Chloroplasts are another type of double-membraned organelle found in the cells of plants and algae. They're responsible for photosynthesis, the process by which light energy is converted into chemical energy in the form of glucose. Chloroplasts contain chlorophyll, a green pigment that absorbs light energy from the sun, as well as other pigments and enzymes involved in photosynthesis.Like mitochondria, chloroplasts also have their own DNA and ribosomes, supporting the theory that they were once free-living photosynthetic bacteria that were engulfed by ancestral eukaryotic cells. Through the process of endosymbiosis, these bacteria formed a symbiotic relationship with their host cells, eventually evolving into the chloroplasts we see today.
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