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IB Biology SL B4.2.3 Photosynthesis As Nutrition Mode Questions

Explore how photoautotrophs use light and inorganic carbon to make organic molecules, and how early cyanobacteria helped create an oxygen-rich atmosphere in IB Biology SL B4.2.3.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Distinguish photoautotrophic nutrition from heterotrophic nutrition by identifying light energy and inorganic carbon as inputs for making organic molecules.
  • Explain that photosynthetic bacteria or cyanobacteria use photosynthesis to release oxygen, contributing to the early oxygen-rich atmosphere.

IB Biology SL B4.2.3 Photosynthesis As Nutrition Mode Questions question 1

[Maximum number: 3]

There is evidence that prokaryotes were responsible for changes in the atmospheric gases 3.5 billion years ago. Outline the role of bacteria in producing an oxygen-rich atmosphere.

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