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Answer;-They are the sites of reactions that convert solar energy into chemical energy.-They contain the green pigment chlorophyll.-They have membranous sacs called thylakoids that are surrounded by a fluid called stroma.Explanation;-Chloroplasts are organelles found in plant cells, that work to convert light energy of the Sun into sugars that can be used by cells. The entire process is called photosynthesis and it all depends on the little green chlorophyll molecules in each chloroplast.-The chloroplasts have inner and outer membrane with an empty intermediate space in between. Inside the chloroplast are stacks of thylakoids, called grana, as well as stroma, the dense fluid inside of the chloroplast. Thylakoids contain the chlorophyll, which is a green pigment that is necessary for the plant to go through photosynthesis....