![]() Explain that plants convert energy from one form to another so that it can be stored in sugar molecules. Folded in a triangle, they represent “chemical energy” that they plant can use. Folded in a rectangle, they represent “light energy” from the sun. (From sunlight.) However, the energy in light is not in a form that can be used by a plant. Ask students where the leaves get this energy. To represent this, students will have to pack an energy token under each atom in the sugar frame. Explain that sugar molecules store energy. Some of the oxygen atoms will come from CO 2 molecules and some from H 2O molecules.How does water get into the leaf? (It is drawn from the soil into the roots, up the stem, and into the leaf.) Place the filled H 2O molecules under the sign. The hydrogen atoms will be coming from water molecules (H 2O).Open the door and place filled CO 2 molecules just outside. Where is CO 2 found? (In the air.) How does CO 2 gets into the leaf? (CO 2 in the air enters the leaf through the stomata.) Tell students that the classroom represents the leaf and the area outside the room represents the air surrounding the leaf. Tell students the carbon atoms will be coming from carbon dioxide molecules (CO 2).A molecule is made of two or more atoms bonded together. An atom is the smallest possible piece of a pure substance, like carbon or hydrogen. If appropriate for your students, review the difference between atoms and molecules.When they are closed, the inside of the leaf is sealed off from the outside air. When the stomata are open, air can move in and out of the leaf. Review (or introduce) the concept of stomata, which are small openings on the underside of the leaf.Let them brainstorm ideas, then tell them they will discover this through the activity. Have students discuss with a partner what they think plants need in order to do photosynthesis.Some of the sugar molecules become part of the structure of the plant in the form of cellulose. Through photosynthesis, plants create sugar molecules that store energy for them to use later. This is the process that plants use to get energy (whereas humans and other animals get energy by eating food). Review (or introduce) the term photosynthesis.Prepare filled H 20 and C0 2 “molecules.” As you describe the simulation to your students, you’ll place the water near the sink, the carbon dioxide in the hallway, and the empty oxygen frames in the hallway, too.Ĭonsider using the Travel Deep Inside a Leaf video to "set the stage" for what the classroom looks like.The door will be the “STOMATA” and the sink (or a place of your choice) will be the “STEM”. ![]() Prepare them for the simulation start by folding in half to represent “light energy.” Each group of students will need at least 24 energy tokens.
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