Across
- 2. Nervous System for Involuntary Response
- 4. Quick automatic response that does not involve thinking
- 6. Collects and directs sound waves into the ear canal
- 8. Lens to correct long-sightedness
- 10. Plant response to light
- 15. Eyes at the front of the head
- 18. Nervous System for Voluntary Response
- 19. Part of the eye that controls the amount of light entering
- 20. Part of the eye that converts light to nerve impulse
- 21. Plant response that does not depend of stimulus direction
Down
- 1. The central organ that controls thinking and movement
- 3. Plant response to water
- 5. Lens to correct short-sightedness
- 7. Eyes at the side of the head
- 9. Supply nutrients to the eye
- 11. Amplify sound vibrations and transfer them to the
- 12. Plant response to gravity
- 13. Tube that balances the air pressure on both sides of the eardrum
- 14. Helps focus light on the retina
- 16. Reaction of an organism to a stimulus.
- 17. Detects and converts sound vibrations into nerve impulses