Of the total incident solar radiation the proportion of PAR is
Correct answer: C. less than 50%
- A. about 70%
- B. about 60%
- C. less than 50%
- D. more than 80%.
Explanation
The source of energy in all ecosystem is solar energy. About 50% of the solar energy incident over earth is present in PAR (Photosynthetically active radiation). About 1-5% of incident solar radiation or 2 - 10% of PAR is captured by the photosynthetic organisms in the synthesis of organic matter (gross primary productivity). Roughly 20% of it is consumed in respiration so that net capture of energy (net primary productivity) is 0.8 - 4% of incident radiation or 1.6 - 8% of PAR.
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Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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