PrepTest 148

Incorrect. There's no indication of how many plant species have had their DNA already analyzed, so it's possible that most have yet to be done, making this answer possible.

Incorrect. While the stimulus notes making one is no easy task, it does seem as if having one would be helpful in preventing duplication and ensuring relationships. This answer is, if anything, supported by the stimulus.

Incorrect. The stimulus doesn't discuss any other fields, so it's possible that the problem highlighted isn't limited to botany.

Correct. Argument or Facts:
Facts

Question Type:
Cannot Be True

Stimulus Summary:
Making a central plant database is hard:

(1) Scientists have given the same plant different names

(2) Scientists have been grouping plants from different species wrongly into the same species, as DNA has shown

Answer Anticipation:
Cannot Be True questions require answers that contradict information from the stimulus. As such, stronger statements tend to lend themselves to correct answers. Here, however, we just get two issues that have come up with the way that plants have been studied over time. Since these statements more describe a situation than provide strong statements that can be contradicted, we should spend less time anticipating and more time analyzing the answers. And, similarly, let's focus on the stronger ones, as they're more likely to be contradicted.

Answer Explanation:
The extreme nature of this answer choice ("no techniques") means that if there's a single technique to allow for determining whether distinct species have distinct names, then this cannot be true and is correct. And since the stimulus notes that botanists have collected and named plants that were already named, there must be some way to tell which plant species have already been named or it would be impossible to know that there have been doubles. So there's at least one technique out there to accomplish this, and this answer is therefore not true.

Key Takeaway:
For Cannot Be True questions, extreme answers are more likely to be contradicted and thus correct. Focus on them when analyzing answer choices!

Incorrect. The stimulus notes that some plants have received multiple names, so someone looking up just one of them could miss information that's only in a separate entry.