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Name _________________________________________ Date _________________ Class _________________ Plant Hormones and Responses In your textbook, read about plant hormones. Complete the table by checking the correct column(s) for each description. (Use pg 648-650 ) Description Auxin Gibberellin Ethylene Cytokinin 1. Inhibits the dropping of fruit 2. Affects the ripening of fruit 3. Affects seed growth 4. Influenced by the presence of auxin 5. Stimulates the elongation of cells 6. Is the only known gaseous hormone 7. Creates apical dominance 8. Stimulates cell division In your textbook, read about plant responses. Write the term or phrase that best completes each statement. Use these choices: gravitropism nastic response negative tropism phototropism positive tropism solar tracking thigmotropism tropism 9. A ________________________ is a plant movement that is independent of the direction of the stimulus and is not a growth response. 10. Plant growth toward a stimulus is called ________________________ . 11. A vine can twist around a fence as it grows because of a ________________________ . 12. A ________________________ is a growth response to light caused by an unequal distribution of auxin. 13. Plants exhibit a ________________________ when they grow away from a stimulus. 14. A ________________________ is a plant’s growth response to an external stimulus. 15. ________________________ is the motion of a sunflower in relation to the changing position of the Sun. 16. When roots grow down into the soil, they are exhibiting a positive ________________________ .