Topic 4 - Ecology - Vidhi

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Across
  1. 2. Organisms that break down dead material are called _____.
  2. 3. The growth response to gravity in plants is called _____.
  3. 7. The process where ammonium is converted to nitrates is called _____.
  4. 9. Bacteria that convert nitrates back into nitrogen gas perform _____.
  5. 12. The transfer of energy between trophic levels is only about ____ percent efficient.
  6. 13. The smallest classification group is the _____.
  7. 15. Carbon dioxide is released into the atmosphere during _____.
  8. 17. Nitrogen-fixing bacteria live in the ____ of legumes.
  9. 19. Animals that feed on both plants and animals.
  10. 20. How organisms are spread out in an area.
Down
  1. 1. In a pyramid of biomass, the base is always the _____.
  2. 4. The initial source of energy for food chains is the _____.
  3. 5. Organisms that make their own food are known as _____.
  4. 6. Plants that grow towards sunlight show _____.
  5. 8. Living factors that affect abundance/distribution.
  6. 10. The process by which plants absorb carbon dioxide is called _____.
  7. 11. The process where plants take up nitrates from the soil is called
  8. 14. The name of the study of plants.
  9. 16. Organisms that feed on producers are called _____ consumers.
  10. 18. The component of the ecosystem that includes non-living factors is the