Stacks of granum are connected to each other by

Lamellae

Explanation:

Chloroplasts are plant (also found in algae) organelles in which photosynthesis occurs. These structures contain pigments (such as chlorophyll) that have the ability to absorb light energy and convert it to sugars necessary for the growth and development of the plant.

Structure of the chloroplast: They are disc-shaped with outer and inner membranes and intermembrane space between them. Inside the chloroplast there is a fluid-filled space called stroma. Stroma contains membrane discs – thylakoids that are arranged in interconnected stacks called grana. In the thylakoid membrane is chlorophyll and inside the thylakoid disc is the space called the thylakoid space.

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