. The cell is the basic unit of lifeâthe building block for all plants and animals on the planet. Plant cells are eukaryotic, which means that they contain a distinct nucleus.Plant cells have three unique structures which set them apart from other eukaryotes, such as animal cells: the cell wall, plastids, and vacuoles.Plant cells are microscopic in size (on the order of 0.01 to 1.0 mm.).lant cells are eukaryotic, which means that they contain a distinct nucleus. Plant cells have three unique structures which set them apart from other eukaryotes, such as animal cells: the cell wall, plastids, and vacuoles. Plant cells are microscopic in size (on the order of 0.01 to 1.0 mm.).