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Plant Hormones and Tropisms Response in Plants

Plant Hormones and Tropisms Response in Plants. TROPISM. is a biological phenomenon, indicating growth or turning movement a plant demonstrates in response to an environmental stimulus. TROPISM. POSITIVE. NEGATIVE. If the plant moves AWAY from the stimulus.

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Plant Hormones and Tropisms Response in Plants

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  1. Plant Hormones and TropismsResponse in Plants

  2. TROPISM is a biological phenomenon, indicating growth or turning movement a plant demonstrates in response to an environmental stimulus

  3. TROPISM POSITIVE NEGATIVE If the plant moves AWAY from the stimulus • If the plant moves TOWARD the stimulus

  4. Phototropism Movement of plants toward light Why? Maximize amount of sun for photosynthesis to make their food. Phototropism http://www.youtube.com/watch?NR=1&v=KQOC_bPrqFs&safety_mode=true&persist_safety_mode=1

  5. Gravitropism Movement of plants in response to gravity Positive is toward gravity (roots grow down) Negative is away from gravity (shoot, stems, and leaves grow up) Why? Allows plants to grow properly and get nutrients and sunlight http://www.youtube.com/watch?v=mYZXax8V_L0&feature=related&safety_mode=true&persist_safety_mode=1

  6. Hydrotropism Movement by plants toward water. Why? Roots search for and grow toward water, because it is needed for photosynthesis and to support cell structure. http://virtualastronaut.tietronix.com/textonly/act25/text-plants.html

  7. Thigmotropism Plants moving in response to touch. Positive is toward touch (vines wrap around structures) Negative is away from touch (some plants close up when touched) http://www.youtube.com/watch?v=8HeedWWe6VA&feature=related&safety_mode=true&persist_safety_mode=1 Why? to support leaves as they grow higher to reach the sun to make more food (photosynthesis).

  8. Gravitropism • Gravity causes a response in plant growth • In the picture above, which part of the plant exhibits positive tropism, and which exhibits negative tropism?

  9. Hydrotropism • The way a plant grows or bends in response to water • Why would it be important for some parts of a plant to be pulled toward water?

  10. Thigmotropism • Plants bend and grow because of touch. • What are some other ways a plant can be “touched”?

  11. Phototropism • The way a plant grows or bends in response to light. • Why do you think sunflowers were given their nickname?

  12. Hydroptropism

  13. Gravitropism

  14. Phototropism

  15. Gravitropism

  16. Phototropism

  17. Thigmotropism

  18. HORMONES • A hormone is a chemical substance that controls a plant’s patterns of growth and development as well as a plant’s responses to environment • Hormones belong to the lipid class of biomolecules

  19. AUXINS Produced in the apical meristem Stimulate elongation of plant stem cells Trigger phototropism (more on this later) Inhibit lateral bud growth

  20. CYTOKININS • Plant development through cell division • Delay leaf loss by plant and help transport auxins through the plant

  21. NASTIC MOVEMENTS • Hormones in plants or animals do not cause rapid changes. Rapid responses are due to changes in osmotic pressure (mimosa leaves, Venus fly trap) • Nastic Movements – Movement without growth

  22. TROPISM QUIZ Identify the type of tropism in the following pictures

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  29. 7 • http://www.youtube.com/watch?v=Ze8NV7cvW8k&feature=results_main&playnext=1&list=PL5464C68C7644DD4D&safety_mode=true&persist_safety_mode=1

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  32. 11 • http://www.youtube.com/watch?v=9sggQQuBU40&feature=related&safety_mode=true&persist_safety_mode=1

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  36. 18 • http://www.youtube.com/watch?v=Zq3UuHlPLQU&feature=related&safety_mode=true&persist_safety_mode=1

  37. 19

  38. 20 • http://www.youtube.com/watch?v=frmyzIhD29Q&safety_mode=true&persist_safety_mode=1

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