Notes for C4.2.21 Dependence of aerobic respiration on atmospheric oxygen produced by photosynthesis - IB | RevisionDojo
C4.2.21 Dependence of aerobic respiration on atmospheric oxygen produced by photosynthesis Notes
The Role of Photosynthesis in Producing Oxygen
A key step in photosynthesis is the release of oxygen, which occurs during photolysis in the light-dependent reactions.
Oxygen is produced when water molecules are split using light energy, catalyzed by the oxygen-evolving complex in photosystem II.
Tip
Photosystem II is where oxygen is released during photosynthesis.
This process enabled the evolution of aerobic life billions of years ago.
Aerobic Respiration Depends on Photosynthesis
Oxygen in the atmosphere is continually replenished by photosynthesizing autotrophs, making it available for aerobic respiration.
Without photosynthesis, atmospheric oxygen levels would drop, making aerobic respiration unsustainable for heterotrophs.
Photosynthesis Relies on Carbon Dioxide from Respiration
Respiration by heterotrophs releases carbon dioxide, which autotrophs absorb and use in the Calvin cycle to synthesize glucose.
Without this constant supply of carbon dioxide, the rate of photosynthesis would decline, as carbon dioxide is often a limiting factor for photosynthesis.
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Question 1
Recap question
Observed stable atmospheric concentrations of CO₂ and O₂ over decades suggest what about global gross photosynthesis (P) and respiration (R) rates?
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Note
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy stored in glucose. A crucial byproduct of this process is oxygen, which is released into the atmosphere.
The oxygen we breathe originates from the splitting of water molecules during photosynthesis
This process occurs in the chloroplasts of plant cells
Oxygen production is a byproduct, not the main goal of photosynthesis
DefinitionPhotolysisThe splitting of water molecules using light energy during photosynthesis, releasing oxygen
AnalogyThink of photosynthesis like a factory assembly line where water is broken apart to build glucose, and oxygen is like the packaging material that gets discarded into the air.
ExampleWhen you see bubbles forming on underwater plant leaves, that's oxygen being released through photosynthesis!
