【OG24-791题】In Colorado subalpine meadows, nonnative dandelions co-occur with a native flower, the larkspur. Bumblebees visit both species, creating the potential for interactions between the two species with respect to pollination. In a recent study, researchers selected 16 plots containing both species; all dandelions were removed from eight plots; the remaining eight control plots were left undisturbed. The control plots yielded significantly more larkspur seeds than the dandelion-free plots, leading the researchers to conclude that the presence of dandelions facilitates pollination (and hence seed production) in the native species by attracting more pollinators to the mixed plots.Which of the following, if true, most seriously undermines the researchers’ reasoning?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

Help

右上角的时钟图标会对每道题和所有题计时
右上角的文件夹点击可以打开和关闭当前题号
点击右上角的星星图标，所有被收藏的题目均可在“我的”-“收藏”中找到
点击右下角 Next进入下一题。注意：如果你没有做当前题目，你将不可以进入下一题
点击左下角的 Quit或 End Exam 即可退出练习

End Section Review

yes

End Exam

yes

Answer Edit Confirmation

你想更改这个问题的答案吗?

Yes,换答案

No，保留原始答案并回到问题上

最新题目

题目内容

纠错

In Colorado subalpine meadows, nonnative dandelions co-occur with a native flower, the larkspur. Bumblebees visit both species, creating the potential for interactions between the two species with respect to pollination. In a recent study, researchers selected 16 plots containing both species; all dandelions were removed from eight plots; the remaining eight control plots were left undisturbed. The control plots yielded significantly more larkspur seeds than the dandelion-free plots, leading the researchers to conclude that the presence of dandelions facilitates pollination (and hence seed production) in the native species by attracting more pollinators to the mixed plots.

Which of the following, if true, most seriously undermines the researchers’ reasoning?

Bumblebees preferentially visit dandelions over larkspurs in mixed plots. In mixed plots, pollinators can transfer pollen from one species to another to augment seed production. If left unchecked, nonnative species like dandelions quickly crowd out native species. Seed germination is a more reliable measure of a species’ fitness than seed production. Soil disturbances can result in fewer blooms, and hence lower seed production.

正确答案： E

参考解析

提交我的解析

题干翻译
两种物种存在，产生了授粉方面相互作用的可能性。在最近研究中，研究者选了16块含两种物种的地块，8块地的蒲公英被移除，8块对照地块未动。对照地块飞燕草种子产量显著高于无蒲公英地块，研究者得出结论：蒲公英的存在通过吸引更多传粉者到混合地块，促进了本地物种的授粉（进而种子生产）。 逻辑链
Dandelions presence → More pollinators → Higher seed production 问题类型
削弱题 推理过程
研究者根据有蒲公英地块种子产量高，认为是蒲公英吸引传粉者促进授粉导致。要削弱，需找出其他可能导致种子产量差异的原因。 选项分析
A选项：大黄蜂在混合地块优先访问蒲公英。但没说这对飞燕草种子产量有何影响，无法削弱，排除。 B选项：在混合地块传粉者能在物种间转移花粉增加种子产量，是在加强蒲公英促进授粉的观点，排除。 C选项：蒲公英会排挤本地物种，与蒲公英是否促进授粉和种子生产无关，排除。 D选项：种子发芽比种子生产是更可靠的物种适应性衡量标准，话题与蒲公英是否促进种子生产无关，排除。 E选项：土壤扰动会导致花朵减少，进而种子产量降低。指出可能是移除蒲公英时对土壤的扰动造成无蒲公英地块种子产量低，而非蒲公英本身对授粉的促进作用，削弱了研究者的推理，当选。

题目讨论 (如果对题目有任何的疑惑，欢迎在这里提出来，大家会帮你解答的哦~)

还没有人评论,赶快抢个沙发~

做题笔记

参考解析

题目讨论 (如果对题目有任何的疑惑，欢迎在这里提出来，大家会帮你解答的哦~)

请选择错误类型：

请描述一下这个错误：