Question

Of the total incident solar radiation the proportion of PAR is

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

Answer 1

The correct option is D Less then 50%

Source of energy in an ecosystem is solar energy. 50 per cent of the solar energy incident over Earth is present in PAR (photosynthetically active radiation). Almost 1 to 5 percent of incident solar energy or 2 to 10 percent of PAR is captured by photosynthetic organisms in synthesis of organic matter.

So, the correct answer is 'Less then 50%'