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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.
It is made of cellulose, mucopolysacharides and muco-peptides. Cell membrane/plasma membrane: This is the outer covering of cell. In plant cells it is present just below the cell wall while in animal cell, it forms the outer most cover. It encloses entire cell and its organelles. It is a selectively permeable, flexible layer of the cell.