Chloroplasts are disk-shaped organelles found in which cells?

• A. Animal cells.
• B. Bacterial cells.
• C. Fungal cells.
• D. Plant cells.

Answer: (D)

Chloroplasts are the site of photosynthesis, the process plants use to convert light energy into chemical energy. They are characteristic of plant cells (and some algae) and are typically disk-shaped with their own DNA, reflecting their ancient origin from cyanobacteria. Because photosynthesis is essential for plants to make glucose and oxygen, chloroplasts appear in plant cells and in algae, but not in animal or fungal cells. Bacteria are prokaryotes and don’t have chloroplasts, though some have other photosynthetic membranes. So, chloroplasts are found in plant cells.