Articles > Chloroplast definition – quiz Chloroplast definition – quiz Quiz Choose the best answer. 1. The organelle involved primarily in photosynthesis Nucleus Mitochondria Chloroplast 2. Green pigment Chlorophyll Chromoplast Chloroplast 3. Disk-shaped structures collecting photons from sunlight Chloroplast DNA Thylakoids Stroma 4. Where light-independent reactions of photosynthesis occur Inner chloroplast membrane Thylakoids Stroma 5. Gas produced as a byproduct of photosynthesis Carbon dioxide Oxygen Nitrogen Send Your Results (Optional) Your Name To Email Time is Up!