Botanical Leaf Stomata Evaporation Bag Chamber

60 mins Ages 7-9 Outdoor

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

Materials Needed

  • • Clear 1-gallon plastic zip bag or clear food bag (1 unit)
  • • Twist tie or string (1 unit)
  • • Small clean pebble (for weight) (1 unit)
  • • Living sunlit tree branch with leaves (outdoor access)

Pro Tips

  • → Pick a leafy, sun-exposed outdoor branch on a deciduous tree like maple, oak, or fruit trees.
  • → Slip a clear plastic bag over 5–6 healthy leaves and tie the neck of the bag tightly around the twig with a twist tie.
  • → Place a small pebble inside the lowest corner of the bag so condensed transpiration water pools in one spot.

Safety First

Do not break or snap the living tree branch; tie gently to avoid barking the stem.

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Step-by-Step Instructions

1

Step 1

Locate a healthy, sunlit tree branch with clean, vibrant green leaves on an outdoor walk.

2

Step 2

Drop a small pebble into the corner of a clear plastic zip-lock bag and slip the bag over a leafy branch tip.

3

Step 3

Tie the mouth of the bag securely around the woody stem using a twist tie or string to create an airtight seal.

4

Step 4

Leave the bag in direct sun for 45 minutes, returning to measure the droplets of transpired water pooled at the bottom.

What they are learning

Plant vascular transpiration rates Stomatal water vapor release Microclimate condensation mechanics