<prompt> Replacement of columnar epithelium in respiratory tract to squamous epithelium is -HyperplasiaHypoplasiaNone of the aboveMetaplasia  <response>: Metaplasiao Metaplasia is a reversible change in which one differenated cell type is replaced by another differenated cell type.o Metaplasia represents an adapve substuon of cells that are sensive to stress by cell types beer able to withstand the adverse environment,o Metaplasia may be of two types 