Question

what are stacks of thylakoids in chloroplasts called?
a. photosystems
b. stroma
c. photons
d. grana

Explanation:

In chloroplasts, stacks of thylakoids are known as grana. Photosystems are complexes involved in photosynthesis, stroma is the fluid - filled space in chloroplasts, and photons are particles of light.

Answer:

D. Grana