Question 100-90
In high concentrations, hydrogen sulfide (H�S) is typically toxic to many animals. Frederick D. Dooley and colleagues wanted to understand what effects low doses of H�S might have on animal growth. They treated bean, corn, wheat, and pea seeds with various concentrations (measured in micromoles per liter) of H�S and tracked the germination of those seeds along with the germination of untreated seeds. Treatment with particular concentrations of H�S was associated with accelerated germination: for example, blank
Which choice most effectively uses data from the graph to complete the statement?
at 24 hours, less than 10% of seeds treated with H�S at a concentration of 10 micromoles per liter had germinated, whereas more than 90% of those seeds had germinated at 168 hours.
at 48 hours, more than 70% of seeds treated with H�S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 50% of untreated seeds had germinated.
at 168 hours, more than 90% of seeds treated with H�S at concentrations of 10 or 500 micromoles per liter had germinated, whereas less than 70% of untreated seeds had germinated.
at 48 hours, approximately 50% of seeds treated with H�S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 30% of untreated seeds had germinated.
100 90 80 70 60 50 40 30 20 10 0 Seeds germinated (%) 24 48
Hard-difficulty · SAT Reading & Writing · Command of Evidence — Quantitative evidence: reading tables and graphs. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice B is the best answer. The claim is that some concentrations of H�S led to increased germination rates, and this choice accurately shows that seeds treated with 10 micromoles per liter of H�S tended to germinate faster than untreated seeds.
Choice A is incorrect. This choice doesn’t justify the claim. The claim compares the germination rates of seeds exposed to certain concentrations of H�S to untreated seeds, but this choice only discusses one concentration of H�S, so it can’t support any comparison between treated and untreated groups. Choice C is incorrect. This choice misreads the graph. At 168 hours, only about 85% of seeds treated with H�S at 500 micromoles per liter and well over 70% of untreated seeds had germinated (about 80%). Choice D is incorrect. This choice misreads the graph. At 48 hours, about 70% of seeds treated with H�S at 10 micromoles per liter and about 50% of untreated seeds had germinated.
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