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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.
Cell Wall (plant cells only) : Plant cells have a rigid, protective cell wall made up of polysaccharides. In higher plant cells, that polysaccharide is usually cellulose. The cell wall provides and maintains the shape of these cells and serves as a protective barrier.hloroplast (plant cells only) : Chloroplasts are specialized organelles found in all higher plant cells. These organelles contain the plant cell's chlorophyll responsible for the plant's green color and the ability to absorb energy from sunlight.