Across
- 4. hydrotropism
- 6. chlorophyll
- 7. homeostasis
- 9. geotropism
- 11. co2
- 13. phototropism
- 15. oxygen
- 16. response
- 17. stimulus
- 19. external stimulus
Down
- 1. tropism
- 2. thigmotropim
- 3. products
- 5. photosynthesis
- 8. starch
- 10. radiantenergy
- 12. chloroplasts
- 14. internal stim
- 18. glucose
- 20. reactants