NEET2023BotanyEnvironmental IssuesActual
What will happen if fresh water lake gets contaminated by addition of polluted water with high BOD?
Options
- ANumber of submerged aquatic plants in the lake will increase
- BNumber of aquatic animals in the lake will increase
- CAmount of dissolved oxygen in the lake will decrease
- DThe lake will remain unaffected
Correct answer
C. Amount of dissolved oxygen in the lake will decrease
Step-by-step solution
Higher BOD of water indicates higher amount of biodegradable organic materials present in it. Since BOD is inversely proportional to the dissolved oxygen (DO), therefore, the dissolved oxygen in the lake will decrease.