Queried GO terms:

  idGO:0048046   Detailed information
  nameapoplast
  namespacecellular_component
  def"The cell membranes and intracellular regions in a plant are connected through plasmodesmata, and plants may be described as having two major compartments: the living symplast and the non-living apoplast. The apoplast is external to the plasma membrane and includes cell walls, intercellular spaces and the lumen of dead structures such as xylem vessels. Water and solutes pass freely through it." [GOC:jid]
  xrefWikipedia:Apoplast
  is_aGO:0005576 ! extracellular region

Monarch genes with this GO terms:

  DPGLEAN22308