Plant Vascular Micro-Section Dye Transpiration

45 mins Ages 7-9 Indoor

An engaging, screen-free learning activity that builds real-world creativity and critical thinking for kids aged 7 to 9.

Materials Needed

  • • Fresh leafy celery stalk (2 stalks)
  • • Liquid food coloring (dark blue or red) (1 bottle)
  • • Clear drinking glass (1 unit)
  • • Magnifying glass (1 unit)
  • • Cutting board and knife (adult prep) (1 set)

Pro Tips

  • → Pick celery stalks with abundant leafy greens; leaves act as evaporation engines that drive transpiration.
  • → Trim 1 cm off the base of the stalk underwater before placing it in the dye to clear air bubbles from the xylem tubes.
  • → Slice razor-thin cross-sections across the stem after 3 hours to view colored xylem rings under magnification.

Safety First

Adult slices the celery cross-sections with a sharp blade.

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Step-by-Step Instructions

1

Step 1

Fill a tall glass with warm water and stir in 15 drops of dark blue or red food coloring.

2

Step 2

Trim 1 cm off the bottom of a fresh celery stalk and immerse it into the colored solution.

3

Step 3

Observe the celery periodically over 2 hours as the colored water climbs the stalk into the leafy tips.

4

Step 4

Cut a thin cross-section across the stalk and inspect the isolated ring of colored xylem vascular tubes under a magnifying glass.

What they are learning

Xylem vascular tube transport Transpiration pull dynamics Plant anatomical tissue cross-sections