Ncert Exercises & Solutions

Approximately how much of the solar energy that falls on the leaves of the plant is converted to chemical energy by photosynthesis?

1. Less than 1%

2. 2-10%

3. 30%

4. 50%

Ans. (b) Sun is the ultimate source of energy in al ecosystems except for deep hydrothermal ecosystems. Of the incident, solar radiation (less than 50% Is Photosynthetically Active Radiation (PAR)) and about 2-10% or 1-5% of solar incident energy is captured by the autotrophs and is converted to chemical energy by the process of photosynthesis.
Page 245, XII NCERT

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