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IB Biology HL 4.2.7 Energy sources Question Bank

Practise IB Biology HL 4.2.7 by analysing how chemoautotrophs obtain energy by oxidising simple inorganic substances.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse oxidation of simple inorganic substances as an energy source for chemoautotrophs.
  • Evaluate how photoautotrophic and chemoautotrophic pathways introduce energy into ecosystems.

C4.2.7—Energy sources question 1

[Maximum number: 1]

What is the energy source of photoautotrophs and chemoautotrophs?

A

They both use light only.

B

They both use oxidation reactions only as an external energy source.

C

Photoautotrophs use oxidation reactions, while chemoautotrophs use light.

D

Photoautotrophs use light, while chemoautotrophs use oxidation reactions.

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