Discussion
Which one of the following is observed when analyse sewage polluted water ?
Answer: D
Sewage-polluted water shows a high concentration of nutrients and excess growth of algae.
Sewage carries large amounts of nitrogen and phosphorus. These nutrients fertilise the water and cause algal blooms (eutrophication). When the algae die, bacteria decompose them and use up dissolved oxygen, so oxygen falls and fish may die.
The options pairing a low nutrient level with excess algae, or high nutrients with low algal growth, break the link between nutrients and algae. Low algal growth with less dissolved oxygen gets the oxygen right but not the algae, since sewage pollution stimulates algal growth rather than suppressing it.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development