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This question is related to the question: Why are some things transparent and others opaque? Being able to see something requires that it is opaque and that sufficient light illuminates it. UV and shorter wavelengths are not as prevalent as visible light on earth. The world would appear too dark to see if we used UV and shorter wavelengths. This is ...


Not sure, this what you need, but here you can find a detailed description of how photosynthesis efficiency can be measured in the field, with a list of modern devices. In short, it's about measuring the uptake of CO2 and release of H2O of individual leaves.

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