Euglena move by a flagellum (plural ‚ flagella), which is a long whip-like structure that acts like a little motor. The flagellum is located on the front end, and twirls in such a way as to pull the cell through the water. Color the reservoir grey and the flagellum black. Chloroplasts within the Euglena trap sunlight that is used for photosynthesis, and can be seen as several rod-like structures throughout the cell.