What is the primary mechanism of action for Garlon and Tordon?

The primary mechanism of action for Garlon and Tordon is that they control actively growing weeds and brush. These herbicides are classified as systemic, which means they are absorbed by the plant and move throughout its system to disrupt growth processes. Garlon is effective against woody plants and certain broadleaf weeds, while Tordon is particularly efficient against perennial weeds and certain brush species. By targeting actively growing tissues, these herbicides inhibit vital plant functions such as photosynthesis and cell division, leading to the eventual death of the targeted weeds and brush.

The incorrect options focus on processes that do not align with the chemical properties of Garlon and Tordon. For example, promoting flowering or enhancing rooting would suggest a supportive action on plant growth, which does not describe their function as herbicides. Similarly, while preventing seed germination is a significant mechanism for some types of herbicides, Garlon and Tordon are more effective against existing plant growth rather than just targeting seeds.