Dr. Zamora is recognized for his contributions to plant anatomy-morphology, pteridophyte biology, and the conservation of environment and natural resources policy research. His work on the xylem elements of vascular plants is the basis for the formulation of the two-phase wall deposition concept now accepted universally. His studies on the taxonomy of Philippine ferns led to the discovery for more species of the group.

Dr. Zamora was a Rockefeller Foundation fellow at Cornell University (1961-1965), NSF Research grantee (1962-1965) and UP Professorial Chair holder (1977-1980).