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HSC Biology

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Lesson 4, Topic 6
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Hypotheses, Theories and Models of and about Plants

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Photosynthesis

  • Jan Baptista van Helmont
    • An incorrect conclusion that water, on its own, makes plants grow.
  • John Priestly
  • Jan Ingenhousz
  • Jean Senebier

Transpiration-cohesion-tension Theory

  • Water in the xylem is pulled upwards
  • Creates negative pressure, i.e. tension
  • Tension extends from leaves to roots
  • Transpiration’s effect on water = straw