Here's why:

* Double membrane: Chloroplasts have an outer membrane and an inner membrane, creating two distinct layers.

* Light energy capture: Chloroplasts contain chlorophyll, a pigment that absorbs light energy from the sun.

* Chemical conversion (photosynthesis): Chloroplasts use the captured light energy to power the process of photosynthesis, converting carbon dioxide and water into glucose (sugar) and oxygen.

Let me know if you have any other questions!