Question

question 21
suspended in the fluid stroma of chloroplasts are?
a. none of the above
b. small metallic disks that provide energy
c. pyruvate
d. stacks of thylakoids called grana
e. mitochondria

Explanation:

Chloroplasts have a fluid - filled stroma. Thylakoids are membrane - bound compartments within chloroplasts. Stacks of thylakoids are called grana, and they are suspended in the stroma. Pyruvate is involved in cellular respiration (in the cytoplasm and mitochondria), not chloroplast structure. Mitochondria are separate organelles for cellular respiration. Metallic disks are not a part of chloroplast structure related to this description.

Answer:

D. stacks of thylakoids called grana