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IB Biology HL B4.2.7 Diversity in Archaea Questions

Compare light and chemical energy sources with archaeal carbon use, then explore methanogen activity in anaerobic niches in IB Biology HL B4.2.7.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Compare chemoautotrophs, photoheterotrophs and chemoheterotrophs by energy and carbon sources.
  • Explain methane production from biomass by methanogenic Archaea in anaerobic fermenters.
  • Outline how methanogenic Archaea transfer carbon from biomass into methane in ecosystems.

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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