amyloplast with slarch grains chloroplast nucleus endoplasmic reticulum (ER chlorop asts with grana embedded in stroma piasmodesma. vacuolar membrane cell walls with middle lamella between Golgi apparalus Figure P-2 A generalized plant cell.The drawing is based on the appearances of cellular plasma membrane organelles in electron micrographs.(W.A. Jensen and F B.Salisbury,1984,Botany.p.46.)