Tropism

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Tropism

  1. 1. Plants Move
  2. 2. TROPISM is a biological phenomenon, indicating growth or turning movement a plant makes in response to an environmental stimulus
  3. 3. Tropismhttp://plantsinmotion.bio.indiana.edu/plantmotion/movements/tropism/tropisms.html
  4. 4. PhototropismMovement of plants toward light to maximize amountof sun for photosynthesis to make their food.Heliotropismhttp://www.youtube.com/watch?NR=1&v=KQOC_bPrqFs&safety_mode=true&persist_safety_mode=1
  5. 5. GravitropismMovement of plants inresponse to gravityPositive is toward gravity(roots)Negative is away fromgravity (shoot: stems andleaves) http://www.youtube.com/w atch?v=mYZXax8V_L0&featu re=related&safety_mode=tru e&persist_safety_mode=1
  6. 6. Hydrotropism Movement by plants toward water. Seen in roots “searching” and growing toward water which is needed for photosynthesis and to support cell structure. http://virtualastronaut.tietronix.com/textonly /act25/text-plants.html
  7. 7. ThigmotropismPlants moving in response to touch.Seen in vine plants as they wrap around otherplants or structures to support leaves as theygrow higher and higher to reach the sun tomake more food (photosynthesis). http://www.youtube.com/wat ch?v=8HeedWWe6VA&featur e=related&safety_mode=true &persist_safety_mode=1
  8. 8. Plant TropismsTropism: the way a plant grows in response to stimuli in the environment. 1) Phototropism: growth response to light  Plants bend towards light 2) Gravitrophism: growth response to gravity  plant roots grow down with gravity, shoots (stems) grow up against gravity and out of the soil. 3) Thigmotropism: growth response to touch  vines grow up around trees, Venus flytrap closes when leaves are touched
  9. 9. Slide # 23 What type of tropism is shown in these pictures? B A. C D E. F
  10. 10. Slide # 23 What type of tropism is shown in these pictures? Phototropism Gravitropism Phototropism Thigmotropism Gravitropism Thigmotropism
  11. 11. ReviewAdaptations for Life on Land Leaves – absorb energy from sun; centers for photosynthesis and gas exchange  Roots – anchor plants; absorb H2O & minerals from soil  Stems – hold plant upright; transport food & water along the plant  Flowers – produce sperm & eggs for reproduction in angiosperms  Seeds – protect embryo from damage and water loss; dispersed away from parent plant  Fruits – method of seed dispersal in flowering plants

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