Which of the following statements about eutrophication is/are correct? 1. Eutrophication takes place in young lakes when the water is cold and clear. 2. Eutrophication is caused by nutrient enrichment in water bodies. Select the answer using the code given below.
2 only
Statement 1: Cold, clear water with low nutrient content describes an oligotrophic (young, nutrient-poor) lake, which is the opposite of eutrophication. Eutrophication is instead associated with nutrient-rich, often warmer and algae-choked water bodies. This statement is incorrect.
Statement 2: Eutrophication is the process by which a water body becomes excessively enriched with nutrients, especially nitrogen and phosphorus (often from agricultural runoff and sewage), leading to excessive algal and plant growth and subsequent oxygen depletion. This statement is correct.
Hence, the answer is 2 only.
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