Q. A netlike membranous complex of superposed flat saccules with vesicles detaching from the extremities seen in electronic microscopy. What is the observed structure? What is its biological function?

What is being observed is the Golgi apparatus or Golgi complex. This cytoplasmic organelle is associated with chemical processing and modification of proteins made by the cell and with storage and branding of these proteins for posterior use or secretion, Vesicles seen under the electronic microscope contain material already processed, ready to be exported (secreted) by the cell. The vesicles separated from the Golgi apparatus, travel across the cytoplasm and fuse with the plasma membrane then secreting their substances to the exterior.