IB Biology HL C4.2.7 Energy Sources Topic Practice

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Study C4.2.7—Energy sources conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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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