Oxygen is used in a lower amount during transpiration because transpiration is primarily a physical process involving the loss of water vapor from plant leaves through stomata, rather than a chemical process that consumes oxygen. Oxygen plays a more significant role in respiration, where it is used to break down sugars for energy. During transpiration, the main function is water movement and cooling, and while oxygen is released as a byproduct of photosynthesis, it is not significantly consumed in the transpiration process.
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