Problem 1: Location of Photosynthesis Photosynthesis occurs within the __________ of a plant cell. A. nucleus B. mitochondria C. chloroplast D. vacuole Tutorial Photosynthesis occurs in the chloroplast, an organelle within plant cells. Chloroplasts contain stacks of thylakoid membranes (sometimes called grana). These are visible in the transmission electron micrograph. Embedded within these thylakoid membranes are chlorophyll and other photosynthetic pigments. The thylakoid membranes are suspended within the chloroplast by stroma, a protein rich fluid. The vacuole is an organelle filled with water and other water-soluble molecules. Water within the vacuole provides turgor, or stiffness. When plants lack adequate turgor pressure, they wilt. The nucleus is an organelle that contains the cell's genetic material. The mitochondria are organelles involved in metabolizing sugars to release energy. < Problem 1 | Answer | Problem 2 >

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