There are herbicides for weeds only and those for grass and weeds; how do the chemicals make a distinction between the two?

Question

There are herbicides for weeds only and those for grass and weeds; how do the chemicals make a distinction between the two?

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Answer 1

And sometimes it’s simpler: a weed may have more surface area to absorb the herbicide (broad leaf), whereas a blade of grass has less. In one case the dose is toxic and the other case not, or less so.