Tonoplast: In plant cell, the vacuole is bound by a single membrane called tonoplast. The tonoplast facilitates the transport of ions and other material against the concentration gradient into the vacuole. Hence, their concentration is higher in the vacuole than in the cytoplasm.
The outer membrane of mitochondria is formed of porin proteins and inner membrane bounds of chloroplast the stroma. The cell membrane of the plant cell is not a tonoplast. It is simple biological/unit membrane present in every cellular organism.