Question

Line graph titled Seed Germination with and without H₂S Treatment. The horizontal axis is labeled Time, in hours. Its values are 24, 48, 72, and 168. The vertical axis is labeled Seeds germinated, in percent. It ranges from 0 to 100 in increments of 10. 3 lines are shown. All values are approximate.

The following 3 lines are shown:

- 500 micromoles per liter
- 10 micromoles per liter
- untreated

The 500 micromoles per liter line:

- Begins at 24 hours, 5%
- Rises sharply to 48 hours, 30%
- Rises sharply to 72 hours, 85%
- Remains level to 168 hours, 85%

The 10 micromoles per liter line:

- Begins at 24 hours, 7%
- Rises sharply to 48 hours, 73%
- Rises sharply to 72 hours, 90%
- Rises gradually to 168 hours, 97%

The untreated line:

- Begins at 24 hours, 0%
- Rises sharply to 48 hours, 50%
- Rises sharply to 72 hours, 73%
- Rises gradually to 168 hours, 80%\[\small{10}\]
\[\small{20}\]
\[\small{30}\]
\[\small{40}\]
\[\small{50}\]
\[\small{60}\]
\[\small{70}\]
\[\small{80}\]
\[\small{90}\]
\[\small{100}\]
\[24\]
\[48\]
\[72\]
\[168\]
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:
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.

Answer 1

The best choice to complete the statement based on the data provided from the graph is:

**(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.

This choice effectively highlights the effect of both concentrations of H2S treatment (10 and 500 micromoles per liter) on seed germination after a longer duration (168 hours) compared to untreated seeds.

The other options do not accurately summarize the data as effectively based on the germination percentages presented on the graph.