The instrument used for measuring photosynthetically active radiation (PAR) is
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Remember that photosynthesis is a quantum reaction, meaning plants respond to the number of photons rather than total energy.
Therefore, PAR is measured in units of \(\mu\text{mol}\cdot\text{m}^{-2}\cdot\text{s}^{-1}\) using a quantum sensor equipped with a bandpass filter for the 400--700 nm range.