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Cycling of matter in ecosystems

This classroom material guides 7th-grade students through practicing key concepts of matter cycling in ecosystems, including the carbon and nitrogen cycles and the role of decomposers. Students respond to multiple-choice and sequencing questions, and fill-in-the-blank exercises to reinforce understanding of processes and terminology.

By Edform · Science · Grade 7 · Published Oct 15, 2026 · New

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Questions

  1. Which process adds carbon dioxide to the atmosphere during the carbon cycle?
  2. Which of the following are roles of decomposers in an ecosystem?
  3. Put these steps of the nitrogen cycle in the correct order, starting with nitrogen in the atmosphere.
  4. Fill in the blank with the correct word: Plants take in carbon dioxide from the atmosphere during ___.
  5. Sort each item as part of the carbon cycle or the nitrogen cycle.

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