Question

three girls won the top prize at a science fair. the girls studied the effects of treating barley seeds in different solutions before planting them. some of their findings are summarized below.

question 11
compared to control group seeds, the water + bacteria treated seeds produce dropdown and dropdown

Explanation:

Analyze germination time data

Using the Experimental Design knowledge point, we compare the germination times of the two groups from the first bar graph:

• Water treated (control group): approximately 5 days.
• Water + bacteria treated: approximately 2 days.

Thus, the bacteria-treated seeds germinated faster (took less time).

Analyze dry mass data

Using the Manipulated Variable knowledge point, we compare the dry mass after 37 days from the second bar graph:

• Water treated (control group): approximately \(0.35\text{ g}\).
• Water + bacteria treated: approximately \(0.65\text{ g}\).

Thus, the bacteria-treated plants grew larger (had more dry mass).

Formulate the final conclusion

Combining both observations, compared to control group seeds, the water + bacteria treated seeds produce plants that germinate faster (or in less time) and have a greater dry mass (or grow larger).

Answer:

Compared to control group seeds, the water + bacteria treated seeds produce <blank>plants that germinate in less time</blank> and <blank>have a greater dry mass</blank>