Reading comp PrepTest 156 · Section 1 · Question 6

Passage

 Because most agricultural practices in North America produce row after row of only a few, genetically identical, varieties of crops, Remaining source text redacted.
Passage walkthrough
Passage Summary

Topic:
Science/Social Science

Paragraph 1
  • Paragraph note
    • Problem/Solution and Old Approach/New Approach
  • Views, minor Meta-Structures, and the author's attitude
    • Problem: North American agri practices are eroding the genetic base of crops, making them less durable (pests/disease)
    • Solution/New Approach: Look into indigenous farmers (practices, heirloom varieties of crops)
    • Old Approach: Focus on agricultural methods brought to North America from elsewhere


Paragraph 2

  • Paragraph note
    • Study/Examples of better practices by indigenous farmers
  • Views, minor Meta-Structures, and the author's attitude
    • Study: Indigenous farmers used genetics to make varieties
    • Example: Hybridization — Lots of varieties of (list of crops) that resisted disease/pests
    • Example: Make crops for local environments, less dependent on irrigation


Paragraph 3

  • Paragraph note
    • Process of maintenance; new wrinkle on problem
  • Views, minor Meta-Structures, and the author's attitude
    • Process: Regional exchange networks for seeds; oral tradition for methods
    • Problem: World market economy leading to these practices and varieties being lost, so need to protect ASAP


Main Point:

Because mass farming practices have harmed crop durability, it's important to turn to indigenous farmers' practices to protect the genetic base of crops, especially as the world market is starting to cause these practices to be lost.

Key Lines (P(aragraph)#, S(entence)#)?

P1, S1 - The problem
P1, S2 - One solution
P1, S3 - The Old and New Approaches
P2, S2 - An example is introduced
P2, S4 - Another example
P3, S1 - Processes by which the solution has worked
P3, S2 - A new wrinkle to the problem
Meta-Structure?



Problem/Solution: The opening sentence here introduces what is clearly a problem: the increasing susceptibility of food crops to pests and disease due to current agricultural processes. From this, we should expect the author to bring up a solution, or a variety of solutions. The author does so explicitly in the second sentence — looking to the "store of agricultural knowledge" held by indigenous farmers and the heirloom crops they work with. While the author calls this only a "possible" solution, the rest of the passage describes why this knowledge and these crop varieties can solve the problem, which suggests the author has at least some faith in the solution. In a Problem/Solution passage where the author supports a particular solution, the solution is the main point, reflected in our summary above.

Old Approach/New Approach: In Paragraph 1, Sentence 3, the author brings up Old and New Approaches used by crop geneticists to preserve the genetic base of crops. The Old Approach focused on studying "solely" agricultural methods brought to North America from elsewhere. These approaches aren't mentioned again. The New Approach is to study the methods and varieties of crops produced by indigenous farmers, which is the solution/main point. So this Meta-Structure informs the main point, but it isn't the central Meta-Structure that defines the passage. Expect a question or two on this Meta-Structure, but we shouldn't eliminate main point answer choices simply because they don't reference the old approach.

Last Thoughts?

This is a fairly straightforward passage as far as information, structure, and Meta-Structures are concerned, so let's head to the questions!

Question prompt

According to the passage, Remaining source text redacted.
Why the credited answer is right

Credited answer: E

The notes below walk through why it fits the stem and how to eliminate the rest.

Question Type

Science

Answer choices

  1. A
    North American farmers now Remaining source text redacted.
    Why choice A is not credited
    (P1, S1; P3, S3) This answer choice is too strong. While "most" North American agricultural practices focus on non-heirloom crops and a "dwindling number" of small farmers are maintaining those crops, it's not the case that commercial crops are the only ones ("exclusively") used on the continent.
  2. B
    The loss of crop Remaining source text redacted.
    Why choice B is not credited
    (P1, S1; P2, S3) This answer choice mixes up commercial and heirloom crop varieties. Commercial varieties have seen an erosion of genetic diversity leading to pests and diseases doing a lot of damage. Heirloom crops have maintained their resistance to pests and disease.
  3. C
    Agricultural researchers have not Remaining source text redacted.
    Why choice C is not credited
    (P1, S2-3) The passage states that agricultural researchers are looking at heirloom crops as a possible solution to the erosion of the genetic base of North American crops. While it does say that they focused their prior efforts on the methods brought to North America from elsewhere, it doesn't say that they overlooked indigenous methods (including heirloom crops) because those methods produced lower yields.
  4. D
    Heirloom crop varieties have Remaining source text redacted.
    Why choice D is not credited
    (P3, S3) The author identifies the adoption of large-scale, commercial farming methods by indigenous and small farmers as a cause of the dwindling stock of heirloom crop varieties. But the author never this adoption occured because it's difficult to adapt these varieties to large-scale processes. It doesn't seem as if anyone has tried until recently!
  5. E
    There are fewer farmers Remaining source text redacted.
    Why choice E matches the stem

    Question Type:
    Must Be True

    Strategy Overview:
    Find where the passage discusses the dwindling stock of heirloom crop varieties, identify a cause, and then find an answer restating it

    Answer Anticipation/Relevant Lines:
    For these questions that ask us to identify a specific piece of information, quickly finding that piece of information is paramount. To that end, we need to consider the passage's structure and how the topic in question would fit into that structure.

    Here, the question asks about the cause of the dwindling stock of heirloom crop varieties. Where might that show up in the passage? Those crop varieties are introduced as a possible solution to a problem in Paragraph 1, and how indigenous farmers have grown and maintained them is described in Paragraph 2. Paragraph 3 describes a wrinkle to the problem is described. A dwindling supply of the solution to the problem would undoubtedly be a wrinkle to that problem. So the cause of the dwindling supply of heirloom crops is probably in the third paragraph. Let's look there.

    Diving into Paragraph 3, we see that S2 and S3 give us our answer. The "penetration of the world market economy" has resulted in a "dwindling number of small farmers" focusing on these heirloom crops, shifting to commercial seed varieties. The answer should reflect these causes, so let's head to the answers.

    Answer Choice Explanation:
    (P3, S3) The author states that the "dwindling number of small farmers" planting heirloom, non-commercial seed varieties (because of the penetration of the world market economy into farming communities) has led to a dwindling of this stock, disrupting community and regional exchange networks. So this answer choice is correct.

    Key Takeaway:
    For questions asking about specific details in the passage, always use your big-picture notes on the role of each paragraph to identify where that information is likely to show up, narrowing down your search for it. It's the surest way to get to the correct answer quickly!

What this tests

Question analytics

Based on historical answer selection rates for this question.

Answer choice distribution

  1. A 17%
  2. B 5%
  3. C 8%
  4. D 22%
  5. E Credited 47%

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