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Salinity & Mung Beans. Designing a Controlled Experiment. The Scenario.

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salinity mung beans

Salinity & Mung Beans

Designing a Controlled Experiment

the scenario
The Scenario

Farmers in the central valley of California have become increasingly concerned about the build-up of salt in the soil and water. Farmers know that small amounts of salt in the soil and water will not adversely affect the germination and growth of their crops. But as the salt concentration increases, negative impacts occur. Eventually salt concentration may become so great that seeds will no longer germinate.

your job
Your Job

These farmers want your “company” to do the research and present them with a report that show how increasing salt concentrations will affect the germination of their seed crops. They need to know the relationship between salt concentration and the percent of seeds germinating as well as the average growth.

the requirements
The Requirements
  • Your lab report must be typed and turned into me to me by Friday, Sept. 9. It will follow the format (slides to follows). Failure to do so will result in a deduction of points.
  • The experiment will run for 11 days with 5 days to type out and submit. This is a group experiment (you will share data, tables, charts, observations) but the lab report is INDIVIDUAL.
the relationship between salt concentration and the germination of mung bean seeds

The Relationship Between Salt Concentration and the Germination of Mung Bean Seeds

By Happy Feet

Period 2

Other group members include:

Sad Feet

Happy Arms

Pretty Eyes

lab report format for this class
Lab Report Format for this Class
  • State the purpose: “At what percent concentration of salt will mung beans stop germinating? What is the relationship between salt concentration and percent of germination?”
  • State the hypothesis
  • Perform the experiment
    • Materials
    • Procedure
    • Controls & Variables
      • Describe the control group
      • Describe the experimental group
      • Identify the controlled variables of the experiment.
      • Identify the independent variable
      • Identify the dependent variable

Lab Report Format for this Class

  • Organize the Data
    • Recorded Data – table I initialed
    • Processed Data - none
    • Graphs, tables, and charts – bar graph
v conclusion continued do not write the questions write in complete sentences
V. Conclusion (continued)…Do not write the questions. Write in complete sentences.
  • Restate the problem that you were solving.
  • State your results.
  • What do your results mean? What is the relationship between salt concentration and the percent of seeds germinating?
  • Did you solve the problem or answer the question? Explain.
  • What was your hypothesis?
  • Was your hypothesis correct? Why or why not? Refer to your experiment and/or data.
v conclusion continued do not write the questions write in complete sentences1
V. Conclusion (continued)…Do not write the questions. Write in complete sentences.

G. Complete the following:

  • “Before this lab, I never knew…”
  • “As a result of this lab, I learned…”
  • “Because of this lab, I would like to learn more about…”

H. Reflection.

  • What did you think of the lab or activity?
  • What did you enjoy the most?
  • The least enjoyable (do not say… “writing this report”. I want actual thought and reason)

I. If you had to do the lab or activity again, how would you improve it? “Nothing” is unacceptable. There is always room for change with everything we do in life.

other information
Other information…
  • You will have 1 control group (if it dies you get no higher than a D grade) 4 cups for the experimental group.
  • In the materials section of your lab report, you will list the materials in a table, bullet style
  • You will pre-mix all salt solutions and store in water bottles
  • Remember the activity “Can it be replicated?” Write detailed and precise procedures (use Step 1, Step 2).
other information continued
Other information…(continued)
  • I must initial your table/chart each day measurements and observations are taken.
  • You will have to scan the original data table/chart that has my initials and put it into your report.
  • You will include pictures. Ok to use cell phone
  • Your data will be placed into a graph. If you do your graph on graphing paper, it must be scanned and put it into your report.
  • I must see the table/chart you will use to collect your data before you begin the experiment. The table/chart must includes labels and titles
other information continued1
Other information…(continued)
  • Show me your list of materials needed. I will tell you what I have and what you need to bring it.
  • We start this Wednesday/Thursday.