HS-LS2-5
The standard
Develop a model to illustrate the role of photosynthesis and cellular respiration in the cycling of carbon among the biosphere, atmosphere, hydrosphere, and geosphere.
Next Generation Science Standards
What this standard means
Students need to build and explain a model showing how carbon moves through living things, air, water, and rocks or soil. They should connect photosynthesis to carbon entering plants and cellular respiration to carbon returning to the atmosphere or water. They do not need the detailed chemical pathways.
Mastery looks like a clear diagram, simulation, or simple mathematical model with labeled reservoirs, arrows, and process explanations. Students often mix up energy flow with matter cycling, forget the ocean or geosphere, or describe photosynthesis and respiration as opposite processes without showing where the carbon goes.
Ways to teach it
- Have students use sticky notes and string to build a classroom carbon cycle model linking plants, animals, air, ocean, soil, and limestone.
- Ask students to write: How would carbon atoms from your breakfast become part of the atmosphere by tomorrow?
- Give a blank carbon cycle diagram and ask students to add arrows for photosynthesis, respiration, decomposition, ocean exchange, and burial.
- Use a local example, such as trees near school or car exhaust, to trace carbon movement through air, plants, soil, and water.
Plan a lesson for HS-LS2-5
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Related standards
- MS-LS2-3
Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.
- MS-ESS2-1
Develop a model to describe the cycling of Earth's materials and the flow of energy that drives this process.
- HS-ESS2-6
Develop a quantitative model to describe the cycling of carbon among the hydrosphere, atmosphere, geosphere, and biosphere.
- 5-ESS2-1
Develop a model using an example to describe ways the geosphere, biosphere, hydrosphere, and/or atmosphere interact.