What’s Growing on Your Hands?

Pre-K through Grade 2

Grade 3 through Grade 6

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Grade Levels Grades 3 through 5

Estimated Teaching Time

• Set-up: 30 to 45 minutes the first day
• Follow-up: 10 minutes each day for four to six days, depending on the temperature and other conditions

Interdisciplinary Connections

• Following a scientific procedure (Science)
• Comprehending requirements for biological life (Science)
• Pictorially recording seed growth (Art)

Objectives

Students will:

• Learn about the process of seed germination.
• Understand that water, light and nutrients are requirements for plant life.
• Understand that dirty or germy hands provide a place for germs to grow.

What Students Do

Students will plant fast-sprouting seeds on damp paper towels cut in the shape of a hand to illustrate that germs grow on warm, moist surfaces when water, light and nutrients are present.

Materials Required

• 1 lb. bag of fast-sprouting wheat, grass or radish seeds
• Three rolls of paper towels or thick polyester batting fabric
• Plastic plates or aluminum pie pans, one per student
• Gallon-size plastic bags, one per student
• Spray bottle
• “What’s Growing on Your Hands?” activity sheet (blackline master 1.3 PDF)
• Optional Magnifying glasses

Advanced Preparation

• Purchase seeds from a garden center or health-food store.
• Run a trial experiment one week in advance to verify seeds’ viability.
• Duplicate copies of blackline master 1.3 PDF, one per student.

Suggested Sequence

1. Talk about how germs can live on hands. Ask students what they think germs need to grow on human hands. [Moisture, organic material also called dirt and natural oils.] Tell them they are going to do an experiment that will show them how seeds grow, which is much like how germs grow.
2. Ask students to trace the shape of their hand onto six to eight layers of paper towels.
3. Align and stack all but two of the paper towel hands on the plastic plate or pie pan. Spray them with water.
4. Sprinkle about two tablespoons of seeds into the center of the stack of hands. Cover the seeds with the top two layers. Dampen down the seeds and the top layers with more sprays of water. Pour off any pools of water to prevent excess moisture. Place the plate or pan in a plastic bag, but do not seal it.
5. Have students sketch the appearance of the experiment in the area labeled “Day 1” on the worksheet.
6. Put the damp paper towel hands in a well-lit area of the classroom. Direct sunlight will make the hands too hot and should be avoided. Spray them lightly with water twice daily.
7. Each day for four to six days, students should observe the hands and make a labeled sketch on their worksheets. Students may also use magnifying glasses to examine the different parts of the sprouting seeds. Fungi (mold) may grow on some hands. If this occurs, seal the plastic bag to prevent irritating any students with allergies and ask the student whose bag was sealed to observe a classmate’s experiment.

Check for Understanding

Ask the following questions:

• What did the seeds represent?
• What conditions do seeds — and germs — need to grow?
• Do seeds grow on real hands?
• What kinds of things do grow on hands?

• Plant seeds in soil set into plastic cups with drain holes and watch them grow for a longer period of time. The cup can be decorated with a little face and students can cut its “hair.”
• Ask students to outline their hands again and draw the places where they think germs are most likely to live. [Under finger nails, around cuticles, grooves in skin, under rings.]

Words to Share

• Fungi
• Seed
• Seed germination