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

1. about 70%
2. about 60%
3. less than 50%
4. more than 80%

Correct answer: less than 50%

Solution

Photosynthetically active radiation (PAR) covers only the 400–700 nm range, while total incident solar radiation includes much more infrared and some ultraviolet. Because those non-PAR portions are large, PAR is less than 50% of the total.

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