Which statement regarding Energy is correct ?

  1.  Energy flow in the biosphere ecosystem unidirectional.
  2.  Energy flow in the biosphere ecosystem is cyclic.
  3.  Relative loss of energy in natural ecosystem decrease with  increasing trophic levels.
  4.  Species at progressively higher tropic levels appear to be less  efficient in using available energy.
Harsh Vardhan Professor Asked on 11th May 2015 in Science.
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    Energy flows in the biosphere ecosystem unidirectional.

    The Flow of Energy in the Ecosystem is Unidirectional. The energy enters the plants (from the sun) through photosynthesis during the making of food. This energy is then passed on from one organism to another in a food chain.

    Energy given out by the organisms as heat is lost to the environment, it does not return to be used by the plants again. This makes the flow of energy in ecosystem ‘unidirectional’. Thus, the flow of energy in the ecosystem is said to be unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis.


    Harsh Vardhan Professor Answered on 12th May 2015.
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