The Herbicide Atrazine Is a Known Endocrine Disruptor to the Development

question 5

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.

-Part A demonstrated that

• A) greater body weight is associated with high testosterone levels.
• B) body weight does not correlate to a higher number of successful matings.
• C) frogs gain weight over time.
• D) frogs gain more weight in summer than winter.