IB Biology SL B4.2.5 Mixotrophic Nutrition Questions

Practise interpreting Euglena feeding on bacteria while using CO2, and Micromonas receiving energy from sunlight and bacteria, in IB Biology SL B4.2.5.

Exam points

Identify mixotrophs from evidence of both photosynthesis and heterotrophic feeding.
Compare Euglena and Chlorella by autotrophic versus heterotrophic nutrition.

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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 IB Biology SL B4.2.5 Mixotrophic Nutrition Questions question 1 — IB Biology SL

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

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IB Biology SL B4.2.5 Mixotrophic Nutrition Questions question 1