Question

chloroplasts have stacks of internal membranes called that contain chlorophyll.

Explanation:

Chloroplasts are organelles in plant cells. The stacks of internal membranes in chloroplasts that contain chlorophyll are called grana. Each granum (singular of grana) is made up of thylakoids. Chlorophyll is the pigment that captures light energy for photosynthesis.

Answer:

grana