Final answer:
Ultrasound is used to visualize the internal structures of a generalized plant cell by reflecting off boundaries within the cell to create images.
Step-by-step explanation:
The purpose of ultrasound in studying a generalized plant cell is primarily to visualize the internal structures of the cell. Unlike light microscopy, ultrasound imaging can penetrate samples and reflect off boundaries within the cell to create an image of its interior architecture, which helps in understanding the arrangement and condition of cellular organelles and structures. For more detailed cellular studies, especially at the sub-cellular level, electron microscopy would be necessary as it provides much higher resolution imaging.