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Discussion :: World Environment and Ecology

  1. Of the solar energy coming into the Biosphere, what percentage of it is actually used in the photosynthesis?

  2. A.

     Less than 1

    B.

     Between 1% and 15%

    C.

     Between 15% and 2%

    D.

     More than 2%

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    Answer : Option D

    Explanation :

    More than 2% of the solar energy coming into the Biosphere is actually used in the photosynthesis. Most solar energy occurs at wavelengths unsuitable for photosynthesis. Between 98 and 99 percent of solar energy reaching the Earth is reflected from leaves and other surfaces and absorbed by other molecules, which convert it to heat. Thus, only 1 to 2 percent is available to be captured by plants.


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