Find all School-related info fast with the new School-Specific MBA Forum

It is currently 22 Nov 2014, 06:19

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Scientists studying the physiology of dinosaurs have long

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
2 KUDOS received
Manager
Manager
avatar
Joined: 21 Aug 2012
Posts: 170
Followers: 0

Kudos [?]: 11 [2] , given: 7

Scientists studying the physiology of dinosaurs have long [#permalink] New post 30 Jan 2013, 22:38
2
This post received
KUDOS
1
This post was
BOOKMARKED
Scientists studying the physiology of dinosaurs have long debated whether dinosaurs were warm- or cold-blooded. Those who suspect they were warm-blooded point out that dinosaur bone is generally fibro-lamellar in nature; because fibro-lamellar bone is formed quickly, the bone fibrils, or filaments, are laid down haphazardly. Consistent with their rapid growth rate, warm-blooded animals, such as birds and mammals, tend to produce fibro-lamellar bone, whereas reptiles, which are slow-growing and cold-blooded, generally produce bone in which fibrils are laid down parallel to each other. Moreover, like the bone of birds and mammals, dinosaur bone tends to be highly vascularized, or filled with blood vessels. These characteristics, first recognized in the 1930’s, were documented in the 1960’s by de Ricqlès, who found highly vascularized, fibro-lamellar bone in several groups of dinosaurs. In the 1970’s, Bakker cited these characteristics as evidence for the warm-bloodedness of dinosaurs. Although de Ricqlès urged caution, arguing for an intermediate type of dinosaur physiology, a generation of paleontologists has come to believe that dinosaur bone is mammalianlike. In the 1980’s, however, Bakker’s contention began to be questioned, as a number of scientists found growth rings in the bones of various dinosaurs that are much like those in modern reptiles. Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree. Recently, Chinsamy investigated the bones of two dinosaurs from the early Jurassic period (208-187 million years ago), and found that these bones also had growth rings; however, they were also partially fibro-lamellar in nature. Chinsamy’s work raises a question central to the debate over dinosaur physiology: did dinosaurs form fibro-lamellar bone because of an innately high metabolic rate associated with warm-bloodedness or because of periods of unusually fast growth that occurred under favorable environmental conditions? (Although modern reptiles generally do not form fibro-lamellar bone, juvenile crocodilesraised under optimal environmental conditions do.) This question remains unanswered; indeed, taking all the evidence into account, one cannot make a definitive statement about dinosaur physiology on the basis of dinosaur bone. It may be that dinosaurs had an intermediate pattern of bone structure because their physiology was neither typically reptilian, mammalian, nor avian.
The author of the passage would be most likely to agree that the "caution" (line 29) urged by de Ricqlès regarding claims about dinosaur physiology was
(A) unjustified by the evidence available to de Ricqlès
(B) unnecessary, given the work done by Bakker and his followers
(C) indicative of the prevailing scientific opinion at the time
(D) warranted, given certain subsequent findings of other scientists
(E) influential in the recent work of Chinsamy
[Reveal] Spoiler:
D


The primary purpose of the passage is to
(A) discuss the influence on other scientists of Bakker's argument concerning the warm-bloodedness of dinosaurs
(B) provide evidence that supports the claim that dinosaurs were cold-blooded
(C) challenge the contention that dinosaur bone tissue is innately fibro-lamellar
(D) evaluate the claim that dinosaur bone tissue provides evidence for the warmbloodedness of dinosaurs
(E) resolve the disagreement between de Ricqlès and Bakker over the nature of dinosaur physiology
[Reveal] Spoiler:
D


According to the passage, the discovery of growth rings in the bones of certain dinosaurs served to undermine which of the following claims?
(A) That modern reptiles are related to dinosaurs
(B) That bone growth in dinosaurs was periodic in nature
(C) That dinosaurs were warm-blooded
(D) That dinosaurs had an intermediate type of physiology
(E) That fibro-lamellar bone is the product of a rapid growth rate
[Reveal] Spoiler:
C


The author of the passage mentions bone growth patterns in juvenile crocodiles most likely in order to provide support for the argument that reptiles are not related to dinosaurs
(A) provide support for the argument that reptiles are not related to dinosaurs
(B) undermine the claim that most reptiles are slow-growing
(C) offer an explanation as to why juvenile crocodiles differ from most modern reptiles
(D) suggest the juvenile crocodiles have a type of physiology intermediate between-f mammals and that of reptiles
(E) suggest that the presence of fibro-lamellar bone does not resolve the debate over dinosaur physiology
[Reveal] Spoiler:
E




I got the first two wrong ... can anyone give explanation for the answers ??
Director
Director
User avatar
Status:
Joined: 24 Jul 2011
Posts: 557
GMAT 1: 780 Q51 V48
GRE 1: 1540 Q800 V740
Followers: 64

Kudos [?]: 295 [0], given: 11

Re: Scientists studying the physiology of dinosaurs have long de [#permalink] New post 02 Feb 2013, 01:12
Q1. (D) is correct. The caution was warranted, given the contradictory findings of other scientists later

Q2. This is a tough one. (A) is out, because evaluating Bakker's argument is not the main purpose. (B) is not supported so that is out too. (C) is incorrect, because the structure of the tissue came about to support the main argument. It was not the main argument itself. (D) encapsulates the overall passage well and is correct. (E) The disagreement between them came about later. It does not encapsulate the paragraph.

Q3. (C) it is. The fact that these rings are found in reptile bones contradicts and undermines the finding that dinosaurs were warm blooded.

Q4. This is a relatively easy one - straight from the passage. (E) it is.
_________________

GyanOne | http://www.GyanOne.com | +91 9899831738

Get a free detailed MBA profile evaluation

Top MBA Rankings and MBA Admissions blog


Image

Intern
Intern
avatar
Joined: 10 Sep 2013
Posts: 41
Location: United States
Concentration: Strategy, Operations
GMAT Date: 12-10-2013
GPA: 3.5
WE: Operations (Manufacturing)
Followers: 0

Kudos [?]: 13 [0], given: 15

Re: Scientists studying the physiology of dinosaurs have long [#permalink] New post 07 Dec 2013, 08:23
EDCE
Got first one wrong ...
Manager
Manager
avatar
Joined: 21 Aug 2013
Posts: 113
Schools: ISB '15
Followers: 2

Kudos [?]: 11 [0], given: 54

Re: Scientists studying the physiology of dinosaurs have long [#permalink] New post 11 Dec 2013, 02:48
DDCD
got the last one wrong.....:(
_________________

Veritas Prep - 650
MGMAT 1 590
MGMAT 2 640 (V48/Q31)

Please help the community by giving Kudos.

Re: Scientists studying the physiology of dinosaurs have long   [#permalink] 11 Dec 2013, 02:48
    Similar topics Author Replies Last post
Similar
Topics:
4 Scientists studying climate change have found that one of nitin6305 6 12 Aug 2013, 13:45
Experts publish their posts in the topic RC : Scientists studying the physiology of Dinosaurss akshaygaur 2 08 Nov 2012, 07:07
7 Journal: In several physiological studies, subjects were GMATmission 15 15 Oct 2011, 03:38
1 Experts publish their posts in the topic How long have you been studying for the GMAT? Nach0 15 08 Mar 2009, 11:42
2 Experts publish their posts in the topic Scientists studying climate change have found that one of rpmodi 8 23 Jun 2008, 23:21
Display posts from previous: Sort by

Scientists studying the physiology of dinosaurs have long

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.