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Across 1. an action or a change in behavior that occurs as a result of a stimulus 4. keep conditions constant inside the body 8. Plant tendrils can respond to the touch of a nearby limb and grow around the structure entwining like a vine 12. plant growth in response to a stimulus 13. plant growth toward stimulus

Down 2. plant growth response to light 3. plant growth away from the stimulus 5. the pressure exerted by the water in a cell against the cell wall 6. any change in the environment that affects the activity of an organism. Examples include changes in light, sound, temperature and odor 7. the bending over of a plant due to lack of water 9. a chemical that affects an organism growth and development 10. plant growth in response to gravity 11. Plant hormone that speeds up the rate at which the plant cells grow