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There are many types of tropisms : Geotropism Phototropism Thigmotropism

TROPISM Plant growth in response to a stimulus (“tropo” – ”turn”) . . . There are many types of tropisms : Geotropism Phototropism Thigmotropism. 3 main types. *Can be positive or negative. GEOTROPISM. (“Geo” – Earth). Geotropism is the growth of a plant in response to gravity.

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There are many types of tropisms : Geotropism Phototropism Thigmotropism

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  1. TROPISM Plant growth in response to a stimulus (“tropo” – ”turn”) . • There are many types of tropisms : • Geotropism • Phototropism • Thigmotropism 3 main types *Can be positive or negative

  2. GEOTROPISM (“Geo” – Earth) Geotropism is the growth of a plant in response to gravity. Negative Geotropism Positive Geotropism It is the growth of a plant towards the center of the earth-down with gravity. Ex. roots growing down Negative Geotropism It is the growth of a plant away from the center of the earth-opposite from the pull of gravity Ex. stems grow up Positive Geotropism NEXT

  3. IMPORTANCE OF GEOTROPISM • Pulls roots down to anchor a plant • Roots can get needed water and • minerals if they stay in the soil NEXT

  4. PHOTOTROPISM (“Photo” – light) The growth response of a plant in response to light direction is called phototropism. Ex. Stems growing toward the window to get to the light NEXT

  5. IMPORTANCE OF PHOTOTROPISM Enables leaves to be in the best position possible to receive adequate light for photosynthesis NEXT http://www.darienps.org/teachers/otterspoor/botany/tropisms/Gravitropismwlight.jpg

  6. THIGMOTROPISM (“Thigmo” – “touch”) Thigmotropism is the growth of a plant in response to touch/contact. Photo by Christopher Meloche Tendrils on a sweet pea Vines growing on a wall or fence NEXT

  7. What is Transpiration? Transpiration is the process by which moisture is carried through plants from roots to small pores on the underside of leaves, where it changes to vapor and is released to the atmosphere. Transpiration is essentially evaporation of water from plant leaves.

  8. Transpiration Continued Transpiration cools plants down and enables mass flow of minerals to where it is needed in the plant. Mass flow is caused by the decrease in water pressure in the upper parts of the plants due to the diffusion of water out of stomata in to the atmosphere. Water is absorbed at the roots by osmosis, and any dissolved solutes travel with it in the xylem.

  9. CORN TROPISM LAB http://www.youtube.com/watch?v=iFCdAgeMGOA&feature=related

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