Final answer:
In photosynthetic eukaryotes, such as plants, the internal system of membranes responsible for photosynthesis is called the chloroplast. Chloroplasts contain two membranes and a third membrane within the chloroplast that forms stacked structures called thylakoids. Thylakoids contain chlorophyll and are responsible for absorbing light during photosynthesis.
Step-by-step explanation:
In photosynthetic eukaryotes, such as plants, the internal system of membranes responsible for photosynthesis is called the chloroplast.
Chloroplasts contain two membranes, an outer membrane and an inner membrane. They also have a third membrane within the chloroplast that forms stacked structures called thylakoids. These thylakoids contain chlorophyll, which is responsible for absorbing light and starting the process of photosynthesis. The thylakoid membrane encloses an internal space called the thylakoid lumen. Stacks of thylakoids are called grana, and the liquid-filled space surrounding the grana is called stroma.