Domestic sewage consists a lot of degradable organic matter. When this sewage is released into river water, it will result in an increase of Biochemical Oxygen Demand (BOD) and decrease in the amount of dissolved oxygen due to decomposing activity of microbes.
When domestic sewage mixes with river water
NEET UG 2010 — Zoology Microbes in Human Welfare
2010mcqmedium
When domestic sewage mixes with river water
Official previous-year question
Held on 30 Apr 2010 · Verified 9 Jul 2026.
Options
- 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 oxygen
- D
the river water is still suitable for drinking as impurities are only about 0.1%
Did you get this right?
Sign in to track your attempts and accuracy.
Your note
Sign in to keep a private note on this question. Nothing you write is ever public.
NEET UG Microbes in Human Welfare in other years
Microbes in Human Welfare 2025Microbes in Human Welfare 2024Microbes in Human Welfare 2022Microbes in Human Welfare 2021Microbes in Human Welfare 2020Microbes in Human Welfare 2019Microbes in Human Welfare 2018Microbes in Human Welfare 2017Microbes in Human Welfare 2016Microbes in Human Welfare 2015Microbes in Human Welfare 2014Microbes in Human Welfare 2013
More NEET UG Microbes in Human Welfare questions
Which of following organisms cannot fix nitrogen? A. Azotobacter B. Oscillatoria C. Anabaena D. Volvox E. Nostoc Choose the correct answer from the options given below:
2025easy
Which of the following is an example of non-distilled alcoholic beverage produced by yeast?
2025easy
Streptokinase produced by bacterium Streptococcus is used for
2025easy
Which of the following microbes is NOT involved in the preparation of household products? A. Aspergillus niger B. Lactobacillus C. Trichoderma polysporum D. Saccharomyces cerevisiae E. Propionibacterium sharmanii Choose the correct answer from the options given below:
2025medium
Given below are two statements: Statement I: Antibiotics are chemicals produced by microbes that kill other microbes. Statement II: Antibodies are chemicals formed in body that eliminate microbes. In the light of the above statements, choose the most appropriate answer from the options given below.
2024easy
Other Zoology topics for NEET UG
Keep practicing Microbes in Human Welfare
Work through every NEET UG Microbes in Human Welfare PYQ, year by year.