Unit B Section 3 & 4

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Across
  1. 3. growing plants without soil
  2. 5. a substance that adds nutrients to the soil, can be organic or chemical
  3. 7. when you grown only one type of crop every year
  4. 12. when you use living organisms to control the pest population
  5. 13. a characteristic of an organism that distinguishes it from another variety
  6. 15. a chemical that kills unwanted insects
  7. 18. partially decomposed organic matter
  8. 20. a chemical that kills unwanted pests
  9. 22. when humans artificially water crops
Down
  1. 1. subset of a species (where organisms are different)
  2. 2. group of organisms with similar traits that can reproduce with each other
  3. 4. when plants witdesirable traits are selected to reproduce
  4. 6. when different crops are grown from year to year
  5. 8. soil that is slippery when wet, has small spaces
  6. 9. a small piece of material found inside the plants nucleus
  7. 10. made from rock that has been broken down
  8. 11. made from plants and animals that were once living
  9. 14. the amount of useful plant that can be harvested
  10. 16. soil that is a mix of organic and mineral material
  11. 17. soil that is mostly mineral and does not hold water
  12. 18. a chemical that kills unwanted plants
  13. 19. a type of consequence when something bad happens as a result of human intervention that you didn't plan
  14. 21. a type of engineering where humans change the DNA of plants to get desireable traits