Both grana and stroma are:

Thylakoids are disc-shaped structures present in the chloroplast. They stack up to form the grana. Thylakoids are the sites for oxygenic photosynthesis in eukaryotic plants and algae.

What are grana and stroma?

  1. Grana are stacks of membrane-bounded, flattened discoid sacs called thylakoids containing the molecules of chlorophyll. They are the main functional units of chloroplasts.
  2. Stroma is the homogenous matrix in which grana are embedded. The stroma contains a variety of photosynthetic enzymes, starch grains, DNA and ribosomes.
  3. Granum is the site of the light reaction during photosynthesis while stroma is the site of dark reaction.

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