facultative

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"Fascinatingly, we found that the obligately agamospermous Balanophora species were all island species -- and we speculate that more Balanophora species may be facultative, or even obligate, agamosperms."

From Science Daily • Dec. 20, 2025

However, there remain many unknowns about parthenogenesis, particularly the form known as facultative parthenogenesis, which is quite rare and only happens in animals that sexually reproduce.

From Salon • Jul. 28, 2023

Some species, termed facultative parthenogens, alternate between sexual and asexual reproduction.

From Scientific American • Jun. 9, 2023

Animals that exhibit facultative migration can choose to migrate or not.

From Textbooks • Jun. 9, 2022

The greater number of the organisms are facultative anærobes and oxygen is not necessary. 32Again, koumiss put up in bottles on the first day is regularly shaken although air is excluded.

From The Bacillus of Long Life a manual of the preparation and souring of milk for dietary purposes, together with and historical account of the use of fermente by Douglas, Loudon