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Senior Manager
Joined: 27 Mar 2016
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01 Aug 2016, 09:16
1
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HerrGrau wrote:
Yep it does. I can see why that's confusing. But it doesn't have to be compared to the other plot (the non-mixed one). Adding more pollen increases seed production. That's it. No comparison to anything else except the previous state of having less pollen. Why does it have to be that adding more pollen in the mixed plot is different than in the non-mixed plot?

A.

Aw man. So I guess I did interpret "augment" incorrectly. I bet the increase in this case is over the situation where there are no pollinators. If this is true, I can finally sleep on this question.

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02 Aug 2016, 05:12
1
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This is a causal argument. The presence of dandelions causes larspur to give more seeds.
A basic assumption is that the 2 sets of plots here are comparable. Choice E essentially says that the 2 are not comparable.

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11 Aug 2016, 08:42
I agree with the E choice explanation. But still I have the same question as HiLine.
The correct answer E uses "can", which simply disturbs/challenges my CR skills and rules.If the option was like this : Soil disturbances results in fewer blooms, and hence lower seed production.. It is a spot on. Yeah, now we know the correct answer we can build on..and on...

Most of the time I eliminate if the answer choices has can/will.
Experts can you touch on situations for weaken type CR where can/will be an exceptional correct choice.

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Intern
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20 Sep 2016, 12:28
dharan wrote:
I agree with the E choice explanation. But still I have the same question as HiLine.
The correct answer E uses "can", which simply disturbs/challenges my CR skills and rules.If the option was like this : Soil disturbances results in fewer blooms, and hence lower seed production.. It is a spot on. Yeah, now we know the correct answer we can build on..and on...

Most of the time I eliminate if the answer choices has can/will.
Experts can you touch on situations for weaken type CR where can/will be an exceptional correct choice.

That's a very valid question. How I see it is, Strengthen/Weaken are all possibilities that Support/Undermine the answer. So we speculate if "X can support Y' (a possibility) then answer is S/W.

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21 Sep 2016, 05:18
Crucial wording for non-native.
I had to spend around 3 mins considering a dictionary to solve.

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Manager
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23 Oct 2016, 01:45
WillGetIt wrote:
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 ﬁom 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.

"Please hit +kudos if you like this post"

Basically you can deduce 2 general things here when dealing with an experiment that checks experiment group vs a control group:

[Group A: Lark],[Group B: DL/Lark]

To strengthen: DL->Success in group B (the control group)
To weaken: Z (some disturbance)->Lack of success in group A
and so, its not that DL->success, it's that something else cause the experiment to fail.

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CEO
Joined: 17 Jul 2014
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24 Oct 2016, 07:13
amatya wrote:
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.

Press Kudos if you like the post

without doubt E is the best answer.
E gives a valid reason to consider other factors that were not taken into consideration during the testing.

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12 Apr 2017, 23:40
amatya wrote:
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.

GMATNinja (E) Soil disturbances can result in fewer blooms, and hence LOWER seed production.

Implication:
The lower seed yield in the 8 plots was due NOT to the absence of dandelions but to the SOIL DISTURBANCE that occurred when the dandelions were removed, WEAKENING the conclusion that the presence of dandelions facilitates pollination.

Total = 16 plots
8 plots = WITHOUT dandelions
8 plots (control plots) = with dandelions

Conclusion : with dandelions, seed production, more pollinators to the mixed plots

How could we link soil disturbance to attack the conclusion? The answer choice (E) seems like attack 8 plots WITHOUT dandelions.
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Director
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16 Jul 2017, 22:19
mikemcgarry wrote:
Dear HiLine,
I'm happy to respond. As a huge Beethoven fan, I very much enjoy the icon you have chosen for your representation.

Here's the text of (B). Here's the text of (B).
(B) In mixed plots, pollinators can transfer pollen from one species to another to augment seed production.
This choice is not suggesting a mechanism for pollen transfer different from the pollinators. The pollinators are still involved. If pollinators are attracted to the mixed plot, as the prompt suggests, then choice clarifies that the pollinators, who have already been attracted, can cross-fertilize the two plants. It is 100% consistent with the original argument and hence strengthens it.

Does this make sense?
Mike

hi Mike, after checking all options, I know E is gonna be the correct answer. Nevertheless, I still have no idea of what the passage discusses about. Can you help me with this?

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VP
Status: Learning
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16 Jul 2017, 23:53
amatya wrote:
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.

Press Kudos if you like the post

A actually strengthen the argument as pollinators prefer dandelions over larkspurs and if the plot is mixed then there will be more pollination.
B also strengthen the argument this also increase pollination.
C No effect of the argument .
D Out of scope
E bingo this our answer .If the soil is disturbed then that is going to affect seed production in an adverse way .

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Joined: 28 Dec 2011
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17 Jul 2017, 16:46
chesstitans wrote:
hi Mike, after checking all options, I know E is gonna be the correct answer. Nevertheless, I still have no idea of what the passage discusses about. Can you help me with this?

Dear chesstitans,

I'm happy to respond.

My friend, I am going to challenge you. What you have asked is not an excellent question. A question that basically says, "I'm helpless. Make me understand." is not an excellent question. An excellent question presupposes a high degree of self-responsibility: toward that end, it makes explicitly clear what you understand and what's unclear.

Have you looked up the definitions of all the unfamiliar individual words in the passage? Part of being ambitious as a student is making a point to learn any word you encounter that you don't already know. Do you understand the basic science of pollination? I am talking about not the very technical knowledge (e.g. the molar biology of pollination), but simply what folks learn in grade school about pollination.

Go through the passage finding the definition of every single word you don't know. Remind yourself of the basic science here. Then, tell me exactly what do you understand about the passage and exactly what still confuses you.

You see, when you ask an excellent question such as this, you are forcing yourself to wrestle with the material at a much deeper level. You see, it's relatively easy simply to throw up your hands and say, "I don't understand." It's much hard to engage deeply with material that doesn't come easily to you: even though you don't get answers through that process, your understanding is deepened, and your mind is primed to receive any answer you get at a much deeper level.

Asking excellent questions is one of the habits of excellence. Many students say they want an excellent score (e.g. 700+), but few have the patience & determination & dedication to exercise all the habits of excellent diligently.

Does all this make sense?
Mike
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02 Aug 2017, 06:18
in strengthening/weakening question,an option that is inconsistent with the premise or support a premise can be a possible answer?

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BSchool Forum Moderator
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02 Aug 2017, 06:26
1
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BOOKMARKED
JAIN09 wrote:
in strengthening/weakening question,an option that is inconsistent with the premise or support a premise can be a possible answer?

Hi JAIN09 ,

No, that is not correct.

If you are asked to weaken a conclusion, your answer should not be something that is breaking the premise.

Premises are the source of truth and cannot be broken.

The answer should have some relation with the conclusion or the assumption made to draw that conclusion from the given premise.

For this question specifically, conclusion is saying X led to Y.

Assumption was there is not alternate cause. By stating E, we are saying there is something else that led to the conclusion and it was not the given premise.

Hence, E is correct.

Does that make sense?
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Senior Manager
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02 Aug 2017, 09:02
1
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BOOKMARKED
Quote:
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 rom 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.

This is a fantastic Official Question.
Here's the crux of the argument -> Dandelions are non-native and larkspur are native flowers. Bees interact with both of them.
16 Plots divided into 2 Groups
Group 1 - 8 Plots where all Dandelions are removed.
Group 2 (Control Group) - 8 Plots remain as is.
Research Result -> Group 2 has more larkspur seeds than Group 1 => researchers think presence of dandelion helps facilitate pollination.

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

Quote:
(A) Bumblebees preferentially visit dandelions over larkspurs in mixed plots.

This is a strange one. This would explain why bumblebees interact with Group 2 more than they do with Group 1, but then why would we have larkspur seeds? OUT!

Quote:
(B) In mixed plots, pollinators can transfer pollen from one species to another to augment seed production.

This seems to strengthen the researcher's conclusion that the presence of dandelion helps with increased pollination of larkspur seeds. This is an opposite of what we are looking for. OUT!

Quote:
(C) If left unchecked, nonnative species like dandelions quickly crowd out native species.

Really GMAT? Then why do we have more larkspur seeds? OUT!

Quote:
(D) Seed germination is a more reliable measure of a species’ ﬁtness than seed production.

We're only talking about seed production so this is completely irrelevant.

Quote:
(E) Soil disturbances can result in fewer blooms, and hence lower seed production.

Here we go. An alternative explanation of what can cause the lower seed production in Group 1, and this does weaken the researcher's conclusion. Their conclusion was based on the primary assumption that both the groups had the same conditions for pollination barring the dandelion flowers in Group 2.

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