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Only plant cells and a select handful of other organisms are able to produce energy from sunlight. The structure found inside plant cells and these organisms that allows them to absorb sunlight is called a chloroplast.
Chloroplasts are a green cell organelle that is instrumental in converting sunlight into carbohydrate energy. Inside chloroplasts, a structure called a thylakoid is filled with a pigment called chlorophyll. Chlorophyll is the reason plants appear green. A stack of thylakoid structures inside a chloroplast is called a granum.
Without choroplasts, plants could not undergo photosynthesis and would be unable to produce energy from the sun.