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06 Apr 2011, 07:23
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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Question Stats:
65% (02:29) correct
35%
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wrong
based on 1122
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False chicory's taproot is always one half as long as the plant is tall. Furthermore, the more rain false chicory receives, the taller it tends to grow. In fact, false chicory plants that receive greater than twice the average rainfall of the species' usual habitat always reach above-average heights for false chicory.
If the statements above are true, then which one of the following must also be true?
(A) If two false chicory plants differ in height, then it is likely that the one with the shorter taproot has received less than twice the average rainfall of the species' usual habitat.
(B) If a false chicory plant has a longer-than average taproot, then it is likely to have received more than twice the average rainfall of the species' usual habitat.
(C) It is not possible for a false chicory plant to receive only the average amount of rainfall of the species' usual habitat and be of above average height.
(D) If the plants in one group of false chicory are not taller than those in another group of false chicory, then the two groups must have received the same amount of rainfall.
(E) If a false chicory plant receives greater than twice the average rainfall of the species' usual habitat, then it will have a longer taproot than that of an average-sized false chicory plant.
If the statements above are true, then which one of the following must also be true?
(A) If two false chicory plants differ in height, then it is likely that the one with the shorter taproot has received less than twice the average rainfall of the species' usual habitat.
(B) If a false chicory plant has a longer-than average taproot, then it is likely to have received more than twice the average rainfall of the species' usual habitat.
(C) It is not possible for a false chicory plant to receive only the average amount of rainfall of the species' usual habitat and be of above average height.
(D) If the plants in one group of false chicory are not taller than those in another group of false chicory, then the two groups must have received the same amount of rainfall.
(E) If a false chicory plant receives greater than twice the average rainfall of the species' usual habitat, then it will have a longer taproot than that of an average-sized false chicory plant.
tuanquang269
Posts: 376
11 Jun 2012, 02:21
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The argument that contains many words makes the question become harder to solve. To make the argument easier. I will define the "False chicory plan" = X
=> Argument Evaluation: X's taproot = 1/2 X
Furthermore, the more rain X get, the taller X is
In fact, X that receives >2 average rainfall of usual reception is higher than the average height of X
(A) If two false chicory plants differ in height, then it is likely that the one with the shorter taproot has received less than twice the average rainfall of the species' usual habitat. => If 2 X differ in height, then it is likely that the X1 (shorter taproot) has received less than 2 average rainfall of X
=> These matter are not mentioned in the argument.
(B) If a false chicory plant has a longer-than average taproot, then it is likely to have received more than twice the average rainfall
of the species' usual habitat.=> If X's taproot is longer than X's average taproot, then it is likely to have received more than twice the average rainfall => This was stated in the argument. If you choose this choice as the correct answer. It's a trap. This answer is the reverse form of the argument.
(C) It is not possible for a false chicory plant to receive only the average amount of rainfall of the species' usual habitat and be of above
average height. => not mentioned
(D) If the plants in one group of false chicory are not taller than those in another group of false chicory, then the two groups must have
received the same amount of rainfall. => not mentioned
(E) If a false chicory plant receives greater than twice the average rainfall of the species' usual habitat, then it will have a longer taproot than
that of an average-sized false chicory plant. => If X receive >2 rainfall of the average X, then X will have longer than average (+ height of taproot = exactly 1/2 height of X) => the X'taproot will be higher than the average that of average X
=> Argument Evaluation: X's taproot = 1/2 X
Furthermore, the more rain X get, the taller X is
In fact, X that receives >2 average rainfall of usual reception is higher than the average height of X
(A) If two false chicory plants differ in height, then it is likely that the one with the shorter taproot has received less than twice the average rainfall of the species' usual habitat. => If 2 X differ in height, then it is likely that the X1 (shorter taproot) has received less than 2 average rainfall of X
=> These matter are not mentioned in the argument.
(B) If a false chicory plant has a longer-than average taproot, then it is likely to have received more than twice the average rainfall
of the species' usual habitat.=> If X's taproot is longer than X's average taproot, then it is likely to have received more than twice the average rainfall => This was stated in the argument. If you choose this choice as the correct answer. It's a trap. This answer is the reverse form of the argument.
(C) It is not possible for a false chicory plant to receive only the average amount of rainfall of the species' usual habitat and be of above
average height. => not mentioned
(D) If the plants in one group of false chicory are not taller than those in another group of false chicory, then the two groups must have
received the same amount of rainfall. => not mentioned
(E) If a false chicory plant receives greater than twice the average rainfall of the species' usual habitat, then it will have a longer taproot than
that of an average-sized false chicory plant. => If X receive >2 rainfall of the average X, then X will have longer than average (+ height of taproot = exactly 1/2 height of X) => the X'taproot will be higher than the average that of average X
02 Apr 2017, 20:37
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Let's take a look at option B...
We know that "False chicory's taproot is always one half as long as the plant is tall.", so if a false chicory plant has a longer-than average taproot, then it is also taller than average. We know that "false chicory plants that receive greater than twice the average rainfall of the species' usual habitat always reach above-average heights", BUT we do not know that the reverse is true; in other words, we do not know that false chicory plants that reach above-average heights always (or even mostly) receive greater than twice the average rainfall of the species' usual habitat.
If that is unclear, imagine there are 100 false chicory plants, and 30 of those plants receive greater than twice the average rainfall of the species' usual habitat. According to the statements in the passage, those 30 plants MUST reach above-average heights. But that same group of 100 plants might include 50 plants that reach above-average heights even though they do NOT receive greater than twice the average rainfall of the species' usual habitat. Thus, statement B is not necessarily true.
Quote:
(B) If a false chicory plant has a longer-than average taproot, then it is likely to have received more than twice the average rainfall of the species' usual habitat.
We know that "False chicory's taproot is always one half as long as the plant is tall.", so if a false chicory plant has a longer-than average taproot, then it is also taller than average. We know that "false chicory plants that receive greater than twice the average rainfall of the species' usual habitat always reach above-average heights", BUT we do not know that the reverse is true; in other words, we do not know that false chicory plants that reach above-average heights always (or even mostly) receive greater than twice the average rainfall of the species' usual habitat.
If that is unclear, imagine there are 100 false chicory plants, and 30 of those plants receive greater than twice the average rainfall of the species' usual habitat. According to the statements in the passage, those 30 plants MUST reach above-average heights. But that same group of 100 plants might include 50 plants that reach above-average heights even though they do NOT receive greater than twice the average rainfall of the species' usual habitat. Thus, statement B is not necessarily true.
