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IB Biology HL B4.2.6 Saprotrophic Nutrition Questions

Explore how fungal and bacterial saprotrophs secrete enzymes onto dead matter, absorb digestion products and recycle nutrients while respiration releases heat in IB Biology HL…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Define saprotrophs as organisms that secrete enzymes into dead organic matter, digest it externally and absorb the products.
  • Explain how fungal or bacterial saprotrophs decompose organic waste and recycle inorganic nutrients while respiration dissipates energy as heat.

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

IB Biology HL B4.2.6 Saprotrophic Nutrition Questions question 1

[Maximum number: 1]

The pie chart shows the modes of nutrition of fungi in Huahu Lake wetland in China.

Figure for Question IB Biology HL B4.2.6 Saprotrophic Nutrition Questions question 1 — IB Biology HL

What is the most common mode of nutrition of fungi in this wetland?

A

Heterotrophic fungi that feed on living organisms by ingestion

B

Autotrophic fungi that obtain organic nutrients from detritus by internal digestion

C

Fungi that have either an autotrophic or heterotrophic method of nutrition

D

Heterotrophic fungi obtaining nutrients from dead organisms by external digestion

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