Logical ReasoningDifficulty: Easy

PT143 S3 Q23 Explanation

Amateur gardeners who plant based

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

TopicsNecessary Assumption

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Stimulus

Amateur gardeners who plant based on the phases of the moon tend to get better results than those who do not. This seems surprising since the phases of the moon do not affect how plants grow. An alternative practice often found among amateur gardeners is to plant during the first warm spell of the moon are less likely to lose plants to a frost.

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.

The argument requires assuming which one of

Answer choices

  1. Correct82% picked this

    Using the phases of the moon usually leads amateur gardeners to plant later in the spring than those planting

    Why this is right

    This essentially point out the fact that the author is Assuming a Difference when it comes to planting times. If we negate this, it would be saying that "using the phases of the moon usually leads gardeners to plant at least as early as those who plant at the first warm spell". That would indeed weaken, because it would make the moon-phase gardeners seem at least as vulnerable to losing plants to a frost. We were told that people planting at the first warm spell of spring are often jumping the gun. They're hoping it's warm enough to start planting, but if they over-eagerly plant and then a frost follows, they presumably lose some of those plants they recently planted to that frost. In order to not lose plants to a frost, it seems like you wouldn't want to plant until all the frosts are done for the year. So if the author thinks "moon phase" gardeners are less likely to lose plants to frost, he must be thinking that they wait to plant until later in the season, when it's less likely than any more frosts will occur.

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

  2. Unsupported Causal Relationship12% picked this

    The phases of the moon affect whether a frost follows the first warm

    The author thinks that moon-phase gardeners are less likely to lose plants to frost, but nothing in the argument suggested that the phases of the moon have a causal effect on when frosts occur on Earth. That's a pretty outlandish concept. (Phases of the moon are just caused by where the Moon and Earth and Sun are in relation to each other. When the moon is in its crescent phase, it's because a larger shadow from Earth is being cast on the Moon. That doesn't have any causal effect on Earth.)

  3. Out of Scope: different types3% picked this

    Amateur gardeners who use the phases of the moon tend to plant different types of plants than

    The author doesn't say anything to suggest that moon-phase gardeners use different types of plants. Sure, that could account for why they're less likely to lose plants (maybe the plants they tend to use are more frost-resistant). But that's not necessary to account for why they're less likely to lose plants. Even if the moon-phase gardeners plant the same types of plants as "first warm spell" gardeners, the former could still be less likely to lose plants to a frost (for example, by planting later in the season / by having better soil / by having better equipment / better irrigation / who knows). Admittedly, the correct answer is a little bit speculative. The argument doesn't clearly imply that the reason why moon-phase gardeners fare better with frost is related to when they plant. But it's more implied than any other reason. The author establishes that "first warm spell" gardeners plant during the first warm spell and thus lose plants if a frost follows. Because the author builds off that idea with So, we can tell her argument is connected more to the timing of planting.

  4. Too Strong: cannot unless2% picked this

    Amateur gardeners cannot improve their results unless they understand why their methods work

    There's nothing in this argument that commits the author to this extreme claim, that it's impossible for amateur gardeners to get better results unless they understand why their methods work. Really? It's impossible for an amateur gardener to just have dumb luck and improve their results, despite not fully understanding how their methods work? The author never ruled out that very reasonable possibility.

  5. Too Strong1% picked this

    Professional gardeners only rarely plant at the first warm spell

    Too Strong: only rarely Out of Scope: professional We know nothing about professional gardeners. We said nothing about them. The author has assumed nothing about them, certainly not a very extreme claim like "only rarely".

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