English Language · English
Which choice most effectively uses data from the graph to complete the statement? In high concentrations, hydrogen sulfide (H 2 S) is typically toxic to many plants. Frederick D. Dooley and colleagues wanted to understand what effects low doses of H 2 S might have on plant growth. They treated bean, corn, wheat, and pea seeds with various concentrations (measured in micromoles per liter) of H 2 S and tracked the germination of those seeds along with the germination of untreated seeds. Treatment with particular concentrations of H 2 S was associated with accelerated germination: for example, ______.
- 1at 48 hours, more than 70% of seeds treated with H 2 S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 50% of untreated seeds had germinated.✓
- 2at 168 hours, more than 90% of seeds treated with H 2 S at concentrations of 10 or 500 micromoles per liter had germinated, whereas less than 70% of untreated seeds had germinated.
- 3at 48 hours, approximately 50% of seeds treated with H 2 S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 30% of untreated seeds had germinated.
- 4at 24 hours, less than 10% of seeds treated with H 2 S at a concentration of 10 micromoles per liter had germinated, whereas more than 90% of those seeds had germinated at 168 hours.
Correct answer
at 48 hours, more than 70% of seeds treated with H 2 S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 50% of untreated seeds had germinated.
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