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Stimuli and responses in plants

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Stimuli and responses in plants

  1. 1. By : ILLANI BINTI IBRAHIM SCIENCE TEACHER MRSM TAWAU Stimuli and responses in Plants
  2. 2. <ul><li>? TROPISMS </li></ul>
  3. 3. <ul><li>The response of plants to a stimulus in a particular direction </li></ul>
  4. 4. PHOTOTROPISM GEOTROPISM HYDROTROPISM THIGMOTROPISM
  5. 5. <ul><li>-Growth movement shown by plants in response to LIGHT . </li></ul><ul><li>-Shoots grow towards light </li></ul><ul><li>->POSITIVE PHOTOTROPISM </li></ul><ul><li>-Roots grow away from light. </li></ul><ul><li>->NEGATIVE PHOTOTROPISM </li></ul>
  6. 6. <ul><li>-Growth movement shown by plants in response to GRAVITY . </li></ul><ul><li>-Roots always grow downwards - in the direction of gravity </li></ul><ul><li>->POSITIVE GEOTROPISM </li></ul><ul><li>-Shoots grow upwards away from gravity. ->NEGATIVE GEOTROPISM </li></ul>
  7. 7. <ul><li>-Growth movement shown by plant in response to WATER . </li></ul><ul><li>-Roots grow towards water.->POSITIVE HYDROTROPISM -Shoots grow away from water. -> NEGATIVE HYDROTROPISM </li></ul>
  8. 8. <ul><li>-Response by plants to TOUCH or contact with solid structure </li></ul><ul><li>-Climbing plants - have weak stems and tendrils to support their own weight such as cucumber and morning glory </li></ul><ul><li>-Ensures that these plants </li></ul><ul><li>can grow upwards </li></ul><ul><li>- towards the sunlight. </li></ul>
  9. 9. <ul><li>? NASTIC MOVEMENT </li></ul>
  10. 10. <ul><li>-The direction of responses do not depend on the direction of the stimuli. </li></ul><ul><li>-Plants responses to external stimuli from any direction -Example : </li></ul><ul><li>Mimosa plant Venus fly trap </li></ul>

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