Stacks of thylakoids in chloroplasts is known as Grana.
What is chloroplast?
Chloroplast is a plant cell organelles which convert light energy into relatively stable chemical energy by the process of photosynthesis.
Chloroplasts are present in all higher plants. It is biconvex or oval, present within the mesophyll in the plant cell. The size of the chloroplast usually differs between 4-7 µm in diameter and 1-4 µm in thickness. They are double-membrane organelle. With the presence of outer, inner and inter-membrane space. There are two different regions found inside a chloroplast called as the grana and stroma.
Grana are formed up of stacks of disc-shaped structures called thylakoids. The grana of the chloroplast comprises of chlorophyll pigments and is the functional units of chloroplasts.
Stroma is the similar matrix that contains grana and is similar to the cytoplasm in cells in which all the organelles are present in the cell. Stroma also possess various enzymes, ribosomes, DNA, and other substances. Stroma lamellae act by connecting the stacks of thylakoid grana.
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