Logical ReasoningDifficulty: Easy

PT124 S1 Q23 Explanation

Robust crops not only withstand

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsNecessary Assumption

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Stimulus

Robust crops not only withstand insect attacks more successfully than other crops, they are also less likely to be attacked in the first place, since insects tend to feed on weaker plants. Killing insects with pesticides does not address the underlying problem of inherent vulnerability to damage caused by insect attacks. Thus, those crops in good soil—soil with adequate nutrients, organic matter, and microbial activity.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
23.

Which one of the following is an assumption on which the

Answer choices

  1. Too Strong2% picked this

    The application of nutrients and organic matter to farmland improves the

    An adequate microbial level could reached by some other means. This relationship describes how a set of conditions are achieved that describe good soil. However, the argument does not rely on determining how those conditions are achieved, but whether those conditions achieve a specific result—robust crops.

  2. Too Strong9% picked this

    Insects never attack crops grown in soil containing adequate nutrients, organic matter,

    The argument is relative in nature and does not go so far as assuming that insects never attack crops grown in good soil.

  3. Weakens6% picked this

    The application of pesticides to weak crops fails to reduce the extent to which they are

    Pesticides do kill insect pests. So pesticides do limit the damage caused by insect pests.

  4. Correct82% picked this

    Crops that are grown in good soil tend to be more robust

    Why this is right

    This bridges the gap between good soil and robust crops.

    Skill tested: Necessary Assumption · how this choice captures the argument's function is the move to repeat next time.

  5. Weakens2% picked this

    Growing crops without the use of pesticides generally produces less robust plants than when

    This undermines the assertion that growing crops in good soil is a better way to mitigate damage from insect pests than using pesticides.

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