Question

in high concentrations, hydrogen sulfide (h2s) is typically toxic to many plants. frederick d. dooley and colleagues wanted to understand what effects low doses of h2s might have on plant growth. they treated bean, corn, wheat, and pea seeds with various concentrations (measured in micromoles per liter) of h2s and tracked the germination of those seeds along with the germination of untreated seeds. treatment with particular concentrations of h2s was associated with accelerated germination; for example,____ which choice most effectively uses data from the graph to complete the statement? choose 1 answer: at 168 hours, more than 90% of seeds treated with h2s 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 h2s at a concentration of 500 micromoles per liter had germinated, whereas only approximately 30% of untreated seeds had germinated. at 24 hours, less than 10% of seeds treated with h2s at a concentration of 10 micromoles per liter had germinated, whereas more than 90% of those seeds had germinated at 168 hours.

Explanation:

Step1: Analyze option A

Check the graph at 168 hours. For 10 or 500 micromoles per liter of H₂S - treated seeds, we can see that the germination rate is indeed more than 90%. For untreated seeds, the germination rate is less than 70% at 168 hours.

Step2: Analyze option B

At 48 hours, for 30 micromoles per liter of H₂S - treated seeds, the germination rate is not approximately 50% as per the graph.

Step3: Analyze option C

At 24 hours, for 10 micromoles per liter of H₂S - treated seeds, the germination rate is not less than 10% as per the graph.

Answer:

A. at 168 hours, more than 90% of seeds treated with H₂S at concentrations of 10 or 500 micromoles per liter had germinated, whereas less than 70% of untreated seeds had germinated.