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kaplan rc funda doubt

by mundasingh123 » Thu Jul 14, 2011 11:22 am
hi ron , you have ,on many an occasion , emphasized the merit of relying on intuition while attempting an rc .
I came across a kaplan rc at
https://books.google.ca/books?id=3wDauhE ... &q&f=false
could you please help me nail down the problem with my "Reading approach"
while attempting q1 (in the screenshot attached along with this post )
i was having problems deciding between C and E
the option C takes me to the following lines in the 1st para
"The water temperature measures a uniform 38-42 degrees in late winter after any surface ice has melted . Wave action stirs the oxygen into the water at the lakes surface and ... "
cant i deduce from these 2 lines that its the melting of the surface ice that has helped the dissolved oxygen supply .
while attempting the OG Rc questions , i was able to combine information from 2 successive statements to make an inference . why didnt my approach work here .








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by VivianKerr » Fri Jul 15, 2011 8:15 am
Here is how I broke down this passage.

Topic: thermocline
Scope: how it affects lakes
1st P: to introduce thermocline & describe lake conditions mid-winter
2nd P: to describe changes in spring (warm water at top expands)
3rd P: to show what happens come summer (boundary = therocline)
4th P: to describe "turnover" in autumn
Author's POV: factual/scholarly throughout
Purpose: to describe the cycle in a lake & explain thermocline

Question Rephrase: What is likely TRUE about "dissolved oxygen"?

Let's review where in the passage oxygen is described for our prediction.

Prediction: In late winter, oxygen is dissolved to all depths (paragraph 1), in summer the barrier prevents mixing (paragraph 3, in autumn the oxygen goes downward in a current (paragraph 4).

IMO: E

There is nothing in the passage to support the idea that ice blocks the oxygen. All we are told in Paragraph 1 is that AFTER the ice has melted, waves churn oxygen back into the water. Also, the word "completely" is a red flag as it is an extreme word. Lines 7-10 almost completely paraphrase choice E.
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by mundasingh123 » Fri Jul 15, 2011 8:28 am
VivianKerr wrote:Here is how I broke down this passage.

Topic: thermocline
Scope: how it affects lakes
1st P: to introduce thermocline & describe lake conditions mid-winter
2nd P: to describe changes in spring (warm water at top expands)
3rd P: to show what happens come summer (boundary = therocline)
4th P: to describe "turnover" in autumn
Author's POV: factual/scholarly throughout
Purpose: to describe the cycle in a lake & explain thermocline

Question Rephrase: What is likely TRUE about "dissolved oxygen"?

Let's review where in the passage oxygen is described for our prediction.

Prediction: In late winter, oxygen is dissolved to all depths (paragraph 1), in summer the barrier prevents mixing (paragraph 3, in autumn the oxygen goes downward in a current (paragraph 4).

IMO: E

There is nothing in the passage to support the idea that ice blocks the oxygen. All we are told in Paragraph 1 is that AFTER the ice has melted, waves churn oxygen back into the water. Also, the word "completely" is a red flag as it is an extreme word. Lines 7-10 almost completely paraphrase choice E.
Hi Vivian thanks for the help .
But i do remember this method of combining ideas given in 2 sentences to arrive at Inferences in a lot of OG Questions . I didnt remember to note down exactly which questions . Is it just an illusion
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by VivianKerr » Fri Jul 15, 2011 10:10 am
IMO, not all inference questions are created equally, and may require different steps to solve, so I don't use a hard and fast rule for these. I've always used a Question Rephrase/Prediction method for RC regardless of the Q-type, so if this is a MGMAT strategy, maybe Ron can shed some light?
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by mundasingh123 » Fri Jul 15, 2011 10:22 am
Hi Vivian thanks for the help .
EDIT :But i found this method of combining ideas given in 2 sentences to arrive at Inferences helpful in a lot of OG Questions . I didnt remember to note down exactly which questions . Is it just an illusion
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by VivianKerr » Thu Jul 21, 2011 6:25 am
This is not a method I have ever used, so I can't speak to its accuracy or helpfulness. If you found it helpful then it may be useful somehow, but in this question it led you to eliminate an answer choice that perfectly paraphrased the passage, so I think you need to examine how you are selecting between the answer choices.

The question implies that only ONE of the following will be a reasonable inference. Even if you got it down to C and E, you should have asked: why can E be eliminated? Is E an UNREASONABLE inference? Since E is DIRECTLY supported by the passage, it is obviously NOT unreasonable.

When you select your choice, make sure you know the exact reason you are eliminating the other choices. Don't just find the answer you "think" is correct and stop there.
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