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

Explain how photosynthesis supplies oxygen for aerobic respiration and respiration supplies carbon dioxide for photosynthesis across autotrophs and heterotrophs in IB Biology SL C4.2.21.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain the reciprocal gas dependence between photosynthesis and aerobic respiration: photosynthesis releases oxygen used in respiration, while respiration releases carbon dioxide used in 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. Thegraph 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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