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IB Biology HL B4.2.7 Diversity in Archaea Questions

Explore chemoautotrophic, photoheterotrophic and chemoheterotrophic energy and carbon sources, then explain methane synthesis by methanogenic Archaea in anaerobic habitats in IB…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Compare chemoautotrophs, photoheterotrophs and chemoheterotrophs by the energy source used to make ATP and the organic or inorganic carbon source used for biomass.
  • Explain that methanogenic Archaea obtain energy by producing methane from carbon dioxide or organic substrates in anaerobic niches.

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Study B4.2.7—Diversity in archaea conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL B4.2.7 Diversity in Archaea Questions question 1

[Maximum number: 1]

One method used by microbiologists to distinguish between Archaea and Eubacteria is the conditions they need for survival. Both groups include thermophiles, which are species that are adapted to live at high temperatures. The graph shows the optimum temperature and minimum pH required for growth by selected species of Archaea and thermophilic Eubacteria.

Figure for Question IB Biology HL B4.2.7 Diversity in Archaea Questions question 1 — IB Biology HL

State a possible habitat for methanogenic Archaea.

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