Civil Services Kerala (കേരളം) PSC KAS Prelims Test Series 2025 General Knowledge Ecology and Environment Environment Problems
Which of the following could result in the occurrence of dead zones?
1. Eutrophication
2. Stratification of the water column
3. Upwelling
Select the correct answer using the code given below.
1
1 only
2
2 and 3 only
3
1 and 3 only
4
1, 2 and 3