53 RC Passage 4
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For questions 23, is A saying that the treated plot only has Cyclamen mites like the passage? I was mislead since it says both treated and untreated plots contain both Typh and cycla while the passage only one of the group has the predator.
(A) says that in plots where you have both T and C mites, whether you treated them with pesticide X or not, the C mites would have been kept in check.
This is undoubtedly true, as the passage tells us (line 39) that T is effective in checking C, partly because of their reproductive synchronicity (see paragraph 2).
The second paragraph tells us that Typhlodromus synchronizes its population to its prey's; thus, if Cyclamen slowed their reproductive rates, Typholodromus would as well, thereby keeping their rates in sync!
For #25 I narrowed it down to B and D. I ended up picking B because passage said C reproduces over 4-5 days and T reproduces over 8-10 days so I picked B because of those numbers. Would you be able to explain why B is wrong?
Thanks in advance...
I have two problems with (B): what I'll call a minor problem and a major problem.
The minor problem is that the passage doesn't give us enough information to suggest that (B) is true. Just because T mites have a longer cycle doesn't mean that predatory mites as a group typically have longer cycles.
The major problem (and I want you to consider it the larger problem because it has the most use to you in avoiding errors on future questions) is that even if (B) were true, it still wouldn't be the correct answer. Here, we've been asked what the purpose of mentioning the cycle rate was. The author brought that to our attention to illustrate the point she's making in line 16. Why does she think that T can increase its pop. as quickly as its prey? Because Cyclamen lay eggs . . . blah blah blah . . . and T. lays eggs . . . yadda yadda yadda. Here, as is nearly always the case, the author introduces facts in order to support her conclusion, not in order for us to know those facts.