Mitochondria and chloroplasts are similar because they both:

Mitochondria and chloroplasts are similar because they both contain their own DNA and have the ability to reproduce independently of the cell in which they are found. This characteristic is a key aspect of the endosymbiotic theory, which suggests that these organelles originated from free-living prokaryotic organisms that were engulfed by ancestral eukaryotic cells.

Both organelles have double membranes and share similarities with bacterial structures, further supporting their independent genetic material and reproduction. Mitochondria are responsible for cellular respiration, while chloroplasts are involved in photosynthesis; however, their shared trait of containing their own DNA and reproducing independently highlights their evolutionary significance and functional autonomy in the metabolic processes of the cell. This unique feature sets them apart from other organelles that do not have their own DNA.