Unit 2 Vocabulary

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Across
  1. 3. Selecting the strongest plants of each generation to parent the next generation.
  2. 8. Adding material that will change the purity or usefulness of a substance.
  3. 10. System Receives and treats human waste.
  4. 12. Containing harmful chemicals or organisms.
  5. 13. Machine that is used to cut and thresh seed crops such as grain.
  6. 14. Widespread starvation.
  7. 15. Food made by boiling and crushing soybeans and letting it coagulate into curds.
  8. 17. Plow with a curved bottom that will turn prairie soils.
  9. 19. Plant or animal offspring from crossing two different species or varieties.
  10. 21. Organism that lives in or on other organisms with no benefit to the hosts.
  11. 22. Machine that milks cows and goats.
  12. 23. Superior baking potato bred to grow well in the Northeast.
  13. 25. Devices used to determine wavelengths given off by plants.
Down
  1. 1. Plant in which certain nitrogen-fixing bacteria utilize nitrogen gas from the air and convert it to nitrates that the plant can use as food.
  2. 2. Apartment building or unit in which the apartments are individually owned.
  3. 4. Machine that removes ears of corn from stalks.
  4. 5. Physically putting certain genes into the cells of a plant or animal.
  5. 6. Natural substances in blood that fight diseases and infections.
  6. 7. Machine that removes cotton seed from cotton fiber.
  7. 9. Any edible material used for animal feed.
  8. 11. Process in which many countries became self-sufficient in food production.
  9. 15. One of a row of houses connected by common side walls.
  10. 16. Popular potato variety of the 1930s.
  11. 18. Machine that cuts grain.
  12. 20. Source of power for belt-driven machines as well as for pulling.
  13. 24. Potato grown in volcanic soils of Idaho and the Northwest; greater resistance to disease and insects results in greater yields.