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IB Biology SL 4.1.5 Mixotrophic Nutrition Question Bank

Practise IB Biology SL 4.1.5 by classifying organisms that combine photosynthesis with feeding on other organisms.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify mixotrophs that combine photosynthesis with heterotrophic feeding.
  • Use Euglena, pitcher plants and dinoflagellates to distinguish mixed nutrition modes.

B4.2.5—Mixotrophic nutrition question 1

[Maximum number: 1]

Psammonobiotus balticus belongs to a group of protists (unicellular eukaryotic organisms) that have a shell surrounding most of the cell, which provides shelter from predators. The graph shows the frequency of varying shell lengths in a population of P. balticus.

Figure for Question B4.2.5—Mixotrophic nutrition question 1 — IB Biology SL

Outline the reason that some species of protists are classified as mixotrophs.

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