Some Plants Extract and Concentrate Heavy Metals from the Soil

Multiple Choice

Some plants extract and concentrate heavy metals from the soil. A current use for such plants is

A) to help locate suitable sites for toxic waste storage.
B) to concentrate rare metals for medicinal use.
C) to minimize soil erosion in arid lands.
D) nitrogen fixation by symbiotic bacteria in root nodules.
E) photoremediation of polluted sites.