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13 February, 01:39

Net production efficiency (NPE) is defined as the product of 100 and the quotient of net consumer productivity and assimilation. If the invertebrate primary consumers of an ecosystem exhibit a NPE of about 20% and pass on about 1000 kcal/m2/yr to secondary consumers, what is the assimilation of the primary consumers?

A. 1000 kcal/m2/yrB. 2000 kcal/m2/yrC. 5000 kcal/m2/yr

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  1. 13 February, 03:36
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    The assimilation of the primary consumer is 5000 kcal/m2/yr, option C.

    Explanation:

    From the information in the question, the Net Production Efficiency, NPE can be calculated using 100Cp/AS.

    Where CP is the consumer productivity and AS is the Assimilation.

    Therefore, 20 = 100 x 1000/AS

    AS = 100,000/20 = 5000 kcal/m2/yr. Option C.
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