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IB Biology SL 4.2.7 Energy sources Question Bank

Practise IB Biology SL 4.2.7 by explaining how photosynthesis and inorganic oxidation supply energy to different organisms.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain photosynthesis as the energy-acquisition process of photoautotrophs.
  • Distinguish photoautotrophs from chemoautotrophs by their external energy source.

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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