Exams › NEET › Biology

A river/ lake with an inflow of domestic sewage rich in organic waste may result in

1. Death of fish due to lack of oxygen
2. Drying of the river/ake very soon due to algal bloom
3. Increase population of aquatic food web organisms
4. An increased production of fish due to biodegradable nutrients

Correct answer: Death of fish due to lack of oxygen

Solution

Domestic sewage rich in organic matter increases the load of biodegradable waste. Decomposer bacteria use up dissolved oxygen while breaking it down, causing oxygen depletion that can kill fish.

Related NEET Biology questions

• What are the components of the common food chain of a pond ecosystem?
• Which of the following pairs is a sedimentary type of biogeochemical cycle?
• In an ecosystem, which one shows one-way passage
• The main role of bacteria in the carbon cycle involves
• A very efficient converter of solar energy with net productivity of 2-4 kg/m² or more is the crop of
• Presence of plants arranged into well-defined vertical layers depending on their height can be seen best in:

⚔️ Practice NEET Biology free + battle 1v1 →