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In the last decade, the country of Alumba has undergone a massive cons

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In the last decade, the country of Alumba has undergone a massive cons [#permalink]

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New post 15 Jan 2018, 05:42
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In the last decade, the country of Alumba has undergone a massive construction boom. In one city, Semanta, hundreds of new buildings have been erected and, as a result, the ambient light at night has increased from 0.10 lux to 10 lux, causing migratory birds flying to alter their traditional path and fly into Semanta, where they often crash into buildings. The mayor believes that to ensure the birds keep to their traditional flight path while flying through Alumba, the city should turn off lights throughout the city at night during the bird’s migratory season, so that ambient light is around 0.10 lux.

Which of the following, is necessary, to evaluate the mayor’s proposal for limiting the amount of night light that Semanta emits?

A The amount of lux necessary to interfere with a bird’s navigational abilities.
B The percent of birds flying through Alumba that are drawn to Semanta’s night light.
C Whether the period in which birds migrate is consistent each year.
D Whether there are any other migratory birds flying through Alumba.
E Whether there are any other cities in Alumba that might also emit enough ambient light to confuse migrating birds.
[Reveal] Spoiler: OA
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Re: In the last decade, the country of Alumba has undergone a massive cons [#permalink]

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New post 15 Jan 2018, 06:01
In the last decade, the country of Alumba has undergone a massive construction boom. In one city, Semanta, hundreds of new buildings have been erected and, as a result, the ambient light at night has increased from 0.10 lux to 10 lux, causing migratory birds flying to alter their traditional path and fly into Semanta, where they often crash into buildings. The mayor believes that to ensure the birds keep to their traditional flight path while flying through Alumba, the city should turn off lights throughout the city at night during the bird’s migratory season, so that ambient light is around 0.10 lux.

Which of the following, is necessary, to evaluate the mayor’s proposal for limiting the amount of night light that Semanta emits?

A The amount of lux necessary to interfere with a bird’s navigational abilities.
It is already given that earlier emission of 0.10 was not a problem, so getting it back to 0.1 should not be an issue

B The percent of birds flying through Alumba that are drawn to Semanta’s night light.
The issue is of amount of lux and not the number of migratory birds.

C Whether the period in which birds migrate is consistent each year.
Same as B

D Whether there are any other migratory birds flying through Alumba.
This does not affect the migratory bird in question

E Whether there are any other cities in Alumba that might also emit enough ambient light to confuse migrating birds.
Correct.. The conclusion is of the migratory birds in the country of Alumba whereas the argument talks of only Semanta"s night light..
If there is a excess of the light in other areas, it will effect the migratory birds of Albuma


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Re: In the last decade, the country of Alumba has undergone a massive cons [#permalink]

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New post 15 Jan 2018, 09:20
NOT A.We are not bothered about the necessary lux for bird disturbance.The plan tells us that we are coming down to 0.1lux which dint create a problem before.Hence not this option.

E mentions the gap in the argument.
Re: In the last decade, the country of Alumba has undergone a massive cons   [#permalink] 15 Jan 2018, 09:20
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In the last decade, the country of Alumba has undergone a massive cons

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