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In the 14th century, a landmass separated from the Californian coast,

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In the 14th century, a landmass separated from the Californian coast,  [#permalink]

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New post 25 Apr 2018, 01:43
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B
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Question Stats:

45% (02:10) correct 55% (02:06) wrong based on 239 sessions

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In the 14th century, a landmass separated from the Californian coast, isolating a species called the Boojum tree on the newly formed island, which is known today as Baja Island. The island trees that descended from this group produce creamy yellow flowers, whereas Boojum trees on the mainland produce pale pink flowers. Baja Island has year-round temperatures higher than that of the mainland. Therefore, the color of the Boojum flowers of Baja Island is influenced, at least to some extent, by the temperature changes that the island underwent. Which of the following is an assumption on which the argument depends?

A The number of Boojum trees on Baja Island has not significantly increased since the 14th century
B Since the 14th century, the mainland’s temperature has not changed in ways that have influenced the color of the Boojum flowers that bloom on the mainland
C None of the Boojum trees on Baja Island are known to be adversely affected by higher temperatures
D The soil on Baja island contains the same minerals, which influence the color of the Boojum flowers, as that on the mainland does
E The Boojum trees on Baja Island and those on the mainland are identical in all respects except for the color of their flowers

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In the 14th century, a landmass separated from the Californian coast,  [#permalink]

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New post 26 Apr 2018, 19:58
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Nice Question,

objection to argument? what if, yellow is normal color, and rather than temperature changes in Baja Island, temperature changes in mainland changed the normal color from yellow to pale pink.

Choice B eliminates this possibility
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Re: In the 14th century, a landmass separated from the Californian coast,  [#permalink]

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New post 26 Apr 2018, 21:15
I think the answer is D.
The soil on Baja island contains the same minerals, which influence the color of the Boojum flowers, as that on the mainland does.
Negate:
The soil on Baja island DOES NOT contain the same minerals, which influence the color of Boojum flowers as that on the mainland does
Weaken the conclusion by introducing an alternate explanation for the color of flowers

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Re: In the 14th century, a landmass separated from the Californian coast,  [#permalink]

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New post 26 Apr 2018, 22:06
A The number of Boojum trees on Baja Island has not significantly increased since the 14th century
- irrelevant

B Since the 14th century, the mainland’s temperature has not changed in ways that have influenced the color of the Boojum flowers that bloom on the mainland
- it says why colour of the boojum flowers are pink. Hold

C None of the Boojum trees on Baja Island are known to be adversely affected by higher temperatures
- does not talk about colour. Irrelevant

D The soil on Baja island contains the same minerals, which influence the color of the Boojum flowers, as that on the mainland does
- very indirect. Cannot be an assumption.

E The Boojum trees on Baja Island and those on the mainland are identical in all respects except for the color of their flowers
- irrelevant

IMO B.

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Re: In the 14th century, a landmass separated from the Californian coast,  [#permalink]

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New post 13 May 2018, 04:05
D is trap here

Negating D gives us soil does not have same minerals which influence color on island

But here we don't know how much soil actually influence color
Suppose if it influence only 10percent then no major difference
But if it influence more than 80 percent then it is considerable

B on other side
Says make sure temperature on mainland does not result in change of color from yellow to pink

So B is better choice here

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Re: In the 14th century, a landmass separated from the Californian coast,  [#permalink]

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New post 13 May 2018, 04:31
Can we get a proper explanation to why D is incorrect?

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Re: In the 14th century, a landmass separated from the Californian coast,  [#permalink]

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New post 27 Jan 2019, 23:03
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@SajittaKundu D is incorrect because the conclusion states that "the color of the Boojum flowers of Baja Island is influenced, at least to some extent, by the temperature changes that the island underwent", thereby already acknowledging that other factors bringing the change in colour might be present. The argument therefore only hinges on the temperature aspect which is well accounted for in B.
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Re: In the 14th century, a landmass separated from the Californian coast,   [#permalink] 27 Jan 2019, 23:03
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In the 14th century, a landmass separated from the Californian coast,

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