Logical ReasoningDifficulty: Hard

PT150 S3 Q17 Explanation

Since mosquito larvae are aquatic

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

TopicsParadox

Keep going in LSAT Lab

  • Save & drill this skill build targeted practice sets from questions like this one

  • Video walkthroughs watch every question solved step by step

  • 81 official LSATs as questions, timed sections & full-length tests

Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

Since mosquito larvae are aquatic, outbreaks of mosquito- borne diseases typically increase after extended periods of wet weather. An exception to this generalization, however, occurs in areas where mosquitoes breed primarily in wetland habitats. diseases are worse after periods of drought.

What this question is testing

Paradox

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

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

The question
17.

Which one of the following, if true, most helps to resolve the apparent

Answer choices

  1. Unrelated to Drought6% picked this

    The use of insecticides is typically prohibited in

    If you can't use pesticides in a wetland habitat, then you would potentially end up with more mosquitoes in a wetland habitat. But insecticides have no connection to drought, and we need a way to explain why there's an explosion of mosquitoes after a drought, rather than after wet weather.

  2. Unrelated to Drought3% picked this

    Human populations tend to be sparse in areas near

    If you don't have humans near a wetland habitat, is that a good thing or a bad thing for mosquito populations? The fact that I'm not sure should warn us that there's no common sense knowledge to use here. Obviously mosquitoes bite humans, but does the presence of human populations make it more or less likely that local mosquitoes would thrive? More importantly, human populations have no connection to drought, and we need a way to explain why there's an explosion of mosquitoes after a drought, rather than after wet weather.

  3. Correct71% picked this

    Wetland habitats contain numerous aquatic insects that prey on

    Why this is right

    Since mosquito larvae (babies) are aquatic, they hatch in water. If they live in a wetland habitat, where there are aquatic predators, then the predators eat a lot of the larvae and reduce the overall mosquito population. During a drought, though, water dries up, and so the populations of aquatic insects would go down. If the population of mosquito larvae's predators is lower, than more mosquito babies will grow up, spread their wings, and get out in there in the real world to spread some diseases.

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

  4. Unrelated to Drought11% picked this

    Wetland habitats host a wider variety of mosquito species than do other areas

    A wider variety of mosquito species has no connection to drought, so it doesn't give us a way to explain how drought makes the mosquito population increase.

  5. Unclear Impact10% picked this

    Periods of drought in wetland habitats create conditions conducive to the emergence of

    This answer has a direct tie-in to drought. When there's a drought, there will be more plants growing. But do we have a common sense way to get from "more plants growing" to "more mosquitoes / more disease outbreaks"? No. In the correct answer, we had "when there's a drought, it will negatively impact aquatic insects that prey on mosquito larvae". There, we have a common sense way to get from impact of a drought (mosquito predators disappear) to the idea of "more mosquitoes / more disease outbreaks".

Continue the review in LSAT Lab

Save this question, watch the video walkthrough, and drill similar questions in your LSAT Lab account.

LSAT Lab

Turn this review into a targeted study plan.

Save this question, drill more like it, watch the video walkthrough, and track your progress in your LSAT Lab account.

Start practicing free