Mashaal Masha
Mashaal Masha
 Apr 21, 2024
0
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, ____________

Which choice most effectively uses data from the graph to complete the statement?

 

Difficulty: Medium
A: 

at 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.

B: 

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.

C: 

at 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.

D: 

at 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.

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