Identify Your Variables!
Design and run a simple experiment changing one variable like light or water, measure results, and record observations to identify variables.
Step-by-step guide to Identify Your Variables!
Step 1
Pick one variable to test for your experiment for example water amount or light exposure.
Step 2
Write a clear test question in your notebook that asks how that variable might change the plant.
Step 3
Write a simple hypothesis that predicts what will happen to the plant because of the change.
Step 4
List the independent variable the dependent variable and at least three things you will keep the same as controlled variables.
Step 5
Label two or more identical pots with letters or numbers using the marker so you can tell them apart.
Step 6
Put the same amount of soil into each pot using the measuring spoon or cup.
Step 7
Plant one seed at the same depth in each pot and gently cover it with soil.
Step 8
Set up the test by changing only the chosen variable for each pot for example if testing water give pot A one teaspoon and pot B three teaspoons each watering or if testing light place pot A on a sunny windowsill and pot B in a shaded spot.
Step 9
Record the date and the starting measurement in your notebook such as seed depth or seedling height if already sprouted.
Step 10
Follow the same care routine at the same time every day for 7 to 14 days while only changing the variable you picked.
Step 11
Each day measure the plant height with the ruler and write simple observations in your notebook such as number of leaves color and how healthy it looks.
Step 12
Make a simple table or draw a line graph of your daily measurements in your notebook so you can see changes over time.
Step 13
Look at your table or graph and write one sentence that explains which variable changed the plant and whether your hypothesis was supported.
Step 14
Share your finished experiment and what you learned on DIY.org
Final steps
You're almost there! Complete all the steps, bring your creation to life, post it, and conquer the challenge!
Help!?
What can we use if we don't have identical small pots, a measuring spoon, or a marker?
Use clean yogurt cups or empty food containers as identical pots, measure soil with a regular tablespoon or a 1/4 cup instead of the measuring spoon, and label each pot with masking tape and a pen if you don't have a marker.
My seeds aren't sprouting or the plants look different—what common mistakes should I check?
Make sure you planted each seed at the same depth and put the same amount of soil in each pot, followed the exact water or light setup you chose, and kept the same care routine and timing so only the chosen variable changed.
How can I simplify or make this experiment harder for different ages?
For younger kids, test just two pots with pre-measured soil and help record seedling height and simple observations each day, while older kids can test more variable levels, extend to 14 days, and draw a detailed table or line graph from their measurements.
What are some ways to extend or personalize the experiment after the initial 7–14 days?
Try more levels of your chosen variable (for example 1, 3, and 5 teaspoons of water), take daily photos to paste in your notebook and make a time-lapse, count leaves as an extra measurement to graph, and share your final results on DIY.org.
Watch videos on how to Identify Your Variables!
"What Are Variables? | Easy Coding for Kids!"
4 Videos
"What Are Variables? | Easy Coding for Kids!"
Python - Variables - W3Schools.com
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Facts about the scientific method
🔬 Controlled experiments usually change only one variable at a time so scientists can see what causes the effect.
📊 Putting measurements into tables and graphs makes patterns and trends much easier to spot.
🌱 Some plants can start bending toward light in just a few hours thanks to a response called phototropism.
🧪 The word “experiment” comes from the Latin experimentum, which means a trial or test.
💧 Too much water can harm plant growth — overwatering can drown roots and slow development.
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