MS-LS2-3
The standard
Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.
Next Generation Science Standards
What this standard means
Students need to build and explain a model of an ecosystem that shows matter cycling and energy moving through living and nonliving parts. They should include producers, consumers, decomposers, sunlight, air, water, soil, and waste. They also need to set clear system boundaries, such as a pond, forest floor, or classroom terrarium.
Mastery looks like a labeled diagram or physical model with arrows that make sense. Matter should cycle back through decomposers and abiotic parts. Energy should enter, move through organisms, and leave as heat. Students often mix up matter and energy, forget decomposers, or draw arrows without explaining what moves.
Ways to teach it
- Build a sealed mini-ecosystem with soil, leaves, decomposers, and a small plant, then label where matter cycles and energy enters.
- Prompt students to explain: How is a dead leaf still part of the food web after it falls?
- Give a pond diagram and ask students to add three matter arrows, three energy arrows, and one system boundary.
- Use a school compost bin or leaf pile to trace how food scraps become matter used by plants again.
Plan a lesson for MS-LS2-3
Generate a complete lesson plan aligned to this standard, with objectives, activities, and materials. Free, no account needed.
Related standards
- HS-LS2-4
Use a mathematical representation to support claims for the cycling of matter and flow of energy among organisms in 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-LS2-1
Develop a model to describe the movement of matter among plants, animals, decomposers, and the environment.