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IB Biology SL C4.2.21 Dependence Between Respiration and Photosynthesis Questions

Photosynthesis supplies atmospheric O₂ used in aerobic respiration. Respiration supplies CO₂ used by photosynthesis, linking autotrophs and heterotrophs.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Interpret plant CO₂-exchange data across light intensities to identify when respiration exceeds photosynthesis.

IB Biology SL C4.2.21 Dependence Between Respiration and Photosynthesis Questions question 1

[Maximum number: 1]

Plants produce carbon dioxide in respiration and use carbon dioxide in photosynthesis. The graph shows the volume of carbon dioxide exchanged in a plant at different light intensities.

Figure for Question IB Biology SL C4.2.21 Dependence Between Respiration and Photosynthesis Questions question 1 — IB Biology SL

What is shown by the graph?

A

There is no photosynthesis between W and X .

B

There is no photosynthesis between Y and Z .

C

There is more respiration than photosynthesis between Y and Z .

D

There is more respiration than photosynthesis between W and X .

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