2026 · Q90
Which of the following statements about eutrophication is/are correct?
- 1Eutrophication takes place in young lakes when the water is cold and clear.
- 2Eutrophication is caused by nutrient enrichment in water bodies. Select the answer using the code given below.
general-sciencebiotech-environment-science
- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1 nor 2
Explanation
Young lakes with cold, clear water are oligotrophic (nutrient-poor); eutrophication is the ageing/enrichment process, so statement 1 is false. Eutrophication is caused by nutrient enrichment (nitrogen, phosphorus) of water bodies, leading to algal blooms and oxygen depletion — statement 2 is correct. Hence only statement 2 is correct.