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Resin is a plant secretion that hardens when exposed to air; fossilize

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Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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The Official Guide for GMAT Review 2018

Practice Question
Question No.: RC 467 ~ 470

Resin is a plant secretion that hardens when exposed to air; fossilized resin is called amber. Although Pliny in the first century recognized that amber was produced from “marrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks. Confusion also persists surrounding the term “resin,” which was defined before rigorous chemical analyses were available. Resin is often confused with gum, a substance produced in plants in response to bacterial infections, and with sap, an aqueous solution transported through certain plant tissues. Resin differs from both gum and sap in that scientists have not determined a physiological function for resin.

     In the 1950s, entomologists posited that resin may function to repel or attract insects. Fraenkel conjectured that plants initially produced resin in nonspecific chemical responses to insect attack and that, over time, plants evolved that produced resin with specific repellent effects. But some insect species, he noted, might overcome the repellent effects, actually becoming attracted to the resin. This might induce the insects to feed on those plants or aid them in securing a breeding site. Later researchers suggested that resin mediates the complex interdependence, or “coevolution,” of plants and insects over time. Such ideas led to the development of the specialized discipline of chemical ecology, which is concerned with the role of plant chemicals in interactions with other organisms and with the evolution and ecology of plant antiherbivore chemistry (plants' chemical defenses against attack by herbivores such as insects).

(Book Question: 467)
According to the passage, which of the following is true of plant antiherbivore chemistry?

(A) Changes in a plant's antiherbivore chemistry may affect insect feeding behavior.

(B) A plant's repellent effects often involve interactions between gum and resin.

(C) A plant's antiherbivore responses assist in combating bacterial infections.

(D) Plant antiherbivore chemistry plays only a minor role in the coevolution of plants and insects.

(E) Researchers first studied repellent effects in plants beginning in the 1950s.


(Book Question: 468)
Of the following topics, which would be most likely to be studied within the discipline of chemical ecology as it is described in the passage?

(A) Seeds that become attached to certain insects, which in turn carry away the seeds and aid in the reproductive cycle of the plant species in question

(B) An insect species that feeds on weeds detrimental to crop health and yield, and how these insects might aid in agricultural production

(C) The effects of deforestation on the life cycles of subtropical carnivorous plants and the insect species on which the plants feed

(D) The growth patterns of a particular species of plant that has proved remarkably resistant to herbicides

(E) Insects that develop a tolerance for feeding on a plant that had previously been toxic to them, and the resultant changes within that plant species


(Book Question: 469)
The author refers to “bacterial infections” (see line 11) most likely in order to

(A) describe the physiological function that gum performs in plants

(B) demonstrate that sap is not the only substance that is transported through a plant's tissues

(C) explain how modern chemical analysis has been used to clarify the function of resin

(D) show that gum cannot serve as an effective defense against herbivores

(E) give an example of how confusion has arisen with regard to the nature of resin


(Book Question: 470)
The author of the passage refers to Pliny most probably in order to

(A) give an example of how the nature of amber has been misunderstood in the past

(B) show that confusion about amber has long been more pervasive than confusion about resin

(C) make note of the first known reference to amber as a semiprecious gem

(D) point out an exception to a generalization about the history of people's understanding of amber

(E) demonstrate that Pliny believed amber to be a mineral

[Reveal] Spoiler: Question #1 OA
[Reveal] Spoiler: Question #2 OA
[Reveal] Spoiler: Question #3 OA
[Reveal] Spoiler: Question #4 OA

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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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New post 13 Jun 2017, 07:24
Quote:
Question 4

(Book Question: 470)
The author of the passage refers to Pliny most probably in order to

(A) give an example of how the nature of amber has been misunderstood in the past

(B) show that confusion about amber has long been more pervasive than confusion about resin

(C) make note of the first known reference to amber as a semiprecious gem

(D) point out an exception to a generalization about the history of people's understanding of amber

(E) demonstrate that Pliny believed amber to be a mineral


Quote:
Although Pliny in the first century recognized that amber was produced frommarrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks.


The passage states generally that amber has been widely misunderstood but cites Pliny as noting correctly, in the first century, that amber resulted from a substance discharged by trees.

GMATNinja Could you help to explain why (A) is incorrect?
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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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New post 13 Jun 2017, 11:36
hazelnut wrote:
Quote:
Question 4

(Book Question: 470)
The author of the passage refers to Pliny most probably in order to

(A) give an example of how the nature of amber has been misunderstood in the past

(B) show that confusion about amber has long been more pervasive than confusion about resin

(C) make note of the first known reference to amber as a semiprecious gem

(D) point out an exception to a generalization about the history of people's understanding of amber

(E) demonstrate that Pliny believed amber to be a mineral


Quote:
Although Pliny in the first century recognized that amber was produced frommarrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks.


The passage states generally that amber has been widely misunderstood but cites Pliny as noting correctly, in the first century, that amber resulted from a substance discharged by trees.

GMATNinja Could you help to explain why (A) is incorrect?


The sentence starts with the word Although, Pliny was the first known exception to the wide misconception of what Amber is.

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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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hazelnut wrote:
Quote:
Question 4

(Book Question: 470)
The author of the passage refers to Pliny most probably in order to

(A) give an example of how the nature of amber has been misunderstood in the past

(B) show that confusion about amber has long been more pervasive than confusion about resin

(C) make note of the first known reference to amber as a semiprecious gem

(D) point out an exception to a generalization about the history of people's understanding of amber

(E) demonstrate that Pliny believed amber to be a mineral


Quote:
Although Pliny in the first century recognized that amber was produced frommarrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks.


The passage states generally that amber has been widely misunderstood but cites Pliny as noting correctly, in the first century, that amber resulted from a substance discharged by trees.

GMATNinja Could you help to explain why (A) is incorrect?


hazelnut, if you take the statement "A" to be correct, then statement "E" should also be correct; both the statements are referring to the same meaning.
Pay close attention to the word "Although". It just changes the meaning of the entire statement.

Hope it helps.
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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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New post 14 Jun 2017, 09:31
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1. According to the passage, which of the following is true of plant antiherbivore chemistry?
(A) Changes in a plant's antiherbivore chemistry may affect insect feeding behavior. - CORRECT. "plants' chemical defenses against attack by herbivores such as insects" This clearly tells us that the chemicals will have an impact on the nature of interaction between insect and plant.
(B) A plant's repellent effects often involve interactions between gum and resin. -Irrelevant
(C) A plant's antiherbivore responses assist in combating bacterial infections. -Responses, if any, occur POST the infection
(D) Plant antiherbivore chemistry plays only a minor role in the coevolution of plants and insects. -Theory is concerned with plant & insect interaction
(E) Researchers first studied repellent effects in plants beginning in the 1950s. -Irrelevant

2. Of the following topics, which would be most likely to be studied within the discipline of chemical ecology as it is described in the passage?
Chemical ecology talks about the interaction between chemical and insect.
(A) Seeds that become attached to certain insects, which in turn carry away the seeds and aid in the reproductive cycle of the plant species in question -Seeds are not chemicals. Incorrect.
(B) An insect species that feeds on weeds detrimental to crop health and yield, and how these insects might aid in agricultural production -Insect aid in agriculture? Irrelevant
(C) The effects of deforestation on the life cycles of subtropical carnivorous plants and the insect species on which the plants feed -Effect of deforestation? Irrelevant
(D) The growth patterns of a particular species of plant that has proved remarkably resistant to herbicides -Growth pattern? Irrelevant
(E) Insects that develop a tolerance for feeding on a plant that had previously been toxic to them, and the resultant changes within that plant species -CORRECT. Correctly develops a relationship between the toxic chemical and insect.

3. The author refers to “bacterial infections” (see line 11) most likely in order to
(A) describe the physiological function that gum performs in plants -CORRECT. "Resin differs from both gum and sap in that scientists have not determined a physiological function for resin" -This line is followed by the line that defines the function of gum. Thus we can infer that "bacterial infections" is referring to the physiological function of gum
(B) demonstrate that sap is not the only substance that is transported through a plant's tissues -Out of scope
(C) explain how modern chemical analysis has been used to clarify the function of resin -Incorrect
(D) show that gum cannot serve as an effective defense against herbivores -Out of scope
(E) give an example of how confusion has arisen with regard to the nature of resin -The passage does explain the term gum to define the confusion between the two, but "bacterial infections" doesn't describe the confusion. It merely explains the function of gum

4. The author of the passage refers to Pliny most probably in order to
"AlthoughPliny in the first century recognized that amber was produced from “marrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks"
(A) give an example of how the nature of amber has been misunderstood in the past -It's the opposite of the statement made by the author
(B) show that confusion about amber has long been more pervasive than confusion about resin -The passage doesn't say so
(C) make note of the first known reference to amber as a semiprecious gem -First known reference is nowhere depicted in the passage.
(D) point out an exception to a generalization about the history of people's understanding of amber -CORRECT. The passage states that Pliny thought of the amber as a product of marrow discharged by the trees.
(E) demonstrate that Pliny believed amber to be a mineral -It is the opposite of what passage states
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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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New post 21 Jul 2017, 19:09
hazelnut wrote:
Quote:
Question 4

(Book Question: 470)
The author of the passage refers to Pliny most probably in order to

(A) give an example of how the nature of amber has been misunderstood in the past

(B) show that confusion about amber has long been more pervasive than confusion about resin

(C) make note of the first known reference to amber as a semiprecious gem

(D) point out an exception to a generalization about the history of people's understanding of amber

(E) demonstrate that Pliny believed amber to be a mineral


Quote:
Although Pliny in the first century recognized that amber was produced frommarrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks.


The passage states generally that amber has been widely misunderstood but cites Pliny as noting correctly, in the first century, that amber resulted from a substance discharged by trees.

GMATNinja Could you help to explain why (A) is incorrect?

Thanks praneet87 and gmatexam439!

Indeed, Pliny correctly recognized that amber was produced from “marrow discharged by trees,” so, in the example with Pliny, amber is NOT misunderstood. In general, amber has been widely misunderstood, so the Pliny example is an exception.
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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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New post 22 Jul 2017, 03:04
The author refers to “bacterial infections” (see line 11) most likely in order to

(A) describe the physiological function that gum performs in plants

(B) demonstrate that sap is not the only substance that is transported through a plant's tissues

(C) explain how modern chemical analysis has been used to clarify the function of resin

(D) show that gum cannot serve as an effective defense against herbivores

(E) give an example of how confusion has arisen with regard to the nature of resin

The answer to this question is A
E is a trap answer .
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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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New post 07 Aug 2017, 07:00
gmatexam439 wrote:
1. According to the passage, which of the following is true of plant antiherbivore chemistry?
(A) Changes in a plant's antiherbivore chemistry may affect insect feeding behavior. - CORRECT. "plants' chemical defenses against attack by herbivores such as insects" This clearly tells us that the chemicals will have an impact on the nature of interaction between insect and plant.
(B) A plant's repellent effects often involve interactions between gum and resin. -Irrelevant
(C) A plant's antiherbivore responses assist in combating bacterial infections. -Responses, if any, occur POST the infection
(D) Plant antiherbivore chemistry plays only a minor role in the coevolution of plants and insects. -Theory is concerned with plant & insect interaction
(E) Researchers first studied repellent effects in plants beginning in the 1950s. -Irrelevant

2. Of the following topics, which would be most likely to be studied within the discipline of chemical ecology as it is described in the passage?
Chemical ecology talks about the interaction between chemical and insect.
(A) Seeds that become attached to certain insects, which in turn carry away the seeds and aid in the reproductive cycle of the plant species in question -Seeds are not chemicals. Incorrect.
(B) An insect species that feeds on weeds detrimental to crop health and yield, and how these insects might aid in agricultural production -Insect aid in agriculture? Irrelevant
(C) The effects of deforestation on the life cycles of subtropical carnivorous plants and the insect species on which the plants feed -Effect of deforestation? Irrelevant
(D) The growth patterns of a particular species of plant that has proved remarkably resistant to herbicides -Growth pattern? Irrelevant
(E) Insects that develop a tolerance for feeding on a plant that had previously been toxic to them, and the resultant changes within that plant species -CORRECT. Correctly develops a relationship between the toxic chemical and insect.

3. The author refers to “bacterial infections” (see line 11) most likely in order to
(A) describe the physiological function that gum performs in plants -CORRECT. "Resin differs from both gum and sap in that scientists have not determined a physiological function for resin" -This line is followed by the line that defines the function of gum. Thus we can infer that "bacterial infections" is referring to the physiological function of gum
(B) demonstrate that sap is not the only substance that is transported through a plant's tissues -Out of scope
(C) explain how modern chemical analysis has been used to clarify the function of resin -Incorrect
(D) show that gum cannot serve as an effective defense against herbivores -Out of scope
(E) give an example of how confusion has arisen with regard to the nature of resin -The passage does explain the term gum to define the confusion between the two, but "bacterial infections" doesn't describe the confusion. It merely explains the function of gum

4. The author of the passage refers to Pliny most probably in order to
"AlthoughPliny in the first century recognized that amber was produced from “marrow discharged by trees,” amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks"
(A) give an example of how the nature of amber has been misunderstood in the past -It's the opposite of the statement made by the author
(B) show that confusion about amber has long been more pervasive than confusion about resin -The passage doesn't say so
(C) make note of the first known reference to amber as a semiprecious gem -First known reference is nowhere depicted in the passage.
(D) point out an exception to a generalization about the history of people's understanding of amber -CORRECT. The passage states that Pliny thought of the amber as a product of marrow discharged by the trees.
(E) demonstrate that Pliny believed amber to be a mineral -It is the opposite of what passage states



3. The author refers to “bacterial infections” (see line 11) most likely in order to
(A) describe the physiological function that gum performs in plants -CORRECT. "Resin differs from both gum and sap in that scientists have not determined a physiological function for resin" -This line is followed by the line that defines the function of gum. Thus we can infer that "bacterial infections" is referring to the physiological function of gum
(B) demonstrate that sap is not the only substance that is transported through a plant's tissues -Out of scope
(C) explain how modern chemical analysis has been used to clarify the function of resin -Incorrect
(D) show that gum cannot serve as an effective defense against herbivores -Out of scope
(E) give an example of how confusion has arisen with regard to the nature of resin -The passage does explain the term gum to define the confusion between the two, but "bacterial infections" doesn't describe the confusion. It merely explains the function of gum

for this question it is confusing that
1. gum is a product or result of 'physiological function=bacterial infections' ....passage says "Resin is often confused with gum, a substance produced in plants in response to bacterial infections"

or

2. gum is a performer of 'physiological function=bacterial infections'....ans option says "bacterial infections describe the physiological function that gum performs."

can anyone shed some light on these two conflicting points.

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Re: Resin is a plant secretion that hardens when exposed to air; fossilize [#permalink]

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New post 17 Aug 2017, 07:54
jokschmer wrote:
3. The author refers to “bacterial infections” (see line 11) most likely in order to
(A) describe the physiological function that gum performs in plants -CORRECT. "Resin differs from both gum and sap in that scientists have not determined a physiological function for resin" -This line is followed by the line that defines the function of gum. Thus we can infer that "bacterial infections" is referring to the physiological function of gum
(B) demonstrate that sap is not the only substance that is transported through a plant's tissues -Out of scope
(C) explain how modern chemical analysis has been used to clarify the function of resin -Incorrect
(D) show that gum cannot serve as an effective defense against herbivores -Out of scope
(E) give an example of how confusion has arisen with regard to the nature of resin -The passage does explain the term gum to define the confusion between the two, but "bacterial infections" doesn't describe the confusion. It merely explains the function of gum

for this question it is confusing that
1. gum is a product or result of 'physiological function=bacterial infections' ....passage says "Resin is often confused with gum, a substance produced in plants in response to bacterial infections"

or

2. gum is a performer of 'physiological function=bacterial infections'....ans option says "bacterial infections describe the physiological function that gum performs."

can anyone shed some light on these two conflicting points.

A bacterial infection is not the physiological function. The physiological function is the mechanism by which a plant reacts to a bacterial infection (by producing gum).

The author refers to “bacterial infections” in order to describe the plant's physiological response to the bacterial infection. This physiological response is to produce gum.

Does that answer your question?
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