Which characteristic describes glyphosate's movement in plants?

Glyphosate is a systemic herbicide, meaning that it is absorbed by the plant and then translocated throughout its system, including to the roots. This characteristic is crucial for its effectiveness, particularly against perennial weeds that rely on root systems for survival. When glyphosate is applied, it moves from the point of absorption—typically the leaves—to other parts of the plant, allowing it to reach areas like the roots where it can disrupt critical physiological processes. This systemic action aids in the eventual death of the entire plant, rather than just impacting the foliage.

In contrast, the other options describe characteristics that do not apply to glyphosate. For instance, the assertion that it stays localized at the point of contact would limit its efficacy, particularly for deeper-rooted weeds. Saying it prevents nutrient absorption or targets only the leaves and stems overlooks the herbicide's ability to travel throughout the plant, which is key to its function as a broad-spectrum herbicide.