Select targeted languages. 1  Catalan: fre m. 2  Chinese: Mandarin: ç¹«å¸¶ (zh), ç³»å¸¦ (zh) (jÃ¬dÃ i) 3  Finnish: frenulum. 4  Galician: freo (gl) m. 5  Greek: ÏÎ±Î»Î¹Î½ÏÏ (el) m (chalinÃ³s) 6  Icelandic: haft n. 7  Inuktitut: á¿áªááá (qillutaq)
Thylakoids float in the liquid filling the chloroplast, called the stroma. The part of the Thylakoids between two Grana is called a Lamella. Most importantly, they are the sites of the light-dependent reactions, which occur in the first step of photosynthesis.
The stroma is the fluid-filled space that is surrounding the grana, and is also involved in the synthesis of organic molecules from water and carbon dioxide. After the thylakoids, the process of producing starch or sugar moves out to the stroma.