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IB Biology SL B4.2.6 Saprotrophic Nutrition Questions

Explore how fungi and bacteria digest dead organic matter outside the body, absorb soluble products and return inorganic nutrients to ecosystems in IB Biology SL B4.2.6.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Define saprotrophic nutrition as secreting digestive enzymes onto dead organic matter and absorbing the soluble products of external digestion.
  • Explain how saprotrophs such as fungi and bacteria decompose dead material and recycle inorganic nutrients, with energy lost as heat through respiration.

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Study B4.2.6—Saprotrophic nutrition conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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