The Herbicide Atrazine Is a Known Endocrine Disruptor to the Development

question 25

Multiple Choice

The herbicide atrazine is a known endocrine disruptor to the development stages of several animal species, including fish, reptiles, and amphibians. Scientists interested in studying long-term effects of exposure to atrazine on mating behaviors compared an all-male population of sexually mature African clawed frogs (Xenopus laevis) exposed to atrazine (Atz) to a sexually mature population of African clawed frogs not exposed to atrazine (Con) . Amplexus is defined as the mating position of frogs.

-The role of the nontreated males in this experiment is to

• A) increase the sample size.
• B) act as controls.
• C) show that not all matings are successful.
• D) determine number of matings per frog.

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