Choose the correct statement.
Show Hint
- Excessive nutrient inputs to lakes maintains the high dissolved oxygen of the lakes.
- Lakes with extensive algal blooms will have the good health of the lakes.
- Eutrophic lakes have high BOD.
- Oligotrophic lakes have high BOD compared to eutrophic lakes.
The Correct Option is C
Solution and Explanation
Step 1: Analyze statement A.
Excessive nutrient inputs (eutrophication) cause massive algal blooms. When these algae die, they are decomposed by bacteria, a process that consumes large amounts of dissolved oxygen, leading to hypoxia or anoxia (low or no oxygen). Thus, the statement is incorrect.
Step 2: Analyze statement B.
Extensive algal blooms are a primary symptom of eutrophication, which is a state of poor ecological health for a lake, often leading to fish kills and loss of biodiversity. Thus, the statement is incorrect.
Step 3: Analyze statement C.
Eutrophic lakes are rich in nutrients and have high biological productivity. This leads to a large amount of organic matter (dead algae, etc.) that needs to be decomposed. This decomposition requires a lot of oxygen, meaning the lake has a high Biochemical Oxygen Demand (BOD). This statement is correct.
Step 4: Analyze statement D.
Oligotrophic lakes are nutrient-poor and have low biological productivity. There is little organic matter to decompose, so they have a very low BOD. The statement claims they have high BOD compared to eutrophic lakes, which is the exact opposite of the truth. Thus, the statement is incorrect.
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