The hypothesis is that the lettuce seeds will respond in a predictable manner to varying concentrations of salt.

You will treat the lettuce seeds in a bleach solution, label a series of beakers with different concentrations of salt, add the appropriate test solution to each petri dish, add 5 lettuce seeds to each dish, place the dishes in a plastic bag, incubate the seeds in the dark for 5 days, and then count how many seeds have germinated and measure the root length of each.

You will need lettuce seeds, deionized or distilled water, a 0.2M NaCl solution, 9-cm petri dishes, 7.5-cm paper filter, bleach, and a plastic bag.

After conducting the experiment, we can conclude that the lettuce seeds responded in a predictable manner to varying concentrations of salt. The most interesting observation was that at some threshold concentration, all of the test organisms were killed.

This science project is interesting because it demonstrates how a simple organism can be used to test the toxicity of a compound.

Experiment variations to consider include testing different compounds and using different concentrations of the same compound.

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!