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Lesson Plan: Excretion in Plants Biology

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to describe the processes by which plants excrete substances and outline how some waste products can be reused by the plant.


Students will be able to

  • recall that plants produce excess waste products through metabolic reactions such as photosynthesis and respiration,
  • describe how plants excrete these waste products, including by storing in crystals, depositing in leaves, diffusing into air, guttation, and excretion from the roots,
  • state that water is removed by lenticular, cuticular, and stomatal transpiration,
  • explain how plants reuse carbon dioxide, water, and nitrogenous waste.


Students should already be familiar with

  • the fact that all living organisms (heterotrophs and autotrophs) produce waste.


Students will not cover

  • the detailed process of stomatal transpiration,
  • factors affecting transpiration (e.g., wind, light, humidity, temperature).

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