HomeTestsSearchRankProfile
easyMCQBiologyBiology
1 mark

Biochemical Oxygen Demand () in a river water:

  1. A
    has no relationship with concentration of oxygen in the water.
  2. B
    gives a measure of salmonella in the water.
  3. C
    increases when sewage gets mixed with river water.
  4. D
    remains unchanged when algal bloom occurs.

Solution & Step-by-step Explanation

is the amount of oxygen required by bacteria to decompose the organic matter in a sample of water. When sewage (rich in organic matter) enters a river, microbial activity increases, leading to an increase in .

Practice this question

Try it yourself before checking the explanation above.

Biochemical Oxygen Demand () in a river water:
A
has no relationship with concentration of oxygen in the water.
B
gives a measure of salmonella in the water.
C
increases when sewage gets mixed with river water.
D
remains unchanged when algal bloom occurs.

Share This Question

Environmental IssuesWater PollutionBOD

Related Questions

mediumMCQ

The main organelle involved in modification and routing of newly synthesized proteins to their destinations is :

mediumMCQ

There are two opposing views about origin of Modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variations of DNA however suggested African origin of Modern man. What kind of observation on DNA variation could suggest this ?

easyMCQ

The world's highly prized wool yielding 'Pashmina' breed is :

mediumMCQ

Grey crescent is the area :

mediumMCQ

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because :

easyMCQ

At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell ?

Ready for a Full Test?

Practice with timed mock tests and track your performance across Biology.

Browse TestsLeaderboard

Discussion