N5 Unit 3

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Across
  1. 3. type of pyramid which is always the right shape
  2. 5. factors such as predation and grazing
  3. 6. the range of different species present in an ecosystem
  4. 8. factors such as temperature and pH
  5. 9. pyramid type which can be oddly shaped
  6. 11. type of species whose presence or absence tells us about pollution
  7. 14. competition between different species
  8. 16. these will use up all the oxygen in a pond if algal bloom is present
  9. 18. animal which eats other animals
  10. 19. chemical used to kill species harmful to crops
Down
  1. 1. equipment used to sample plants in an ecosystem
  2. 2. eats only plants
  3. 4. term describing build up of pesticides in food chains
  4. 7. all the different plants and animals in an ecosystem
  5. 10. type of control which can be used instead of pesticides
  6. 12. animal which hunts for food
  7. 13. used to sample animals in an ecosystem
  8. 15. paired ????????? keys can be used to identify living things
  9. 17. green plant