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  1. Physico-chemical characteristics of water in water sources undergo changes due to

    2. A.

     Aquatic macrophytes
    B.

     Auatic fungi
    C.

     Effluents
    D.

     Evapotranspiration

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    Answer : Option C

    Explanation :

    Aquatic macrophytes, aquatic fungi are natural organism and evapotranspiration is a natural process by which plant losses water. Thus being natural they do not results into any change in physico-chemical characteristics of water while effluents discharged into water bodies by industrial units and domestic sewage results in to change in physico-chemical characteristics like pH, conductivity, temperature, electrical conductivity, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, NH4+ and NO3- ion contents etc.

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