MARILYN SCHALLER / SCIENCE PHOTO LIBRARY MARILYN SCHALLER / SCIENCE PHOTO LIBRARY
Chloroplasts. Transmission electron micrograph (TEM) of a section through a leaf mesophyll cell showing its chloroplasts. Dark staining lipid droplets or carbohydrate granules can be seen in the stroma, or matrix, of one of the chloroplasts. The pale area at upper left is a vacuole, while part of the cell wall can be seen at lower right. The chloroplasts carry out photosynthesis, the production of sugars using sunlight. The part of the process that requires light occurs in the ribbon-like grana membranes. This cell is from a resurrection plant (Selaginella lepidophylla), a type of spike moss which grows in the desert. Magnification: x10,000 at 7.5x8 inch size.
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