Certain plant species are able to absorb poisonous heavy metal ions that are dissolved in water within the soil. These ions build up in the aerial regions of the plant, which can then be harvested and disposed of safely. An investigation was done into the capacity of a plant species to remove a heavy metal ion from soil. The following observations were obtained: some heavy metal ions had accumulated in the cells of the root cortex; inside these cells, most of the ions were located in the vacuole; in both the roots and the leaves, the ions were moved while dissolved in water. Which statements about the movement and build-up of heavy metals are correct?
- A1 and 2
- B2 and 3
- C1 only
- D3 only