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, ______

Question

Which choice most effectively uses data from the graph to complete the statement?
Choose 1 answer:
Choose 1 answer:
(Choice 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.
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.
(Choice B) at 48 hours, approximately 50% of seeds treated with H2S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 30% of untreated seeds had germinated.
B
at 48 hours, approximately 50% of seeds treated with H2S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 30% of untreated seeds had germinated.
(Choice C) 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.
C
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.
(Choice D) at 48 hours, more than 70% of seeds treated with H2S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 50% of untreated seeds had germinated.
D
at 48 hours, more than 70% of seeds treated with H2S at a concentration of 10 micromoles per liter had germinated, whereas only approximately 50% of untreated seeds had germinated.

which is the true correct answer a b c or d

Answer 1

To determine which choice most effectively completes the statement about the effects of low doses of H2S on plant germination, we should consider the details provided in each option and how they relate to the observed data.

Based on the options:

Choice A mentions that at 168 hours, more than 90% of seeds treated with H2S (at 10 or 500 micromoles per liter) had germinated, compared to less than 70% for untreated seeds. This suggests a significant impact at a later time point.

Choice B states that at 48 hours, approximately 50% of seeds treated with H2S at 10 micromoles per liter had germinated, compared to about 30% of untreated seeds. This shows an early positive effect of H2S treatment.

Choice C discusses germination at 24 hours, indicating less than 10% germination for H2S treated seeds but more than 90% by 168 hours. This shows a significant improvement over time but does not provide a direct comparison at the 24-hour point that supports the statement.

Choice D mentions that at 48 hours, more than 70% of seeds treated with H2S at 10 micromoles per liter had germinated, which is inaccurate as it states that it is higher than 50% for untreated seeds.

To best reflect that low doses of H2S may have a beneficial effect on germination compared to untreated seeds, Choice B is the most effective statement. It illustrates that even at an early time point (48 hours), H2S treatment led to a higher percentage of germination compared to untreated seeds, indicating a positive effect.

Thus, the correct answer is:

Choice B.