Year 8 Key Words

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Across
  1. 2. two of these split off from the trachea
  2. 4. cells that carry water around a plant
  3. 6. the number and appearance of chromosomes
  4. 7. when a hot fluid rises and a cold one sinks
  5. 9. the unit of pressure
  6. 11. part of the cell where respiration is carried out
  7. 17. the opposite of repel
  8. 19. when a species dies out
  9. 20. the green pigment in plant leaves
  10. 21. reaction in which a substance combines with oxygen
  11. 23. pores that allow gases into leaves
  12. 24. a disease when a person has an extra chromosome
  13. 25. horizontal row in the periodic table
Down
  1. 1. the change in a species over a long time period
  2. 3. the unit of force
  3. 5. measured in degrees celcius
  4. 8. separating compounds using electricity
  5. 10. what is made in a chemical reaction
  6. 12. bones that protect the lungs
  7. 13. chemical used to test for starch
  8. 14. glucose molecules linked in a chain
  9. 15. the smallest blood vessel
  10. 16. put on soil to improve plant growth
  11. 17. the mixture of gases around the Earth
  12. 18. turns to show the direction of a magnetic field
  13. 22. when a force tries to stretch something