Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2009ZoologyMicrobes in Human WelfareActual

Biochemical Oxygen Demand (BOD) in a river water

Options

  1. Aremains unchanged when algal bloom occurs
  2. Bhas no relationship with concentration of oxygen in the water
  3. Cgives a measure of Salmonetla in the water
  4. Dincreases when sewage gets mixed with river water

Correct answer

D. increases when sewage gets mixed with river water

Step-by-step solution

Biochemical Oxygen Demand (BOD) is the amount of oxygen used for biochemical oxidation by micro-organisms in a unit volume of water. Polluted water has high BOD. Thus, when sewage gets mixed with river water, BOD will increase.

Practice Microbes in Human Welfare on Quantrex Academy →

More from Microbes in Human Welfare

What is the reason behind production of large holes in 'Swiss Cheese' ? 2026Match List I with List II : List I (Bioactive molecules) List II (Importance) A. Streptokinase I. Immunosuppressive agent B. Statins II. Removal of clots from the blood vessels C. 2026Which of the following is used as a clot buster ? 2026Which of the following is an example of non-distilled alcoholic beverage produced by yeast? 2025Which 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: 2025Which of the following microbes is NOT involved in the preparation of household products? A. Aspergillus niger B. Lactobacillus C. Trichoderma polysporum D. Saccharomyces cerevisia 2025Streptokinase produced by bacterium Streptococcus is used for 2025Match List-I with List-II relating to microbes and their products: array |l|l|r|l| & array l List-I (Microbes) array & & array l List-II (Products) array A. & Streptococcus & I. & 2024 Full Microbes in Human Welfare list All NEET PYQs