Question

Excessive addition of nitrates and phosphates into water bodies cause
1 Eutrophication
2 Putrification
3 Sterilization
4 None.
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Answer 1

Explanation:

Eutrophication – “The process by which a body of water acquires a high concentration of nutrients, especially phosphates and nitrates. ... As the algae die and decompose, high levels of organic matter and the decomposing organisms deplete the water of available oxygen, causing the death of other organisms, such as fish.

Too much nitrogen and phosphorus in the water causes algae to grow faster than ecosystems can handle. Significant increases in algae harm water quality, food resources and habitats, and decrease the oxygen that fish and other aquatic life need to survive.

An overabundance of nutrients—primarily nitrogen and phosphorus—in water starts a process called eutrophication. ... When the algae die, they are decomposed by bacteria—this process consumes the oxygen dissolved in the water and needed by fish and other aquatic life to "breathe".