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achiever bio question

Discussion in 'DAT Discussions' started by msu08, Dec 28, 2008.

  1. msu08

    7+ Year Member

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    The ecological efficiency is only 5% from one trophic level to the next. For every 250 J of energy required by the secondary consumers, what is the minimum amount of energy the primary producers will have to generate?



    A. 500 J
    B. 5,000 J
    C. 10,000 J
    D. 100,000 J
    E. 200,000 J

    answer is D, they did 250/(.05)^2=100,000 J can anyone explain this? thanks!
     
  2. Danny289

    Danny289 Member
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    Primary producer ---------> first consumer--------> second counsumer
    start backward you need 250 in Secondary with 5% (0.05) efficiacy
    (X )0.05= 250
    X=5000 you need in your primary consumar
    (X)0.05=5000
    X=100000 what you need in your primary producer or you approach this way:
    (X)(0.05)^2=250
    X= 100000
     

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