Question

what structure is described as a network of interconnected sacs that fill chloroplasts? intermembrane space thylakoids stroma

Explanation:

To solve this, we analyze each option:

• Intermembrane space: Found in mitochondria (between inner and outer membranes), not in chloroplasts as interconnected sacs.
• Thylakoids: These are flattened, interconnected sacs (or disks) that form a network (grana when stacked) within chloroplasts, where photosynthesis' light - dependent reactions occur.
• Stroma: The fluid - filled space surrounding thylakoids in chloroplasts, not the interconnected sacs.

Answer:

B. thylakoids