Florence Meier Chase, 75, a former associate plant physiologist with the Smithsonian Institution, died May 6 at a hospital in Manahawkin, N.J. She suffered from hardening of the arteries.

Mrs. Chase moved from Washington to Harvey Cedars, N.J., in 1970.

She worked in the division of radiation and organisms at the Smithsonian from 1930 to 1941, and wrote a number of monographs on ultraviolet light and algae, which were published by the Smithsonian.

She then assisted her husband, Dr. William W. Chase, in his work on articles for scientific and medical publications. Dr. Chase, who had been chairman of the old Garfield Memorial Hospital's surgery department, died in 1957, shortly after he was elected chairman of the surgery department of the new Washington Hospital Center.

Mrs. Chase was born in Springfield, Ill. A graduate of Wellesley College, she earned a doctor of science degree from the University fo Geneva in Switzerland. She was a research assistant to the head of the botany department at Columbia University before coming to Washington in 1930.

She was a fellow of the American Association for the Advancement of Science and an honorary member of the Washington Botanical Society.

Mrs. Chase had been active in the Opti-Mrs. Club of Washington, the Women's Medical Auxiliary of the D.C. Medical Society, the Women's Medic Auxiliary of the Southeastern Surgical Association, the Shepherd Park Citizens Association and North-minister Presbyterian Church.

She is survived by a son, William W. Jr., of Harvey Cedars; a sister, Dr. Lois Shoemaker, of Trenton, N.J., and three grandchildren.