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Biology 25.1


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Biology 25.1

  1. 1. 25-1 Hormones and Plant Growth<br />Ch. 25 Plant and Responses and Adaptations<br />
  2. 2. Hormone<br />Substance produced in one part of an organism that affects another part of the same organism<br />
  3. 3. Target Cell <br />Cell that has a receptor for a particular hormone<br />
  4. 4. Phototropism<br />Tendency of plants to grow toward a source of light<br />
  5. 5. Auxin<br />Substance produced in the tip of a seedling that stimulates cell elongation<br />
  6. 6. Gravitropism<br />Response of a plant to the force of gravity<br />
  7. 7. Lateral Bud<br />Meristematicarea on the side of a stem that gives rise to side branches<br />
  8. 8. Apical Dominance<br />Phenomenon in which the closer a bud is to the stem’s tip, the more its growth is inhibited<br />
  9. 9. Herbicide<br />Compound that is toxic to plants<br />
  10. 10. Cytokinin<br />Plant hormone produced in growing roots and in developing fruits and seeds<br />
  11. 11. Gibberellin<br />Growth-promoting substance produced by plants<br />
  12. 12. Ethylene<br />Plant hormone that stimulates fruits to ripen<br />
  13. 13. Key Concept<br />Plant hormones are chemical substances that control a plant’s patterns of growth and development, and the plant’s responses to environmental conditions.<br />
  14. 14. Key Concepts<br />Auxins are produced in the apical meristem and are transported downward into the rest of the plant. They stimulate cell elongation.<br />
  15. 15. Key Concepts<br />In plants, cytokinins stimulate cell division and the growth of lateral buds, and cause dormant seeds to sprout. <br />
  16. 16. Key Concepts<br />Gibberellins produce dramatic increases in size, particularly in stems and fruit.<br />
  17. 17. Key Concepts<br />In response to auxins, fruit tissues release small amounts of the hormone ethylene. Ethylene then stimulates fruits to ripen.<br />