Biology Forums - Study Force

After reading the paragraph below, answer the questions that follow.

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 B indicates that

▸ atrazine-treated males were more successful in copulation with females than nontreated males.

▸ there were fewer atrazine-treated males than nontreated males.

▸ atrazine-treated males are unable to mate.

▸ nontreated males were more successful in copulation with females than atrazine-treated males.

nontreated males were more successful in copulation with females than atrazine-treated males.

After reading the paragraph below, answer the questions that follow.

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

▸ determine number of matings per frog.

▸ act as controls.

▸ show that not all matings are successful.

▸ increase the sample size.

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After reading the paragraph below, answer the questions that follow.

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

▸ greater body weight is associated with high testosterone levels.

▸ frogs gain more weight in summer than winter.

▸ body weight does not correlate to a higher number of successful matings.

▸ frogs gain weight over time.

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After reading the paragraph below, answer the questions that follow.

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.




When considered together, Parts A and C demonstrate

▸ that testosterone levels are lower in nontreated frogs.

▸ that all frogs in the experiments were male.

▸ a possible explanation for the effect of atrazine.

▸ a lack of relationship between successful mating and testosterone levels.

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After reading the paragraph below, answer the questions that follow.

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.




Supposed additional tests conducted on these two groups of frogs indicated that atrazine-treated frogs have lower fertility rates than nontreated frogs, even though both groups have adequate sperm content. What might be concluded about long term-effects of atrazine?

▸ Testosterone levels of atrazine-exposed males directly impact female frogs' copulation behaviors.

▸ Non-atrazine-treated frogs are more likely to show an increase in body weight and testosterone levels in the presence of sexually mature female frogs.

▸ Small body weight and decline in fertility in atrazine-exposed males will have a direct negative impact on populations of African clawed frogs.

▸ The inability to compete for females and the decline in fertility in atrazine-exposed males will have a direct negative impact on populations of African clawed frogs.

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TY

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