NEET Biology question

Not in NEET syllabus

When domestic sewage mixes with river water **[AIPMT 2010]**

(A)Small animals like rats will die after drinking river water
(B)The increased microbial activity releases micronutrients such as iron
(C)The increased microbial activity uses up dissolved oxygenCorrect
(D)The river water is still suitable for drinking as impurities are only about 0.1%

Answer: (C)

Solution

Domestic sewage introduces large amounts of biodegradable organic matter into the river, and the resulting surge in microbial decomposition activity consumes large quantities of dissolved oxygen (raising BOD),

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-130210