The eye and tropism

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Across
  1. 3. Layer at the back of the eye onto which an image is formed
  2. 5. Dark layer which prevents light bouncing around inside the eye. Contains blood vessels
  3. 7. Plant growth in response to gravity
  4. 9. Plant growth in response to light
  5. 10. Changes shape to focus an image
  6. 11. When CILIARY contracts, the lens becomes more _________, to see near objects
  7. 14. In short sighted people, the _____________ (5,5) is infront of the retina
  8. 16. In dim light, pupils ________
  9. 19. Plant growth in response to a stimulus
  10. 20. Cells which work well in dim light
Down
  1. 1. Transparent window allowing light into the eye. This layer also refracts light
  2. 2. A plant hormone which engages in PHOTOTROPISM
  3. 4. The changes in the eye which allow us to see objects at different distances
  4. 6. Transmits nerve impulses to the brain (5,5)
  5. 8. Tough outer coat of the eye
  6. 12. Hole in the middle of IRIS
  7. 13. Cells which work in bright light and can detect colour
  8. 15. Muscles which relax and contract depending on the distance of an object
  9. 17. Coloured ring of tissue in the eye
  10. 18. Area in RETINA on which most light is focussed