In addition to providing support to the pigment thylakoids, the stroma are now known to contain chloroplast DNA, starch and ribosomes along with enzymes needed for Calvin cycle. Thylakoids are usually arranged in stacks (grana) and contain the photosynthetic pigment (chlorophyll). Stromal thylakoids are helicoid sheets that spiral around grana and interlinks the granum. Grana are connected by stroma thylakoids, also called intergranal thylakoids or lamellae. Grana are connected to each other by intergranal lamellae. Chloroplasts can have from 10 to 100 grana. Inside the stroma, there are grana as well as the sub-organelles in which the process of photosynthesis is initiated before the chemical deviations are accomplished in the stroma. Grana are a necessary part of the process of photosynthesis. A granum (plural grana) is a stack of thylakoid discs. A granum (plural grana) is a stack of thylakoid discs. Grana is the singular form and the plural form is granum. Grana thylakoids, that are the part of grana. Stroma indicates the colorless fluid that is surrounding the grana inside the chloroplast. The protein compositions of the stacked grana and the unstacked stroma lamellae are strikingly different (reviewed in ).Photosystem II and its associated integral membrane chlorophyll a/b binding light-harvesting complex (LHCII) are overwhelmingly concentrated in the grana. Membranes contain chlorophyll pigments and electron transport proteins that comprise the photosystems Light dependent reactions occur (photosynthesis) occur in the grana The stroma is the fluid within the inner chloroplast membrane and outside of the thylakoid. Grana thylakoids are pancake-shaped circular disks about 300â600 nanometers in diameter. Chloroplasts can have from 10 to 100 grana. Grana thylakoids and stroma thylakoids can be distinguished by ⦠Stromal thylakoids, which are in contact with the stroma. Stroma Definition â Meaning of Stroma Stroma is the fluid filling up the inner space of the chloroplasts which encircle the grana and the thylakoids. The grana are connected to other stacks by simple membranes (lamellae) within the stroma, the fluid proteinaceous portion containing the enzymes essential for the photosynthetic dark reaction, or Calvin cycle. Photosystem I is excluded from the tightly appressed regions of the ⦠The matrix or stroma fills most of the volume of the chloroplasts and is a kind of gel-fluid phase that surrounds the thylakoids (grana). Grana are connected by stroma thylakoids, also called intergranal thylakoids or lamellae. Stroma. Granum is the site of light reaction during photosynthesis while stroma is the site of dark reaction. Grana is the disc-like plates embedded in the stroma of the chloroplast. 2. 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