Mississippi Science L.7.3.1
The Standard
- L.7.3
- Students will demonstrate an understanding of the importance that matter cycles between living and non-living parts of the ecosystem to sustain life on Earth.
Analyze diagrams to provide evidence of the importance of the cycling of water, oxygen, carbon, and nitrogen through ecosystems to organisms.
2026 Mississippi College- and Career-Readiness Standards for Science · Ecology and Interdependence
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students follow arrows for water, oxygen, carbon, and nitrogen on ecosystem diagrams. They explain how each substance reaches living things and why organisms need a continuing supply.
What Mastery Looks Like
- A student can trace all four substances between living things and the air, water, or soil. They use specific arrows to show where plants get water, carbon, and nitrogen, and where animals get oxygen.
Common Misconceptions
- Students may read arrows as showing where organisms move, rather than where substances move. Some think plants take nitrogen gas straight from the air. Others think water is used up by roots or carbon disappears when animals breathe out.
How to Assess It
- Give students a diagram showing rain, photosynthesis, respiration, and bacteria returning nitrogen to soil. Ask them to trace each substance and explain how its path helps an organism.
Lesson moves
Ways to Teach It
Use four yarn colors on a pond diagram with labeled photosynthesis and soil bacteria; trace each substance and label one organism that uses it.
Point to rain entering soil and nitrogen entering roots on a pond diagram; ask, "What happens to the plants if either stops?"
Give pairs cards labeled evaporation, photosynthesis, respiration, and nitrogen fixation; have them place each on a diagram and name an organism helped.
Read a fertilizer label marked "nitrogen"; use a nitrogen-cycle diagram to show how soil nitrogen reaches tomato plants.
Keep exploring
Related Standards
- ENV.1.5
Develop and use models to diagram the flow of nitrogen, carbon, and phosphorus through the environment.
- BIO.5.2
Analyze models of the cycling of matter (e.g., carbon, nitrogen, phosphorus, and water) between abiotic and biotic factors in an ecosystem and evaluate the abil...
- ENV.3.1
Use a model to describe cycling of carbon through the ocean, atmosphere, soil, and biosphere and how increases in carbon dioxide concentrations have resulted in...
- FB.6.2
Use models to analyze the cycling of matter in an ecosystem (e.g., water, carbon dioxide/oxygen, nitrogen).
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