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

It is currently 01 Aug 2014, 21:19

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

Biological functions of many plants and animals vary in

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
User avatar
Joined: 17 Jul 2008
Posts: 251
Followers: 2

Kudos [?]: 27 [0], given: 29

GMAT Tests User
Biological functions of many plants and animals vary in [#permalink] New post 18 Jul 2008, 00:33
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

67% (02:17) correct 33% (00:57) wrong based on 17 sessions
72. Biological functions of many plants and animals vary in cycles that are repeated every 24 hours. It is tempting to suppose that alteration in the intensity of incident light is the stimulus that controls these daily biological rhythms. But there is much evidence to contradict this hypothesis.

Which of the following, if known, is evidence that contradicts the hypothesis stated in lines 2-5 above?

(A) Human body temperature varies throughout the
day, with the maximum occurring in the late afternoon and the minimum in the morning.
(B) While some animals, such as the robin, are
more active during the day, others, such as mice, show greater activity at night
(C) When people move from one time zone to another,their biological rhythms adjust in a matter of days to the periods of sunlight and darkness in the new zone.
(D) Certain single-cell plants display daily
biological rhythms even when the part of the cell containing the nucleus is removed.
(E) Even when exposed to constant light intensity around the clock, some algae display rates of photosynthesis that are much greater during daylight hours than at night.

Can anyone explain the logic of the questions and answers behind it?
_________________

Please give kudos if you enjoy the explanations that I have given. Thanks :)

Senior Manager
Senior Manager
User avatar
Joined: 14 Mar 2007
Posts: 319
Location: Hungary
Followers: 1

Kudos [?]: 16 [0], given: 3

GMAT Tests User
Re: CR-Biological Rhythmes [#permalink] New post 18 Jul 2008, 01:21
I think the answer is E.

Constant light is applied, therefore the animals' function should be constant, but E says that the animals' function changes.
1 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 17 Jul 2008
Posts: 251
Followers: 2

Kudos [?]: 27 [1] , given: 29

GMAT Tests User
Re: CR-Biological Rhythmes [#permalink] New post 18 Jul 2008, 05:41
1
This post received
KUDOS
Doesn't it explain that the livings actions' change is related with light therefore related with timing?

The official answer is E, yet about the logic I did not get anything. In E it explains algea is effected by sunlight so it does show many reactions in daylight than night. So if the question asks us to undermine not support the conclusion. There has to lie another logic.

_________________

Please give kudos if you enjoy the explanations that I have given. Thanks :)

Senior Manager
Senior Manager
avatar
Joined: 07 Jan 2008
Posts: 297
Followers: 1

Kudos [?]: 18 [0], given: 0

GMAT Tests User
Re: CR-Biological Rhythmes [#permalink] New post 23 Jul 2008, 15:56
Got this one wrong. Wanted to bump up the thread for others to argue! So, please share your thoughts not just the answer :!:
Director
Director
avatar
Joined: 30 Jun 2007
Posts: 793
Followers: 1

Kudos [?]: 102 [0], given: 0

GMAT Tests User
Re: CR-Biological Rhythmes [#permalink] New post 23 Jul 2008, 16:34
Stated Hypothesis: Intensity of Incident light has direct relation to the biological rhythms.

The answer choice that weakens the hypothesis will introduce facts that varying intensity also produces the same rhythms effect or same light intensity produces varying rhythms.


(A) Human body temperature varies throughout the day, with the maximum occurring in the late afternoon and the minimum in the morning. [ Yes, supports the hypothesis – eliminate it]

(B) While some animals, such as the robin, are more active during the day, others, such as mice, show greater activity at night [ Direct or inverse relation – no effect]

(C) When people move from one time zone to another, their biological rhythms adjust in a matter of days to the periods of sunlight and darkness in the new zone. [Irrelevant – When biological rhythms get adjusted – eliminate it]

(D) Certain single-cell plants display daily biological rhythms even when the part of the cell containing the nucleus is removed. [irrelevant – eliminate it]

(E) Even when exposed to constant light intensity around the clock, some algae display rates of photosynthesis that are much greater during daylight hours than at night. [Hold it]

Answer: E
Manager
Manager
User avatar
Joined: 01 Oct 2010
Posts: 83
Location: United States (NC)
GPA: 2.3
WE: Information Technology (Computer Software)
Followers: 1

Kudos [?]: 18 [0], given: 115

GMAT ToolKit User
Re: Biological functions of many plants and animals vary in [#permalink] New post 20 Apr 2012, 23:56
Is this a question of Cause and Effect Relationship? If yes, then does answer choice E state that there is an alternate cause to the effect that is hypothesized?
_________________

---------------------------------------------------------------
Consider to give me kudos if my post helped you.

Manager
Manager
User avatar
Joined: 01 Nov 2010
Posts: 183
Location: Zürich, Switzerland
Followers: 2

Kudos [?]: 15 [0], given: 20

Re: Biological functions of many plants and animals vary in [#permalink] New post 21 Apr 2012, 10:05
perfectstranger wrote:
72. Biological functions of many plants and animals vary in cycles that are repeated every 24 hours. It is tempting to suppose that alteration in the intensity of incident light is the stimulus that controls these daily biological rhythms. But there is much evidence to contradict this hypothesis.

Which of the following, if known, is evidence that contradicts the hypothesis stated in lines 2-5 above?

(A) Human body temperature varies throughout the
day, with the maximum occurring in the late afternoon and the minimum in the morning.
(B) While some animals, such as the robin, are
more active during the day, others, such as mice, show greater activity at night
(C) When people move from one time zone to another,their biological rhythms adjust in a matter of days to the periods of sunlight and darkness in the new zone.
(D) Certain single-cell plants display daily
biological rhythms even when the part of the cell containing the nucleus is removed.
(E) Even when exposed to constant light intensity around the clock, some algae display rates of photosynthesis that are much greater during daylight hours than at night.

Can anyone explain the logic of the questions and answers behind it?



Answer E is the best choice. E indicates there is no impact of variations in the sunlight on the rates of photosynthesis performed by algae.
Intern
Intern
avatar
Joined: 26 May 2012
Posts: 21
Concentration: Marketing, Technology
GMAT Date: 09-17-2012
Followers: 1

Kudos [?]: 2 [0], given: 7

Reviews Badge
Re: Biological functions of many plants and animals vary in [#permalink] New post 17 Feb 2013, 20:24
perfectstranger wrote:
72. Biological functions of many plants and animals vary in cycles that are repeated every 24 hours. It is tempting to suppose that alteration in the intensity of incident light is the stimulus that controls these daily biological rhythms. But there is much evidence to contradict this hypothesis.

Which of the following, if known, is evidence that contradicts the hypothesis stated in lines 2-5 above?

(A) Human body temperature varies throughout the
day, with the maximum occurring in the late afternoon and the minimum in the morning.
(B) While some animals, such as the robin, are
more active during the day, others, such as mice, show greater activity at night
(C) When people move from one time zone to another,their biological rhythms adjust in a matter of days to the periods of sunlight and darkness in the new zone.
(D) Certain single-cell plants display daily
biological rhythms even when the part of the cell containing the nucleus is removed.
(E) Even when exposed to constant light intensity around the clock, some algae display rates of photosynthesis that are much greater during daylight hours than at night.

Can anyone explain the logic of the questions and answers behind it?


But E compares rates of photosynthesis in the day and night. Further E states that in constant light, the photosynthesis is greater than at night, thus light does have an effect, which IMO does not contradict the conclusion.

It is obvious that I am missing something vital here.
GMAT Pill Representative
User avatar
Joined: 07 Nov 2012
Posts: 346
Schools: LBS '14 (A)
GMAT 1: 770 Q48 V48
Followers: 135

Kudos [?]: 168 [0], given: 4

Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 00:59
Hi - I agree.

E is not the correct answer. It supports the conclusion that light is not the key thing that causes creatures to distinguish between day and night...

James
_________________

Former GMAT Pill student, now on staff. Used GMATPILL OG 12 and nothing else: 770 (48,48) & 6.0



... and more

Intern
Intern
avatar
Joined: 26 May 2012
Posts: 21
Concentration: Marketing, Technology
GMAT Date: 09-17-2012
Followers: 1

Kudos [?]: 2 [0], given: 7

Reviews Badge
Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 02:13
plumber250 wrote:
Hi - I agree.

E is not the correct answer. It supports the conclusion that light is not the key thing that causes creatures to distinguish between day and night...

James


Hi James,

But the OA is E. Sometimes I wonder about the accuracy of CR's reasoning for the OAs.
GMAT Pill Representative
User avatar
Joined: 07 Nov 2012
Posts: 346
Schools: LBS '14 (A)
GMAT 1: 770 Q48 V48
Followers: 135

Kudos [?]: 168 [0], given: 4

Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 02:53
Can we see the Reasoning behind the OA?
_________________

Former GMAT Pill student, now on staff. Used GMATPILL OG 12 and nothing else: 770 (48,48) & 6.0



... and more

Intern
Intern
avatar
Joined: 26 May 2012
Posts: 21
Concentration: Marketing, Technology
GMAT Date: 09-17-2012
Followers: 1

Kudos [?]: 2 [0], given: 7

Reviews Badge
Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 03:06
plumber250 wrote:
Can we see the Reasoning behind the OA?


Situation:
Biological rhythms of many plans and animals work in 24 hr cycles. The alteration of the intensity of light is thought to control these cycles.

Reasoning:
What evidence the hypothesis that light is the controlling stimulus?
Look for an example demonstrating that the intensity of light cannot be the controlling stimulus of the 24 hr cycle. Algae exposed to a constant intensity of light throughout the 24 hr cycle nevertheless exhibit a far greater activity of biological functions during daylight hours than at night. The ex. of algae thus contradicts the hypothesis.
GMAT Pill Representative
User avatar
Joined: 07 Nov 2012
Posts: 346
Schools: LBS '14 (A)
GMAT 1: 770 Q48 V48
Followers: 135

Kudos [?]: 168 [0], given: 4

Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 03:12
Right,

I think I get it, the key issue is the phrase 'in lines 2-5' but then in the printed passage it is not clear what those are.

I and others assumed that it refers to the overall conclusion of the argument.

In fact 'lines 2-5' must be the section that talks about the initial hypothesis.

A 'cut and paste' issue from another source.....
_________________

Former GMAT Pill student, now on staff. Used GMATPILL OG 12 and nothing else: 770 (48,48) & 6.0



... and more

Intern
Intern
avatar
Joined: 26 May 2012
Posts: 21
Concentration: Marketing, Technology
GMAT Date: 09-17-2012
Followers: 1

Kudos [?]: 2 [0], given: 7

Reviews Badge
Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 03:21
plumber250 wrote:
Right,

I think I get it, the key issue is the phrase 'in lines 2-5' but then in the printed passage it is not clear what those are.

I and others assumed that it refers to the overall conclusion of the argument.

In fact 'lines 2-5' must be the section that talks about the initial hypothesis.

A 'cut and paste' issue from another source.....



Sorry mate I dont follow where you're coming from.
GMAT Pill Representative
User avatar
Joined: 07 Nov 2012
Posts: 346
Schools: LBS '14 (A)
GMAT 1: 770 Q48 V48
Followers: 135

Kudos [?]: 168 [0], given: 4

Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 03:24
If the passage was written like this (rough cut and paste)

72. Biological functions of many plants and animals
vary in cycles that are repeated every 24 hours. It is
temptingto suppose that alteration in the intensity
of incident light is the stimulus that controls
these daily biological rhythms.

But there is much evidence to contradict this hypothesis.

The relevant section ('in lines 2-5') is highlighted.

So if you look at it like that, then the official answer explanation makes perfect sense
_________________

Former GMAT Pill student, now on staff. Used GMATPILL OG 12 and nothing else: 770 (48,48) & 6.0



... and more

Intern
Intern
avatar
Joined: 26 May 2012
Posts: 21
Concentration: Marketing, Technology
GMAT Date: 09-17-2012
Followers: 1

Kudos [?]: 2 [0], given: 7

Reviews Badge
Re: Biological functions of many plants and animals vary in [#permalink] New post 18 Feb 2013, 03:32
plumber250 wrote:
If the passage was written like this (rough cut and paste)

72. Biological functions of many plants and animals
vary in cycles that are repeated every 24 hours. It is
temptingto suppose that alteration in the intensity
of incident light is the stimulus that controls
these daily biological rhythms.

But there is much evidence to contradict this hypothesis.

The relevant section ('in lines 2-5') is highlighted.

So if you look at it like that, then the official answer explanation makes perfect sense



I understand what they mean now, by saying "....than at night" they actually mean at night when the light was still incident on the algae. If they would have made the sentence parallel by saying "... during night hours" I may have gotten it.

This was a good one! Thanks for your help!
Re: Biological functions of many plants and animals vary in   [#permalink] 18 Feb 2013, 03:32
    Similar topics Author Replies Last post
Similar
Topics:
1 Some plants have extremely sensitive biological noboru 16 26 Sep 2010, 09:27
2 Plants&Animals RaviChandra 11 17 Apr 2010, 00:12
Experts publish their posts in the topic Some plants have extremely sensitive biological farend 4 08 Feb 2008, 06:10
The number of plants and animal species that humans are shailu22 13 25 Mar 2006, 18:08
Charles Darwin argued that Plant and Animal species were ruhi 8 11 Nov 2004, 22:50
Display posts from previous: Sort by

Biological functions of many plants and animals vary in

  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®.