Question

Of the total incident solar radiation the proportion of PAR is:

• A. More than 80%
• B. About 70%
• C. About 60%
• D. Less than 50%

Answer 1

The correct option is D Less than 50%

Photosynthetically active radiation or PAR designates the spectral range of the solar radiation from 400 - 700 nm that photosynthetic organisms are able to use in the process of photosynthesis. Out of total incident solar radiation, about 50% of it forms photosynthetically active radiation (PAR).