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Dear Student

Water hyacinth replaces the native species. It also blocks the sunlight from entering the water bodies. It covers the water bodies and depletes the dissolved oxygen. It changes the water quality in terms of dissolved oxygen and pH due to increased oxygen concentration in water.
It causes desilting of water bodies by suspending particles to be precipitated. 
Hence, the correct options are i, iii, iv, v, vi,vii.

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