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Determining whether a given population of animals constitutes a [#permalink]
Why is option A incorrect in Q55?
and
Why is option E incorrect in Q57?
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Re: Determining whether a given population of animals constitutes a [#permalink]
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The author of the passage mentions “groups that live in different places” (in line 21) most probably in order to
pre-thinking - there is a flaw in concept, that is explained using this line.
A. point out a theoretical inconsistency in the biological species concept
B. offer evidence in support of the biological species concept
C. identify an obstacle to the application of the biological species concept------ correct
D. note an instance in which phenotype classification is customarily used
E. describe an alternative to the biological species concept
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Re: Determining whether a given population of animals constitutes a [#permalink]
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Which of the following best describes the function of lines 10-13 [First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature.]?
Pre-thinking : before this line, they gave the definition of a study. but called that idea very restrictive. these lines are defining that restriction.

I first selected B and E. one of them should be answer.
B. It develops a point about the biological species concept made in the previous sentence. --- correct.
E. It demonstrates why the biological species concept is invalid. --- so first study is true for some part, while false for rest. but is it really proving the study wrong. what if this line is true. then are you sure that this is of same group. this is not 100% true choice.
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Re: Determining whether a given population of animals constitutes a [#permalink]
(Book Question: 54)
The passage is primarily concerned with

(A) describing the development of the biological species concept
(B) responding to a critique of reproductive compatibility as a criterion for defining a species
(C) considering two different approaches to identifying biological species
(D) pointing out the advantage of one method of distinguishing related species
(E) identifying an obstacle to the classification of biological species


Why is option B incorrect? We are sort of analysing the reproductive compatibility as a criterion.
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Re: Determining whether a given population of animals constitutes a [#permalink]
(Book Question: 57)
Which of the following best describes the function of lines 10-13 [First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature.]?

(A) It elaborates the definition of the biological species concept given in a previous sentence.
(B) It develops a point about the biological species concept made in the previous sentence.
(C) It states the author’s central point about the biological species concept.
(D) It identifies a central assumption underlying the biological species concept.
(E) It demonstrates why the biological species concept is invalid.


I understand why option B is correct. Just to confirm, if the previous sentence would have been "According to this view, a species is a group of animals that can mate with one another to produce fertile offspring but cannot mate successfully with members of a different group" rather than "Yet this idea can be too restrictive", then option E would have been a correct choice?
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Re: Determining whether a given population of animals constitutes a [#permalink]
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(1) The passage is primarily concerned with

In the first paragraph, one way to define/identify species distinction is suggested and three reasons are given explaining why this particular method (way) may not be feasible. In the second paragraph, a different method/concept is suggested that people can use in order to determine ''distinction'' among species. Hence, we can reasonably infer that the main idea of the passage is to highlight two different approaches to determining ''distinction'' among species.

This school of thought is perfectly reflected in (C).

(C) considering two different approaches to identifying biological species

Hence, (C) is the right answer choice.

(2) The author of the passage mentions “groups that live in different places” (in line 21) most probably in order to

if you read the whole sentence that contains this highlighted text, we have "A third problem with the biological species concept is that investigators cannot always determine whether two groups that live in different places are capable of interbreeding". From this entire sentence, we can reasonably infer that the highlighted text is a part of a reason that explains why biological species concept to determine species ''distinction'' may not be feasible. This thought is perfectly reflected in (C)

(C) identify an obstacle to the application of the biological species concept

Hence, (C) is the right answer choice.

(3) With which of the following statements regarding the classification of individual species would the author most likely agree?

In the first line of the second paragraph, we have ''When the biological species concept is difficult to apply, some investigators use phenotype, an organism’s observable characteristics, instead''. This would reflect what (A) mentions perfectly.

(A) Phenotype comparison may help to classify species when application of the biological species concept proves inconclusive.

Hence, (A) is the right answer choice.

(4) Which of the following best describes the function of lines 10-13 [First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature.]?

If you read the sentence prior to the highlighted sentence of the first paragraph, you can see that the ''three reasons'' that follows this key sentence actually supports the idea/assertion made in this key sentence (where the key sentence is "Yet this idea can be too restrictive"). This is exactly what (B) mentions

(B) It develops a point about the biological species concept made in the previous sentence.

Hence, (B) is the right answer choice.
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