stroma
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chlorophyll is present in grana in chloroplast.(grana are sacs of thylakoid coiled upon eachother just like coins)
The stroma is the fluid-filled space inside the chloroplast that surrounds the thylakoid membranes. It contains enzymes responsible for the Calvin cycle, where carbon dioxide is fixed and converted into sugars. The stroma also plays a role in various metabolic pathways within the chloroplast.
Grana are stacks of thylakoids.
The fluid region of the chloroplast is known as the stroma. It is a semi-liquid substance that fills the space between the thylakoid membranes and surrounds the thylakoid stacks called grana. The stroma contains enzymes and other molecules that are involved in the synthesis of carbohydrates during the process of photosynthesis.
In a chloroplast, the stacks of membranous sacs are called thylakoid membranes. Grana is the term used to refer to the stacks of thylakoids. It is in this internal part of the chloroplast where photosynthesis occurs.