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The experiment is to show how a plant's stoma transpires H2O.
Clear plastic bottle
Clear plastic bag
Elastic or string
A lump of clay to act as a bottle stopper
Leaf with stem
In a sunny spot fill the bottle with water placing the stem of the leaf in the top making sure the stem reaches the water. With clay tightly mold around the stem to create a tight fitting stopper.Place the bag over the stem using the elastic (or string) to secure it.
Sit back and watch moisture form on the inside of the bag.
Transpiration can also been seen with fresh well watered leaves in a plastic bag left in the sun