Topic 4: Ecology

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Across
  1. 5. Occasionally members of different species breed together
  2. 7. Organism that are not exclusively autotrophic or heterotrophic are called
  3. 10. Light energy are converted to chemical energy in _
  4. 11. Convert carbon dioxide into carbohydrates and other carbon compounds.
  5. 13. Ocean _ become more severe if the carbon dioxide concentration of the atmosphere increases.
  6. 14. Name the unicellular organism that uses both method of nutrition
  7. 15. Energy released by respiration is used in living organism and converted to _
  8. 16. Global temperatures can be deduced from ratios of _ isotopes in the water molecule.
  9. 17. What are the heterotrophs that obtain organic nutrients from dead organic metal by external digestion
  10. 18. _ forms when organic matter is not fully decomposed because of anaerobic conditions in waterlogged soils.
  11. 19. Main supply of energy
Down
  1. 1. Biomass of higher trophic level is _ than lower levels
  2. 2. Animals such as reef-building corals and molluscs have hard parts that are composed of calcium carbonate and can become fossilized in _
  3. 3. Biologists who study the timing of seasonal activities in animals and plants.
  4. 4. The increase in the combustion of _ organic matter cause an increase in the atmospheric carbon dioxide.
  5. 5. In aquatic habitats _ is present as a dissolved gas and hydrogen carbonate ions.
  6. 6. _ is produced from organic matter in anaerobic conditions by methanogenic archaeans and some diffuses into the atmosphere
  7. 8. When twin members of the same species meet and produce offsprings, they are _
  8. 9. Organism in a trophic level are not usually entirely _ by organism in the next trophic level
  9. 12. Where does methane emitted from?