IB Biology SL B4.2.5 Mixotrophic Nutrition Questions

Explore how Euglena, Prorocentrum and Micromonas combine light-driven carbon fixation with ingestion or organic-carbon uptake in IB Biology SL B4.2.5.

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Identify a mixotroph as an organism that combines autotrophic photosynthesis or inorganic-carbon use with heterotrophic feeding on organic matter.
Use Euglena, Prorocentrum or Micromonas evidence to distinguish combined light-driven and ingestion-based nutrition from purely autotrophic or heterotrophic modes.

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Study B4.2.5—Mixotrophic nutrition conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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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.

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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