Cycles and Human influence- biology

123456789101112131415161718192021222324252627
Across
  1. 1. A diagram that shows how the element carbon cycles in different forms between living organisms and the environment
  2. 4. Atmospheric gases, such as carbon dioxide and water vapour, that trap some of the heat radiated from the Earth’s surface and prevent it escaping into space. Water vapour, Carbon dioxide, Nitrous oxides, methane, CFCs
  3. 6. Formed when trees are buried in swampy ground under heat and pressure for millions of years without normal decay
  4. 7. The transfer of water from the ground to the atmosphere by the combined effects of both evaporation from the soil and transpiration from plants. (Triple only)
  5. 8. Warming effect caused by greenhouse gases in the atmosphere that prevent some of the heat energy radiated by the Earth’s surface escaping into space.
  6. 13. An increase in the greenhouse effect most likely caused by the release of additional greenhouse gases from human activity.
  7. 14. erosion The washing away of soil as a result of rainfall when there is little vegetation to hold on to the soil. (Triple only)
  8. 15. The uptake of carbon dioxide from the atmosphere and its conversion of carbon compounds in plants
  9. 17. Human waste, faeces and urine, which needs to be disposed of
  10. 18. Formed from the bodies of tiny marine organisms under heat and pressure for millions of years
  11. 19. The chemical process in which glucose is broken down in the mitochondria in cells, releasing energy and producing carbon dioxide and water
  12. 21. Peat, oil and coal
  13. 22. When a lake or pond becomes enriched with nutrients. This can be a problem as it can cause algal blooms resulting in the death of aquatic organisms.
  14. 24. Damage to the lining of the lungs, leaf damage to plants, damage to the skin of fish and frogs. Disruption of food webs
  15. 25. Water that contains a higher than normal concentration of dissolved acidic gases such as sulphur dioxide and nitrogen oxides, which cause the water to have a lower pH than normal
  16. 26. Colourless and odourless gas. Produced by burning fuels in insufficient oxygen. Binds irreversibly to haemoglobin and reduces the delivery of oxygen to tissues eg heart and brain
  17. 27. The process by which plants absorb light energy, carbon dioxide and water to create glucose and oxygen
Down
  1. 2. Burning of fossil fuels to release carbon dioxide
  2. 3. An organism that causes decay of dead or waste material. Eg fungi or bacteria
  3. 5. The warming of the Earth’s surface and atmosphere, possibly as a result of an enhanced greenhouse effect
  4. 9. Conversion of atmospheric nitrogen into ammonium ions by nitrogen-fixing bacteria in root nodules of leguminous plants or free in the soil. (Triple only)
  5. 10. The process which converts dead or waste material to ammonium ions.
  6. 11. Conversion of nitrates in the soil into atmospheric nitrogen by denitrifying bacteria. (Triple only)
  7. 12. The decay of dead plants and animals and their waste materials
  8. 16. Conversion of ammonium ions into nitrites and then nitrates by nitrifying bacteria. Nitrates are actively transported into plants via the root hair cells. (Triple only)
  9. 20. The destruction of large areas of forest or woodland.
  10. 23. The breakdown of dead or waste material by decomposers