survival and response

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Across
  1. 7. direction of growth determined by direction of gravity
  2. 8. IAA causes this in shoots and inhibits in roots
  3. 9. can detect change
  4. 10. a detectable change
  5. 11. growth response
  6. 13. direction of growth determined by direction of light
  7. 15. direction of movement determined by direction of chemical
  8. 17. result of detecting change
  9. 19. brings about response, usually a muscle or gland
Down
  1. 1. roots grow towards for anchoring
  2. 2. movement in random directions, with varying speed and frequency
  3. 3. roots grow towards for metabolic processes
  4. 4. movement in a specific direction
  5. 5. controls response
  6. 6. shoots grow towards
  7. 12. towards stimulus
  8. 14. plant growth factor
  9. 16. away from stimulus
  10. 18. speed and frequency of movement determined by presence of light