The most likely consequence of a herbicide that selectively inhibits the development of antheridia would be the reproduction of female plants only.
The antheridia are haploid reproductive structures that produce male gametes in some types of plants.
The antheridia can generate a special type of biflagellate sperm (male gametes) required during se_xual reproduction.
Conversely, archegonia is a structure that produces a single egg, i.e., the ovum or female gamete.
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