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# Birds need so much food energy to maintain their body

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Director
Joined: 17 Oct 2005
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Birds need so much food energy to maintain their body [#permalink]

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06 Dec 2005, 02:25
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Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But in comparison of a bird of a seed-eating species to a bird of a nectar eating species that has the same overall energy requirement would surely show that the seed-eating bird spends more time eating than does the nectar eating bird, since a given amount of nectar provides more energy than does the same amount of seeds.

The argument relies on which of the following questionable assumptions?

A) Birds of different species do not generally have the same overall energy requirements as each other

B) The nectar-eating bird does not sometimes also eat seeds

C) The time it takes for the nectar eating bird to eat a given amount of nectar is not longer than the time it takes the seed eating bird to eat the same amount of seeds

D) The seed eating bird does not have a lower body temperature than that of the nectar eating bird

E)The overall energy requirements of a given bird do not depend on factors such as the size of the bird, its nest-building habits, and the climate of the region in which it lives

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Director
Joined: 14 Sep 2005
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Location: South Korea

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14 Dec 2005, 18:28
X = the time a seed-eating bird spends eating seeds
Y = the time a nectar-eating bird spends eating nectar

A = the total amount of seeds eaten
B = the total amount of nectar eaten

Even if X > Y, it does not necessarily mean that A > B.

I vote for (D).
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Last edited by gamjatang on 15 Dec 2005, 01:35, edited 1 time in total.

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SVP
Joined: 24 Sep 2005
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14 Dec 2005, 21:47
one more vote for D

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SVP
Joined: 28 May 2005
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15 Dec 2005, 09:37
another vote for D.
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hey ya......

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Intern
Joined: 10 Dec 2005
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Location: India

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17 Dec 2005, 11:17
I go with C
since it is already stated in the passage that the energy requirement is same therefore D is not an assumption
if C is assumed then only it can be shown that the time spent by nectar eating bird to eat the requiered amount of nectar is less than that spent by a seed eating bird

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Senior Manager
Joined: 03 Nov 2005
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Location: Chicago, IL

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17 Dec 2005, 22:46
I thought it's C first, but than i changed my mind

A key assumption to this argument is that nectar eating species do not burn their energy faster than seed-eating species. If they did, they would need more food than seed-eating species to restore their energy. This calls overall conclusion of the argument into question.

D.
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17 Dec 2005, 22:46
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