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Caffeine can kill or inhibit the growth of the larvae

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Caffeine can kill or inhibit the growth of the larvae [#permalink]

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New post 12 Oct 2015, 09:03
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Caffeine can kill or inhibit the growth of the larvae of several species of insects. One recent experiment showed that tobacco hornworm larvae die when they ingest a preparation that consists in part of finely powdered tea leaves which contain caffeine. This result is evidence for the hypothesis that the presence of non-negligible quantities of caffeine in various parts of many diverse species of plants is not accidental but evolved as a defense for those plants.

The argument assumes that

(A) caffeine-producing plants are an important raw material in the manufacture of commercial insecticides

(B) caffeine is stored in leaves and other parts of caffeine-producing plants in concentrations roughly equal to the caffeine concentration of the preparation fed to the tobacco hornworm larvae

(C) caffeine-producing plants grow wherever insect larvae pose a major threat to indigenous plants or once posed a major threat to the ancestors of those plants

(D) the tobacco plant is among the plant species that produce caffeine for their own defense

(E) caffeine-producing plants or their ancestors have at some time been subject to being fed upon by creatures sensitive to caffeine

Source: Lsat Old Papers
[Reveal] Spoiler: OA

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Re: Caffeine can kill or inhibit the growth of the larvae [#permalink]

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New post 12 Oct 2015, 11:09
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The argument:
Caffeine (C) can kill or inhibit the growth of larvae of SEVERAL species of insect
Experiment: Tobacoo Hornworm larvae (THL) die when THL ingest C in even small quantities of tea leaves power (C)
Conclusion: Quantities of C in various plant is not accidental but evolved as a defense for those plant
Gap: From Tea Leave to Various C plants evolved as a defense
RaviChandra wrote:
Caffeine can kill or inhibit the growth of the larvae of several species of insects. One recent experiment showed that tobacco hornworm larvae die when they ingest a preparation that consists in part of finely powdered tea leaves which contain caffeine. This result is evidence for the hypothesis that the presence of non-negligible quantities of caffeine in various parts of many diverse species of plants is not accidental but evolved as a defense for those plants.

The argument assumes that

(A) caffeine-producing plants are an important raw material in the manufacture of commercial insecticides => irrelevant

(B) caffeine is stored in leaves and other parts of caffeine-producing plants in concentrations roughly equal to the caffeine concentration of the preparation fed to the tobacco hornworm larvae => Roughly equal, not creditable bridge to the GAP above

(C) caffeine-producing plants grow wherever insect larvae pose a major threat to indigenous plants or once posed a major threat to the ancestors of those plants => Irrelevant, the argument does not talk about whether indigenous or ancestor of those plant grow or not in accordance to the existence of lavae

(D) the tobacco plant is among the plant species that produce caffeine for their own defense => Irrelevant

(E) caffeine-producing plants or their ancestors have at some time been subject to being fed upon by creatures sensitive to caffeine
=> This is the correct answer. If not in which the C plants never interact with insect senstive to caffeine, these plants will not evolved a defense
Source: Lsat Old Papers

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Re: Caffeine can kill or inhibit the growth of the larvae [#permalink]

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New post 13 Oct 2015, 09:45
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I would go with E since only if the plants were fed once upon, they would start producing caffeine as a defence mechanism. If we negate E, the argument falls apart.

Regards,
Dom.

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Re: Caffeine can kill or inhibit the growth of the larvae [#permalink]

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New post 29 Oct 2017, 04:14
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Caffeine can kill or inhibit the growth of the larvae   [#permalink] 29 Oct 2017, 04:14
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