Across
- 5. a plants response to the amount of daylight and nighttime it receives daily
- 6. plants that have no specific photoperiod
- 8. a process that breaks down food and releases energy
- 9. plants that require 12 hours or more to flower
Down
- 1. plants that require 10 to 12 hours of darkness to flower
- 2. green pigment that absorbs light energy to make food
- 3. act as doorways for raw materials to enter and exit the leaf
- 4. a plant hormone that allows the plant to exhibit positive responses to light
- 7. plant responses to external stimuli