Question

Sewage from the nearby town was dumped into the sea. Which among the given conditions

would happen in the above ecosystem after mixing of sewage into the water?

i) Biochemical oxygen demand (BOD) of receiving water body increases.

ii) Dissolved oxygen of receiving water body increases.

iii) It will cause mortality among fish and other aquatic creatures

iv) It will lead to nutrient enrichment of receiving waterbody​

Answer 1

Answer:

iii) It will cause mortality among fish and other aquatic creatures. This is the correct answer

Answer 2

Answer:

It will cause mortality among fish and other aquatic creatures

option C is correct answer.

Explanation:

• 'When sewage is released into rivers, it contains a lot of nitrogen and phosphorous. These can stimulate the growth of algae, such as phytoplankton in the water or mats known as biofilms in the sediments, which can lead to algal blooms.
• Wastewater discharge contain several harmful substances or chemicals, which may cause adverse environmental impacts such as changes in aquatic habitats, species composition, and decrease in biodiversity.
• To prevent sewage backing up into people's homes and businesses as a result, water companies discharge the excess water into waterways like the sea via sewage pipes. The problem is, this also releases raw sewage and untreated waste
• Sewage and wastewater contain bacteria, fungi, parasites, and viruses that can cause intestinal, lung, and other infections. Bacteria may cause diarrhea, fever, cramps, and sometimes vomiting, headache, weakness, or loss of appetite.

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