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Correct Answer : Aqueduct
Explanation : A body of permeable rock which can contain or transmit groundwater is called aquifer. A small duct in the body of fluids is called an aqueduct. The canal is an artificial tubular duct for the inland waterways.
Correct Answer : Option (B) : Eutrophication
Explanation : Eutrophication is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of water quality. The untreated wastewater is rich in organic matter which demands oxygen.
Correct Answer : Option (C) : 20°C
Correct Answer : Option (D) : All of the above