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PLANT RESPONSES

PLANT RESPONSES. Do plants have minds?. ??? Read the article and decide for yourself. Do plants have stress? Do they respond?. What are some abiotic stresses faced by plants?. *Turn to a partner & list some abiotic stresses faced by plants*. Abiotic Environmental Stresses.

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PLANT RESPONSES

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  1. PLANT RESPONSES

  2. Do plants have minds? ??? Read the article and decide for yourself

  3. Do plants have stress? Do they respond?

  4. What are some abiotic stresses faced by plants? *Turn to a partner & list some abiotic stresses faced by plants*

  5. Abiotic Environmental Stresses -temperature (too hot, too cold) -amount of sunlight (too much, too little) -water availability (too much, too little) -lack of nutrients in soil -others you came up with??

  6. What are some biotic stresses faced by plants? *Turn to a partner & list some biotic stresses faced by plants*

  7. Biotic Environmental Stresses • predators (omnivores/herbivores) • disease (caused by bacteria, fungi, viruses and/or animals) • competition with other plants • others you came up with??

  8. How do plants deal with these stresses? ADAPTATIONS!

  9. Tropisms

  10. Tropisms A tropism is “the turning of all or part of an organism in a particular direction in response to an external stimulus.” It is derived from Greektroposmeaning “turning”

  11. Tropisms Can be Positive or Negative If a plant turns towards the stimulus, then it is a positive tropism. If a plant turns away from a stimulus, then it is a negative tropism.

  12. Phototropism Phototropism is “the orientation of a plant or other organism in response to light, either toward the source of light (positive phototropism) or away from it (negative phototropism).”

  13. Positive Phototropisms Stems exhibit positive phototropism when leaning towards light

  14. Negative Phototropisms http://leavingbio.net/Plant%20Responses.htm#tropisms Roots exhibit negative phototropism when growing away from the light

  15. Gravitropism Gravitropismis “the growth of a plant or other organism in response to gravity, either being pulled down by gravity (positive gravitropism) or growing against it (negative gravitropism).”

  16. Positive Gravitropism Roots exhibit positive gravitropism when growing down towards gravity

  17. Negative Gravitropism Stems & leaves exhibit negativegravitropism when growing up against gravity

  18. Thigmotropism Thigmotropisms are growth responses to touch

  19. Positive Thigmotropisms Plant stems (tendrils) exhibit positivethigmotropism when they coil around an object. Venus fly traps exhibit positivethigmotropism when they snap shut at the touch of an insect landing inside

  20. Negative Thigmotropisms Roots exhibit negativethigmotropisms when they grow away from or around an object in the soil

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