In the phytomining process, what do plants absorb?

In phytomining, plants are specifically used to absorb metal compounds from the soil through their roots. This process is beneficial for extracting valuable metals from low-grade ores or contaminated land. The plants take up these metal ions, which can include elements like copper, nickel, or gold, and concentrate them in their biomass.

When the plants are harvested, the accumulated metal compounds can be processed to extract the metals. This method is advantageous because it is more environmentally friendly than traditional mining operations, as it reduces soil erosion and minimizes habitat destruction.

The other choices do not accurately describe what plants absorb in this context. While plants do absorb water and nutrients, this option does not capture the specific focus of phytomining on metal compounds. Pure metals cannot be directly absorbed by plants, as they need to be in a soluble compound form. Similarly, oxidized minerals refer to a specific type of mineral state that does not represent the typical compounds absorbed during phytomining.