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PLANT TROPISM

PLANT TROPISM. Objectives. Identify tropisms in plants. Examine effects of tropisms in plants. Recall differences in tropisms and effects of tropisms in plants. What is Tropism?. A growth movement whose direction is determined by the direction from which the stimulus strikes the plant.

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PLANT TROPISM

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  1. PLANT TROPISM

  2. Objectives • Identify tropisms in plants. • Examine effects of tropisms in plants. • Recall differences in tropisms and effects of tropisms in plants.

  3. What is Tropism? • A growth movement whose direction is determined by the direction from which the stimulus strikes the plant.

  4. Negative & Positive Tropisms 1. Negative Tropism 2. Positive Tropism

  5. Positive Tropism • Grows in the direction from which the stimulus originates .

  6. Negative Tropisms • Growth away from the stimulus.

  7. http://www.cccmkc.edu.hk/~sbj-biology/AL%20BIO/Continuity%20of%20life%20growth%20and%20development/Growth%20and%20development_image/Tropism_image/Phototropism%20in%20mung%20bean%20seedling.jpghttp://www.cccmkc.edu.hk/~sbj-biology/AL%20BIO/Continuity%20of%20life%20growth%20and%20development/Growth%20and%20development_image/Tropism_image/Phototropism%20in%20mung%20bean%20seedling.jpg

  8. 4 TYPES OF TROPISMS • Phototropism • Geotropism • Hydrotropism • Thigmotropism

  9. PHOTOTROPISM • Response to light

  10. GEOTROPISM or GRAVITROPISM • Response to gravity

  11. HYDROTROPISM • Response to water

  12. THIGMOTROPISM • Response to touch

  13. Summary What is a tropism? • A growth movement towards a stimulus. • 4 Types of Tropisms • Phototropism-growth toward light. • Geotropism-growth due to gravity. • Hydrotropism-growth toward water. • Thigmotropism -growth due to touch.

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