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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Given Kudos: 1055
GPA: 3.39
In Colorado subalpine meadows, nonnative dandelions co-occur with a na
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27 Mar 2022, 08:30
27 Mar 2022, 08:30
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Question 1
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17% (02:16) correct
83% (02:10) wrong based on 12 sessions
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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?
(A) Bumblebees preferentially visit dandelions over larkspurs in mixed plots.
(B) In mixed plots, pollinators can transfer pollen from one species to another to augment seed production.
(C) If left unchecked, nonnative species like dandelions quickly crowd out native species.
(D) Seed germination is a more reliable measure of a species’ fitness than seed production.
(E) Soil disturbances can result in fewer blooms, and hence lower seed production.
Target Test Prep Representative
Joined: 13 Jul 2021
Posts: 32
Given Kudos: 416
Re: In Colorado subalpine meadows, nonnative dandelions co-occur with a na
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27 Mar 2022, 10:42
27 Mar 2022, 10:42
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Expert Reply
In this question, notice that the conclusion of the argument, "the presence of dandelions facilitates pollination (and hence seed production) in the native species by attracting more pollinators to the mixed plots," is supported by the information that, 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, and the control plots yielded significantly more larkspur seeds than the dandelion-free plots.
The conclusion seem logical, but does it really follow from the evidence? What would cast doubt on the idea that the conclusion follows from the evidence?
The conclusion seem logical, but does it really follow from the evidence? What would cast doubt on the idea that the conclusion follows from the evidence?
gmatclubot
Re: In Colorado subalpine meadows, nonnative dandelions co-occur with a na [#permalink]
27 Mar 2022, 10:42
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