Introducing the Scientific Method

This hands-on lesson provides a fun and interactive introduction to science that will resonate with young learners, helping them see how the scientific method can be applied in a tangible way. It encourages critical thinking, promotes curiosity, and offers a sense of accomplishment and ownership in the learning process.

Objective:

• Introduce students to the scientific method through discussion and hands-on experimentation using microgreens.
  
• Teach students the value and satisfaction of learning by engaging them in a real-world science project that is personal and connected to their future.
  
• Encourage critical thinking and inspire curiosity about science through interactive and visually rewarding experiments.
  

Grade Level:

• 5th to 8th grade
  

Materials Needed:

• Microgreen kits (with seeds such as pea, sunflower, or radish)
  
• 5×5 inch trays, or similar
  
• Coco coir discs potting soil
  
• Water
  
• Measuring cups
  
• Rulers
  
• Light source (natural sunlight or inexpensive LED lights)
  
• Scientific Journals or observation sheets (available at TheMightyMicrogreen.com)
  
• Markers or pens
  

Duration:

• 1-hour class with 15-minute daily follow-up sessions to track progress.
  

Lesson Outline:

1. Introduction to the Scientific Method (10 minutes)

• Discussion:
  Start by introducing the scientific method— The scientific method is a process used to investigate the world around us and answer questions using logical and systematic steps. It involves making observations, forming a hypothesis, designing and conducting experiments, analyzing data, and drawing conclusions. This method helps scientists (and anyone!) to solve problems and understand how things work in a reliable and objective way. 
• Explain the role of the scientific method in scientific discovery. Define each step in simple terms:
  
  • Ask a Question: What do we want to find out?
    
  • Do Background Research: What do we already know?
    
  • Construct a Hypothesis: What do we think will happen?
    
  • Test with an Experiment: How will we test our hypothesis?
    
  • Analyze Data: What did we learn from our experiment?
    
  • Communicate Results: How can we share what we found?

Teachers Note: the steps of the scientific method are not always performed in the same order. While the scientific method provides a general framework for investigation, it is not a rigid, linear process. Scientists often revisit previous steps or adapt the order based on new findings or the specific nature of their research.

• Interactive Example using microgreens:
  Ask the students a simple question like, “What do you think happens if we grow microgreens with different amounts of light?” Introduce the concept of testing variables (light, water, soil, etc.).
  

2. Setting Up the Microgreen Experiment (15 minutes)

• Hands-On Activity:
• Explain variables and controls (1) if needed
  Have students set up their microgreens by following these steps:
  • Design Variables: the independent, the dependant, and the controlled. Guide the students in deciding what to test by asking what plants need to survive and grow (light, water, air, and temperature). Additional variables for microgreens might be with or without a cover and/or weight. Choose one variable to test for each student or group of students, or variations of the same variable for the entire class. Each variable will require at least two trays- one to test the variable, one as a control.
    
  • Plant the Trays: In groups or individually, students plant their chosen microgreen seeds according to directions. Use measuring cups tp assure that each coir disc is rehydrated with the same amount of water.
    
  • Hypothesis Formation: Ask students to predict what they think will happen based on the variables they chose. Have them record their experiment, including all variables and their hypothesis, in their scientific journals
    
  • Draw or describe their setup.
    

3. Observation and Data Collection (20 minutes)

• Daily Observation:
  Explain that they will track the growth of their microgreens over the next 10 days. Encourage students to examine their experiment carefully including:
  
  • Changes in plant height.
  • Cotyledon or leaf color and size.
  • Any difference in germination patterns
  • Any other differences observed in the two trays.
    
• Recording Results:
  Ask the students to record their observations carefully. Have them measure the plants’ growth using rulers and document these measurements. They should also take notes on environmental factors (how much light, the temperature, etc.).
  
• Discussion:
  Each day, ask them to predict what might happen in the next few days. What changes do they expect to see? This encourages critical thinking and makes the process more engaging.
  

4. Group Reflection and Analysis (10 minutes)

• Class Discussion:
  After a 7-10 days of observations, bring the students together to analyze their results based on their experiment and observations . Did the data match their hypothoses?,
  
• Analysis Questions:
  
  • What patterns did they notice in the growth of the plants? How did the variables affect the growth and results?
    
  • Were there any surprises? What might have caused them?
    
  • Did their experiment test what they set out to test?
    
• Revising Hypotheses:
  Encourage students to refine their hypotheses based on the data they’ve gathered. What would they do differently next time to test other variables or improve their experiment?
  

5. Wrap-Up and Encouragement to Continue Learning (5 minutes)

• Reflect on Learning:
  Talk to students about the satisfaction of discovering things for themselves. Emphasize that science is about curiosity and trying things out, even when the results are unexpected.
  
• Closing Questions:
  Ask them to think about how this process can be used in everyday life. For example:
  
  • How can the scientific method be used to solve problems at home or in the community?
    
  • How might they use this method in other areas of life, like cooking, planning for the future, or making decisions?
    
• Next Steps:
  Encourage students to continue observing their microgreens at home, asking them to track growth and continue testing new ideas. Offer to provide extra seeds for them to experiment further if they wish.
  

Learning Outcomes:

By the end of this lesson, students will:

• Understand the scientific method and its importance in everyday life.
  
• Have experienced firsthand how experimentation works, giving them confidence to engage in future experiments.
  
• Be inspired to explore further scientific inquiry, both inside and outside the classroom.
  
• Learn the value of observation, careful data collection,  hypothesis testing, and considering results through a real-world project involving microgreens.
  

1. Variables

Variables

Variables are the things that can change or be changed in an experiment. 

• Independent variable: This is the one thing that you change to see what happens.
  • Example: In a microgreen project, the independent variable could be the amount of light the seeds receive (e.g., placing one set in a sunny window, another under a grow light, and one in a darker spot).
• Dependent variable: This is what you observe and measure to see if it changes because of your independent variable.
  • Example: In the same microgreen project, the dependent variable could be the height of the microgreens after a week or how many leaves they have.
• Controlled variables (or constants): These are all the things you need to keep exactly the same for all your microgreen groups so that you know for sure that any changes you see are only because of your independent variable.
  • Examples: In a microgreen experiment, controlled variables include:
    • Type of seeds (e.g., using all speckled pea seeds)
    • Amount of seeds planted in each container is exactly the same
    • Type of growing medium (e.g., using the same potting soil rehydrated with exactly the same amount of water for all containers)
    • Amount of water given to each container is exactly the same and given at the same time each day
    • Temperature of the room
    • Container size and type 
    • Control group

A control group is important in an experiment because it gives you something to compare your results to. 

• Example: If you’re testing the effect of different amounts of light on microgreen growth, your control group could be microgreens grown under an LED or grow light. You would then compare the growth of microgreens in darker spots or in a windowsill to this control group. 

Remember to

• Carefully record observations and measurements in a journal.
• Take pictures of the microgreens at different stages.
• Analyze the data and draw conclusions about whether the hypothesis was correct.