Which of the following is a characteristic of translocated herbicides?

Translocated herbicides are designed to be absorbed by plant foliage and then move systemically through the plant’s vascular system. This means they can kill not only the areas they directly contact but also parts of the plant that are not in immediate contact with the herbicide. The correct answer highlights that translocated herbicides effectively kill plants by being transported from the leaves into the roots and other tissues, allowing for a more thorough and efficient eradication of the target plant.

The other options focus on characteristics that do not apply to translocated herbicides. For instance, the notion that these herbicides only kill at the point of contact refers to contact herbicides, which do not spread throughout the plant. Similarly, some herbicides may persist in soil, but translocated herbicides are characterized more by their systemic action rather than persistence. Lastly, while some herbicides may work by blocking photosynthesis, translocated herbicides can target various physiological processes instead of being limited to just one mechanism of action. This multifaceted approach is what makes the correct option a more complete reflection of translocated herbicides.