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IB Biology SL C4.2.7 Energy Sources Questions

Photoautotrophs use light captured by photosynthetic pigments. Chemoautotrophs use energy from oxidation of inorganic substances such as iron or sulfur compounds. In IB Biology SL C4.2.7, practise identifying these two energy sources.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify photoautotrophs as organisms that capture light with photosynthetic pigments and convert that external energy into chemical energy during photosynthesis.
  • Distinguish photoautotroph light capture from chemoautotroph oxidation of simple inorganic substances as the external energy source for carbon fixation.

IB Biology SL C4.2.7 Energy Sources Questions 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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