The eye

Edit Answers
1234567891011121314151617181920
Across
  1. 4. Change in environment that affects an organism
  2. 5. Opening that lets light into the eye
  3. 7. Bending (of light)
  4. 9. White outer layer of the eyeball
  5. 10. Photoreceptor cells providing black-and-white images
  6. 11. Transparent layer forming the front of the eye
  7. 12. Part of the nervous system adapted to receive stimuli
  8. 13. Jelly-like substance that helps keep shape of eyeball (8,6)
  9. 15. Adjusting for near and distant objects
  10. 16. Area of eye providing maximum sharpness of vision
  11. 18. Ability to respond to stimuli
Down
  1. 1. Transparent, biconvex body found behind the iris that focuses light on the retina
  2. 2. Exit point of the optic nerve (5,4)
  3. 3. Fibrous membrane that holds the lens of the eye in place (10,8)
  4. 6. Device that converts one form of energy into another
  5. 8. Watery fluid supporting cornea and front chamber of the eye (8,6)
  6. 14. Part of eye containing photoreceptor cells
  7. 17. Layer at back of eyeball containing light-sensitive cells
  8. 19. Sense that depends on mechanical stimulation of the skin
  9. 20. 'Colour' of the eye