B4 Nutrient Cycles

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Across
  1. 2. Rate at which energy is converted into biomass
  2. 3. Dead organic material that provides food for decomposers
  3. 6. Removal of undigested food from the digestive system
  4. 8. Loss of soluble minerals from soil by water movement
  5. 11. Organisms that convert light energy into chemical energy
  6. 13. Element needed to make amino acids and proteins
  7. 14. Process that transfers light energy into chemical energy
  8. 16. Mineral ion often limiting plant growth in ecosystems
  9. 19. Organisms that break down dead material and waste
  10. 20. Simple feeding relationship showing energy flow
  11. 24. Nitrogen-containing ion produced during decay
  12. 25. Process that converts atmospheric nitrogen into usable compounds
  13. 26. Total chemical energy store in biomass before respiratory losses
  14. 27. Total mass of living material in an organism or trophic level
  15. 28. Process that releases energy from organic molecules
  16. 29. Chemical energy store remaining after respiratory losses
Down
  1. 1. Process that releases ammonium compounds from dead organisms
  2. 4. Community of organisms interacting with their environment
  3. 5. Microorganisms that feed on dead organic matter
  4. 6. Percentage of energy successfully passed to the next trophic level
  5. 7. Ions absorbed by plants to make proteins
  6. 8. Energy not passed on to the next trophic level
  7. 9. Breakdown of organic matter by microorganisms
  8. 10. Process that returns nitrogen gas to the atmosphere
  9. 12. Network of interconnected food chains
  10. 15. Removal of waste products from an organism
  11. 17. Feeding level within a food chain or food web
  12. 18. Gas removed from the atmosphere by photosynthesis
  13. 21. Conversion of ammonium ions into nitrates by bacteria
  14. 22. Movement of energy between organisms in a food chain
  15. 23. Organisms that obtain energy by feeding on others