The photosynthetic membranes are found in the in plant cells.

Chloroplast

Explanation:

The process of photosynthesis occurs in a type of compartmentalized organelle called chloroplast which is present in plant cells. Inside the chloroplast photosynthetic membrane is present which are called thylakoids.

These thylakoids have many pigments like chlorophyll, carotenoids, etc which are responsible for capturing sunlight and carry out light-dependent reaction to produce food in the form of glucose.

This membrane also contains many proteins that helps to carry out electron transport and the formation of ATP. Therefore the correct answer is chloroplast.

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