What are plants made of? What do plants look like at different scales? 1

Plants are made of cells 2 Benchmark Scale Power of Ten Decimal Style Large scale Larger Larger 100,000 10,000 1,000 Macroscopic meter Microscopic Atomic- molecular Smaller Smaller Scale: 10 0 meters = 1 metersScale: meters = 0.1 metersScale: meters = 0.01 metersScale: meters = meters Scale: meters = metersScale: meters = meters Scale: meters = meters Scale: meters = meters Scale: meters = meters Scale: meters = meters Plant cells are made of molecules Plant molecules are made of atoms

Using what you know about atoms to make predictions You may already know: Atoms last forever, so all the atoms in a plant must come from somewhere Plants need water, air, sunlight, and soil nutrients to grow and survive You may not know that the dry mass of a garden plant includes these atoms: Carbon (about 45%) Oxygen (about 45%) Hydrogen(about 6%) Nitrogen, phosphorous, and all other atoms (about 4%) 3

Making predictions Predicting mass changes What materials will gain and lose mass when plants grow? How are the mass changes connected with The Movement Question: Where are atoms moving? Use arrows on the worksheet to show your ideas

Using tools for investigation: Biochambers What can the sensors tell us about which molecules are moving in and out of plants? What would a graph of carbon dioxide look like if the plant was RELEASING CO2? What would a graph of carbon dioxide look like if the plant was ABSORBING CO2? 5

Making predictions Predicting atmospheric changes: How will the plants in the light and in the dark change the atmosphere in the biochambers? How are these changes connected to The Carbon Question: What is happening to carbon atoms? Explain your ideas on the worksheet.

Using what you know about energy to make predictions You may already know: Energy lasts forever, so all the chemical energy in a plant must come from somewhere Plants need water, air, sunlight, and soil nutrients to grow and survive You may not know that the dry mass of a garden plant includes organic molecules with many high- energy bonds. 7

Making predictions Predicting energy changes What forms of energy are coming into the plant? What forms of energy are stored in the plant? How are the energy changes connected to The Energy Question: What is happening to chemical energy? Explain your ideas on the worksheet.