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A recent study has provided clues to predator-prey dynamics in the lat

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New post 13 Feb 2017, 07:40
10 min
All correct ..i think i took 1.5 min extra :(
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New post 13 Feb 2017, 07:42
1
er.arun88 wrote:
Hi,
can someone please help me in the "Primary Purpose" Question

1. The primary purpose of the passage is to
A. present several explanations for a well-known fact
B. suggest alternative methods for resolving a debate
C. argue in favor of a controversial theory
D. question the methodology used in a study
E. discuss the implications of a research finding

Why Option A is rejected.


No where in the passage , it is mentioned that the passage is presenting explanation of a "well known fact"..
E is more elegant.
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New post 29 Apr 2017, 20:43
Approx 5-6 mins on this passage. All correct. A simple passage on the whole. And yes, this is a GMATPrep Question. Cheers.
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New post 14 Aug 2017, 06:13
I feel there is serious flaw in the question 5 itself

5. According to the passage, if the researchers had NOT found that two extinct carnivore species were free of tooth breakage, the researchers would have concluded that

A. the difference in breakage frequencies could have been the result of damage to the fossil remains in the La Brea pits

passage part concerning to above question

They rejected preservational bias because a total absence of breakage in two extinct species demonstrated that the fractures were not the result of abrasion within the pits.

This additional word "tooth" in the question is enough to confuse completely while understanding question itself.
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New post 16 Jan 2018, 20:28
I got confused between D and E in Q3. Both the statements are mentioned in the paragraph.
Also, in Q4, I didn't understand why we chose D as an answer. Please explain the meaning of the statement.
Thanks in advance.
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New post Updated on: 22 Jan 2018, 16:21
Hi Shivikaa,

Shivikaa wrote:
I got confused between D and E in Q3. Both the statements are mentioned in the paragraph.
Also, in Q4, I didn't understand why we chose D as an answer. Please explain the meaning of the statement.
Thanks in advance.


For Q3) This whole passage is talking about tree rings and how climatic variations affect those rings.
so 1)dendrochronologists' failure to consider the prevalence of erratic weather patterns-- we are not discussing about any prevalence of erratic weather conditions here.(Wrong)
2)inconsistencies introduced because of changes in methodology--We never discussed any particular methodology here(wrong)
3)some tree species' tendency to deviate from the norm.(Wrong)
4)the lack of detectable variation in trees with complacent rings--This is mentioned in the paragraph, but uncertainties here referring more with climatic conditions and variation in rings, this statement just tells about the variation in rings due to water supply .
5)the lack of perfect correlation between the number of a tree's rings and its age---due to climatic conditions.so this is correct.
see in the last line of the paragraph where author mentioned "when growth halts temporarily and then starts again." when this happens we cant really say what is tree's age.its not consistent.

Hope this is clear.

Thanks

Originally posted by skhyadi on 21 Jan 2018, 02:25.
Last edited by GMATNinjaTwo on 22 Jan 2018, 16:21, edited 1 time in total.
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New post 24 Jan 2018, 20:18
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Shivikaa wrote:
I got confused between D and E in Q3. Both the statements are mentioned in the paragraph.
Also, in Q4, I didn't understand why we chose D as an answer. Please explain the meaning of the statement.
Thanks in advance.

Quote:
3. According to the passage, the researchers believe that the high frequency of tooth breakage in carnivores found at La Brea was caused primarily by

A. the aging process in individual carnivores
B. contact between the fossils in the pits
C. poor preservation of the fossils after they were removed from the pits
D. the impact of carnivores’ teeth against the bones of their prey
E. the impact of carnivores’ teeth against the bones of other carnivores during fights over kills

Refer to this portion: "The explanation they consider most plausible is behavioral differences between extinct and present-day carnivores—in particular, more contact between the teeth of predators and the bones of prey due to more thorough consumption of carcasses by the extinct species." The passage specifically talks about contact between teeth of predators and the bones OF PREY, not between teeth of predators and the bones OF OTHER CARNIVORES during fights over kills. Thus, (E) should be eliminated, and (D) is the best choice.

As for question 4, refer to this portion: "the researchers dismissed demographic bias because older individuals were not over represented in the fossil samples." We can infer that demographic bias has to do with age differences. More specifically, if all of the fossils were from OLDER individuals, then the high proportion of tooth fractures might simply be a result of the aging process . In other words, in order to accurately compare the fossil teeth to the teeth of present-day predators, we need samples representing all ages in both groups.

With that in mind, let's consider the choices:

Quote:
4. The researchers’ conclusion concerning the absence of demographic bias would be most seriously undermined if it were found that

A. the older an individual carnivore is, the more likely it is to have a large number of tooth fractures - This explains why we could have demographic bias if older individuals WERE over represented in the fossil samples. However, we are told that older individuals were NOT over represented, so (A) can be eliminated.

B. the average age at death of a present-day carnivore is greater than was the average age at death of a Pleistocene carnivore - If the OPPOSITE were true, that might hurt the author's argument by suggesting that the higher frequency of fractures among Pleistocene carnivores is a result of their longer life spans. As written, choice (B) gives us more reason to suspect that the fractures are not related to age (since the group that lived longer had fewer fractures). Regardless, the author is simply asserting that older individuals were not over represented in the fossils. Choice (B) does not affect this claim and can be eliminated.

C. in Pleistocene carnivore species, older individuals consumed carcasses as thoroughly as did younger individuals - If this were not true, it might explain why one age group would show more fractures. But choice (C) says that the two groups consumed carcasses equally thoroughly, so we don't have to worry about this possible age-related variable. Regardless, this doesn't have anything to do with the demographic bias referred to by the author. This bias only occurs if the fossils over represent certain age groups (i.e. older individuals). (C) can be eliminated.

D. the methods used to determine animals’ ages in fossil samples tend to misidentify many older individuals as younger individuals - The author claims that the fossils do not over represent older individuals. But what if the ages of the fossilized animals were not accurate? Choice (D) suggests that many of the "younger" fossilized animals may have actually been "older" individuals. In that case, the fossils WOULD over represent older individuals, and we'd have a demographic bias. Thus, choice (D) would undermine the researchers’ conclusion concerning the absence of demographic bias.

E. data concerning the ages of fossil samples cannot provide reliable information about behavioral differences between extinct carnivores and present-day carnivores - The author does not talk about using age data to determine behavioral differences. The author simply claims that the fossils do not over represent older individuals. Choice (E) is irrelevant.

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New post 03 Feb 2018, 05:14
manishkhare wrote:
1E 2A(Incorrect) 3D 4D 5A 6A


Total time =3 minutes 21 seconds



3mins 21 secs for 6 ques + reading passage => I am feeling jealous by your reading speed -> indeed i have seen your posts in other RC with fastest time -> generally 3m21s we take for only solving :shocked

I am just imagining your speed of going thru RC passage and then questions -> snapshot memory :thumbup:
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New post 03 Feb 2018, 05:16
10 mins total
4 mins to read and 6 mins for questions
1 incorrect .
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New post 05 Mar 2018, 14:19
8 minutes - 2 Incorrect
sayantanc2k abhimahna - Could you please explain the 4th question?
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Re: A recent study has provided clues to predator-prey dynamics in the lat  [#permalink]

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New post 21 Mar 2018, 10:10
What should the optimum time that this question should take ?
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Re: A recent study has provided clues to predator-prey dynamics in the lat &nbs [#permalink] 21 Mar 2018, 10:10

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