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Potato cyst nematodes are a pest of potato crops. The nematodes can li

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Joined: 21 Oct 2015
Posts: 5
Re: Potato cyst nematodes are a pest of potato crops. The nematodes can li  [#permalink]

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New post 17 Aug 2017, 22:06
arkle wrote:
I chose B when I attempted this question but now I realized that B is actually out of scope.

A company that has identified the relevant chemicals is planning to market them to potato farmers to spread on their fields when no potatoes are planted; any nematodes that emerge will soon starve to death.

(B) The only part of a potato plant that a nematode eats is the roots. --

I was thinking that No potatoes/potato roots will be present for nematodes to eat,so they will die.No.

The argument is to make them emerge from their protective cyst(not to kill them,we dont care whether they die or not),which only happens when potato roots emit certain chemicals.If making them emerge from their cyst is considered WIN and there will be no potato roots present,then definitely it is the magic of new chemical,which is exactly what company is trying to test.


I address this question in the same way. I still think that B is attempting and that B could be correct.
The win here IMO could only be achieved only if nematodes "starve to death" after emerging from the protective capsules.
I considered both B and D but eventually went with B.
D IMO is not convincing.
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Re: Potato cyst nematodes are a pest of potato crops. The nematodes can li  [#permalink]

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New post 04 Jul 2018, 10:18
Premise1: Potato cyst nematodes are a pest of potato crops.
Premise2: The nematodes can lie dormant for several years in their cysts, which are protective capsules, and
Premise3: The Nematodes do not emerge except in the presence of chemicals emitted by potato roots.
Premise4: A company that has identified the relevant chemicals in planning to market them to potato farmers to spread on their fields when
no potatoes are planted;
Conclusion: any nematodes that emerge will soon starve to death.

According to Premise4, Company's Plan: To eliminate the pests before potatoes are planted, i.e, apply the relevant chemicals to bring the pests out of their protective capsules without the potato crops.

To Strengthen the argument, we need to show that the Company's plan will be successful/near to successful.

(A) Nematodes that have emerged from their cysts can be killed by ordinary pesticides.
This is irrelevant to the plan. As the plan is talking about the use of the chemical emitted by potato roots. Ordinary Pesticides are not in picture anywhere.

(B) The only part of a potato plant that a nematode eats is the roots.
This statement has nothing to do with the plan.
The company's plan is to eliminate the pests
before plantation of potatoes.
Whatever part of the potato plant the nematode eats does not support the company's plan of marketing chemical to the farmers.

(C) Some bacteria commonly present in the roots of potatoes digest the chemicals that cause the nematodes to emerge from their cysts.
[Bacteria not discussed – eliminate it]

(D) Trials have shown that spreading even minute quantities of the chemicals on potato fields caused nine-tenths of the nematodes present to emerge from their cysts.
As per this finding majority of nematodes will be starving to death.

(E) the chemicals that cause the nematodes to emerge from their cysts are not emitted all the time the potato plant is growing.
This statement may be true about the release of chemicals during potatoes growth lifecycle, but we are concerned with the chemicals explicitly spread by the farmers before the potatoes are planted

Thus, only option D remains and is the final answer.
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Re: Potato cyst nematodes are a pest of potato crops. The nematodes can li &nbs [#permalink] 04 Jul 2018, 10:18

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