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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.
The outermost structure of a plant cell is a cell wall. Plant cells have cell walls for extra protection as they cannot move like animals and protists, whose outermost cell st â¦ ructure is the cell membrane, a thinner protective cover. 2 people found this useful.