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vishalwin
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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.
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.
