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# Birds need so much food energy to maintain their body

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Birds need so much food energy to maintain their body [#permalink]

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07 Jul 2004, 10:57
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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 a 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 one 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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07 Jul 2004, 11:44
About 2 min. I'll go with C and explain a bit later
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Paul

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07 Jul 2004, 11:52
A) This contradicts the premise and is a given, not an assumption
Quote:
a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement

B) out of scope
C) Although nectar gives more energy, if it takes nectar eating birds more time to eat, how can we say that those nectar-birds spend less time eating?
D) This is given by the premise and is NOT an assumption:
Quote:
a comparison of a bird of a seed-eating species to a bird of a nectar-eating species that has the same overall energy requirement

same overall energy req. = same body temperature
E) out of scope
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Paul

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07 Jul 2004, 12:01
boksana: assuming that your "OK" doesn't necessarily mean that Paul's answer is correct, my answer to this would be D

Paul, as per your logic, even A should be correct. Essentially you are negating what is stated in the question and so does A!

The questions wants us to identify a "questionable assumption" which I think means that it is an explicit assumption made in the argument but is questionable based on "I don't know what!"

1 min 48s (hope it is not down the drain!)
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07 Jul 2004, 12:22
OA is C
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07 Jul 2004, 13:10
Well my FA was also D. C was equally near.
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07 Jul 2004, 23:47
i think D is Out of scope her.

I believe C is the best answer. i agree with paul explanation.

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08 Jul 2004, 03:08
Hi All,

In retrospect, the answer C looks like an inference. It does not look like an assumption(unstated premise/evidence).

The argument clearly states that the seed-eating bird spends more time eating than does the nectar-eating bird.

Tha answer C says that 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

Thus, C is just a paraphrase of the above sentence in the argument. A paraphrase can be an inference but not an assumption.

Do let me know your views. Probably, I might be 'out of scope'.

boksana wrote:
Birds need so much food energy to maintain their body temperatures that some of them spend most of their time eating. But a 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 one 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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Re: Birds need so much food energy to maintain their body [#permalink]

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03 Nov 2015, 02:15
Choice C is correct.

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…When we say that Mifune must be spending more time eating seeds than does Rossi eating nectar, accepting the fact that the same amount of nectar provides more energy than do seeds, it is a must that the time taken by Rossi is not more than that by Mifune because if that were the case, it leaves one possibility open that can counter the conclusion…equation 1: if x amount of seeds gives energy= y…equation 2: if x amount of nectar gives energy= 2y…We cannot say with certainty that the one opting for equation 1 is spending more time eating than do the one who opts of equation 2 if we do not know about how much time each takes to consume the same amount of seed or nectar…Now if we say that Mifune is spending more time eating seeds then do Rossi, we must accept that the same amount of nectar is consumed by Rossi in a time which is either same or less than what Mifune takes to consume the same amount.
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Re: Birds need so much food energy to maintain their body   [#permalink] 03 Nov 2015, 02:15
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