Little Lab Coats
Roots, Stems, and Plant Support Systems
Grade 4 · Unit 2
Plants may not move from place to place, but they still need strong support systems. Roots hold a plant in place and help it take in water and nutrients. Stems help hold leaves, flowers, and fruit up where they can do their jobs.
Key vocabulary
rootstemanchorabsorb
What to notice
- Begin with a plant observation. Ask students to point to the roots and stems and predict what each structure does.
- Discuss why a plant needs to stay upright and connected from roots to leaves.
- Compare what happens above the soil and below the soil. Roots gather resources below; stems support and connect above.
Materials snapshot
- printed lesson pages and Student Worksheet
- small plant, weed, celery stalk, or plant diagram
- cup of water if observing stems
- pencil or colored pencils
Talk-about prompts
- Why would a tall plant need strong stems?
- Why are roots important even though we often cannot see them?
- How do roots and stems work together?
Why it matters
Roots usually grow into the soil, where they anchor the plant and absorb water and dissolved nutrients. Stems help support the plant body and connect the roots to the leaves and flowers. Some stems stay soft and green, while others become woody and strong, but in each case the structure supports plant survival and growth.
Try this next: Pull a weed or inspect a kitchen herb and compare the hidden root system to the visible stem system. Talk about which part helps the plant below ground and which part helps above ground.