1. Examine the video link. The cell will appear rectangular due to the rigid border of each cell known as the cell wall. The numerous green circular structures inside are the chloroplasts. Chloroplasts are the site of photosynthesis. As the light warms the slide, the chloroplasts appear to circle around the central vacuole (see video link above). This is called cyclosis or cytoplasmic streaming. 2. Draw two Elodea cells in the space below. Label the cell wall and chloroplasts