CourseCourseConceptConceptDocumentDocument

IB Biology HL B4.2.6 Saprotrophic Nutrition Questions

Study external digestion by saprotrophic fungi and bacteria, compare saprotrophs with detritivores and apply decomposition to sewage treatment in IB Biology HL B4.2.6.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Define saprotrophs by enzyme secretion onto dead organic matter and absorption of digested products.
  • Compare detritivores’ ingestion and internal digestion with saprotrophs’ external digestion and absorption.
  • Interpret a fungal-nutrition pie chart to identify saprotrophy as the largest feeding category.
  • Outline how saprotrophic bacteria decompose sewage in an aerobic trickling filter bed.

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

All question bank results loaded