Nutrient recycling: Carbon and Nitrogen Cycles

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Across
  1. 5. Dark organic material in soil formed from decomposed matter.
  2. 10. Conversion of nitrates back into nitrogen gas.
  3. 11. Fertiliser source derived from plant or animal waste.
  4. 12. Process that releases energy from glucose in cells.
  5. 16. Organism that breaks down dead organic matter and waste.
  6. 18. Substances added to soil to replace lost nutrients.
  7. 19. Element that cycles through living organisms and the atmosphere.
  8. 21. Element needed for amino acids and proteins.
  9. 23. Biological catalyst used to break down complex molecules.
  10. 26. Convert nitrogen gas into ammonia.
  11. 27. Organism that feeds on dead organic material by external digestion.
  12. 29. Organism that obtains energy by feeding on others.
  13. 30. Hair cell that increases surface area for absorption of minerals.
  14. 31. Process where plants use light to convert carbon dioxide and water into glucose.
  15. 32. Loss of soluble nutrients washed out of soil by rain.
  16. 33. Conversion of ammonia into nitrates by bacteria.
  17. 35. Nutrient element required in small amounts for plant growth.
  18. 36. Conversion of atmospheric nitrogen into usable compounds.
Down
  1. 1. Uptake of mineral ions by plant roots.
  2. 2. Community of organisms interacting with their environment.
  3. 3. Process of recycling organic waste into nutrient-rich soil.
  4. 4. Organism that makes its own food by photosynthesis.
  5. 6. Organism that feeds on dead plant and animal material.
  6. 7. Organisms such as moulds that decompose organic matter.
  7. 8. Interconnected network of food chains.
  8. 9. Conversion of organic nitrogen into ammonia by decomposers.
  9. 13. Form of nitrogen absorbed by plants from the soil.
  10. 14. Upper layer of earth where decomposition releases nutrients.
  11. 15. Movement of carbon through organisms, air, water, and soil.
  12. 16. Process by which dead material is broken down.
  13. 17. Intermediate nitrogen compound formed during nitrification.
  14. 18. Sequence showing transfer of energy between organisms.
  15. 20. Total mass of living material in an organism or area.
  16. 22. Gas released during respiration and decomposition.
  17. 24. Method of nutrition that secretes enzymes onto dead material.
  18. 25. Breakdown of organic matter by microorganisms.
  19. 28. Nitrogen compound produced during decomposition.
  20. 34. Chemical substance needed for growth and survival.