Question

what fluid fills the intermembrane space of chloroplasts?
stroma
ribosomes
dna

Explanation:

To solve this, we analyze each option:

• Ribosomes are organelles for protein synthesis, not a fluid.
• DNA is genetic material, not a fluid.
• Stroma is the fluid - filled space within the chloroplast's inner membrane system (the intermembrane space - related region here has stroma - like fluid context, and stroma is the fluid that fills the chloroplast's internal space including the intermembrane - associated regions in terms of chloroplast structure).

Answer:

stroma