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More selective than most chemical pesticides in that they ordinarily d

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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 22 Mar 2019, 08:26
Why q6 Option B is wrong. "the extinction of a blue butterfly that had depended on the nests to shelter its offspring. " I didn't understand nests of what??
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 09 Apr 2019, 09:24
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mallya12 wrote:
Why q6 Option B is wrong. "the extinction of a blue butterfly that had depended on the nests to shelter its offspring. " I didn't understand nests of what??

The chain of events is a bit confusing on this one! Let's organize the information from the passage:

  • A virus was introduced to control the rabbit population
  • Large rabbit populations REDUCE ground cover (and "vegetation" is another word for "ground cover"). So, controlling the rabbit population INCREASED vegetation
  • Increasing vegetation REDUCED underground ant nests
  • The blue butterflies depended on underground ant nests to shelter their offspring. So, reducing the underground ant nests led to the extinction of the butterflies

Question #6 asks us what the passage suggests above the blue butterflies.

Here is answer choice (B):
Quote:
(B) The blue butterfly's survival was indirectly dependent on sustaining large amounts of vegetation in its habitat.

From the information above, we know that the exact opposite of answer choice (B) is true. The blue butterflies depended on underground ants nests, which depended on reduced vegetation. For this reason, answer choice (B) is out.

I hope that helps!
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 28 Sep 2019, 02:51
Hello,
For Qs 3 i got confused between B and D since they've clearly stated an example of the butterfly and its extinction for B. Hence i chose B. Can someone kindly clear my doubt?

Posted from my mobile device
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 29 Sep 2019, 02:24
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the passage is easy to read and understand. but to answer questions requires you to find out the place in the passage, which yield the information in the correct answer. positioning the place is time consuming and require patience. if you are hurried, you die. once you find the place, you can be confident with your choice.

the challenging is the fine the place in the passage dense with details and information.
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 30 Sep 2019, 15:28
SajjadAhmad

Hi mate, there are multiple typos in the OP

Q3 E should be "with a larger species"

Q4 E should be "occur"
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 29 Oct 2019, 08:48
Chinmay1998 wrote:
Hello,
For Qs 3 i got confused between B and D since they've clearly stated an example of the butterfly and its extinction for B. Hence i chose B. Can someone kindly clear my doubt?

Posted from my mobile device

Question 3 asks us to identify which choice is mentioned in the passage as an indirect effect of using a biocontrol agent.

Here's choice (B):

Quote:
(B) An unintended proliferation of a nontarget animal species

This choice does not state any example outright, so we shouldn't fill in that information as a reason for keeping the choice around.

Instead, (B) tells us that the unintended proliferation of a nontarget animal species is an indirect effect of using a biocontrol agent. Proliferation means rapid increase, and there's no evidence for that taking place in the passage:

  • The highlighted example describes what happened when rabbits were targeted by a biocontrol agent.
  • After the biocontrol agent (a virus) was introduced, two nontarget animal species were affected: ants and blue butterflies.
  • The indirect effect on ants was that underground ant nests were reduced.
  • The indirect effect on the blue butterfly was extinction.

Reduction goes in the opposite direction of proliferation, and extinction is basically as far as you can get from proliferation. This is why (B) must be eliminated.

Here's choice (D):

Quote:
(D) Diminution of the positive effects conferred by a nontarget animal species

Again, this choice does not state any example outright, and never mentions the butterfly. We need to be precise when confirming whether this matches the passage.

Fortunately, when we check the passage, choice (D) is a spot-on match for what the author has written:

Quote:
However, biocontrol agents can negatively affect nontarget species by, for example, competing with them for resources: a biocontrol agent might reduce the benefits conferred by a desirable animal species by consuming a plant on which the animal prefers to lay its eggs.

This is why we keep (D) as the correct choice.

I hope this helps!
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 03 Dec 2019, 00:33
WHY in Q-6 answer cant be B?
Kindly clarify?
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 04 Jan 2020, 09:09
PreiteeRanjan wrote:
WHY in Q-6 answer cant be B?
Kindly clarify?

Please check out this post and let us know if you have further questions.

I hope that helps!
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 06 Jan 2020, 21:07
this scenario is called "easy passage, close answers".
in this situation, we well meet an easy passage , which we can understand it with easy. but the questions are hard, specifically, the questions 2,3 and 4, contain 2 answer choices which are close. both these choices look correct but one of them contain ONE wrong word. realizing to find ONE WRONG WORD is key
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 07 Jan 2020, 04:49
Question 3, why can't it be option E?
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 19 Jan 2020, 07:38
Can someone explain why Q3 option E is incorrect? is it because the passage only says that bio-control agents compete with non-target species for resources and not "larger species" per se?

Q4. Why is option E wrong?

Q5. Is option B wrong because the passage does not mention anything about bio-control agents having "direct adverse effects"?
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Re: More selective than most chemical pesticides in that they ordinarily d  [#permalink]

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New post 27 Jan 2020, 15:26
DiyaDutta wrote:
Can someone explain why Q3 option E is incorrect? is it because the passage only says that bio-control agents compete with non-target species for resources and not "larger species" per se?

That's right! The author tells us that biocontrol agents can negatively affect nontarget species by competing with them for resources. However, the author NEVER mentions larger species. That's why we eliminate (E).

Question 4


Quote:
Q4. Why is option E wrong?

Here's the highlighted text that Q4 asks us to analyze:

    Another example of indirect negative consequences occurred in England when a virus introduced to control rabbits reduced the amount of open ground (because large rabbit populations reduce the ground cover), in turn reducing underground ant nests and triggering the extinction of a blue butterfly that had depended on the nests to shelter its offspring.

In this scenario, the introduction of a biocontrol agent (a virus to control rabbits) led to a change in habitat (less ground cover), which in turn suppressed an unrelated structure in that habitat (underground ant nests), which in turn led to the extinction of a nontarget species (blue butterfly) that depended on the structure to survive (using the ant nests to shelter butterfly offspring).

Choice (E) states that this example most clearly serves to illustrate "the way in which indirect consequences from the use of biocontrol agents are most likely to occur."

But is the author trying to show us that indirect consequences of biocontrol agents most likely happen in this way?

  • Biocontrol agent for species A changes habitat
  • Change in habitat suppresses an unrelated structure built by species B
  • Suppression of unrelated structure leads to extinction of species C

Nope! This is simply one of many ways that indirect consequences can occur. The highlighted example is preceded by a description of a different scenario and followed by an admission that we lack information about extinctions and disruptions resulting from indirect interactions.

That's why we eliminate (E). Choice (B) remains the most accurate description of why the author brings up this highlighted example.

Question 5


Quote:
Q5. Is option B wrong because the passage does not mention anything about bio-control agents having "direct adverse effects"?

Let's make sure we're 100% clear on what the question is asking:

    5. According to the passage, which of the following is a concern that arises with biocontrol agents but not with chemical pesticides?

The correct answer choice will reflect what the author tells us is a concern that DOES arise with biocontrol agents but DOES NOT arise with chemical pesticides. And the passage gives us our answer pretty explicitly:

    ...unlike a chemical pesticide, a biocontrol agent may adapt in unpredictable ways so that it can feed on or otherwise harm new hosts.

The correct answer choice should also identify this specific difference: Biocontrol agents can adapt in unpredictable ways, while chemical pesticides cannot adapt. Choice (C) is the only choice that matches up, which is why we keep it.

Now, here's choice (B) again:

    (B) Biocontrol agents are likely to have indirect as well as direct adverse effects on nontarget species.

You're right to point out that the author never mentions whether biocontrol agents have direct adverse effects on nontarget species. However, we can also eliminate (B) based on the fact that this choice does NOT identify what the author plainly tells us is a key difference between biocontrol agents and chemical pesticides.

I hope this helps!
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Re: More selective than most chemical pesticides in that they ordinarily d   [#permalink] 27 Jan 2020, 15:26

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