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Plant cell structure, illustration. Cross-section through a typical plant cell. Plant cells differ from animal cells in that they have a cell wall (green surrounding border) and have chloroplasts (green ovals circling the cell). Chloroplasts contain a pigment, chlorophyll, which is used in photosynthesis - the process which converts the energy from sunlight into chemical energy which the plant uses as food in the form of glucose. Plant cells also contain large vacuoles (liquid and gas-filled space, blue), and a nucleus (purple, centre right) which contains a nucleolus (pink sphere). Mitochondria (blue ovals) are energy-producing organelles where cellular respiration takes place.