When a specimen is to be observed under the light microscope, scientists usually stain the specimens using different type of chemical stains depending on the type of specimen to be observed. Staining of specimen make the structures that are to be observed in the specimen very visible under the microscope, this make it easy for scientists to observe their structures.
Plant cells have a large central vacuole because a plant cells requires much more water to function. Vacuoles in animal cells can store water, but they mainly store waste or nutrients