The images seen under the microscope are inverted images, including upside down and upside down. As can be seen from the figure, the flow direction of the cytoplasm of the object seen under the microscope is counterclockwise, and according to the characteristics of the inverted image, the actual flow direction of the cytoplasm of the black algae is also counterclockwise; Microscopically, colored organelles are only chloroplasts and vacuoles are colorless.

Therefore, choose: B.