Answer the following question given this paragraph: 

In plants and algae, photosynthesis takes place in organelles called chloroplasts. Chloroplasts contain stacks of membranes called thylakoids, which contain chlorophyll. Thylakoids are surrounded by a fluid-filled space called stroma.


Q: In plants and algae, photosynthesis takes place in which organelles?

 Choices:

- stems

- fibroblasts

- cells

- chloroplasts

A:
chloroplasts
