The main purpose is protection. The lipid bilayer protects the cell from viruses and other threats to the cell. It also maintains homeostasis within the cell by monitoring the amount of substances the enter or exit the cell.
A light microscope, I don't think it would be an electron microscope because we're talking about PRESERVED plant cells.
To gather data or information or to observe. HOPE THIS HELPS!! IF SOO LET ME KNOOW
