Answer
Verified
430.2k+ views
Hint: DO are dissolved oxygen and BOD are biochemical oxygen are certain parameters by which one can find out the degree of water pollution or the concentration of readily biodegradable organic matter in the water bodies.
Complete answer:
DO or dissolved oxygen is the amount of oxygen dissolved in water bodies and it is usually measured in parts per million or ppm. The amount of dissolved oxygen used up by aerobic microorganisms to decompose the organic matters present in a sample of water is termed Biochemical Oxygen Demand or Biological Oxygen Demand (BOD). BOD and DO are inversely proportional to each other i.e a decline in DO levels reflects a high level of BOD.
Additional Information:
-BOD test evaluates the dissolved oxygen used up by aerobic microorganisms over a 5-days period at 20℃. BOD concentration of wastewater is expressed in mg/L. BOD of clean freshwater is 2mg/L whereas a value exceeding 5 mg/L indicates contamination.
- Since aerobic microorganisms live by decomposing organic matters, the amount of oxygen used is proportional to their number and metabolic rate. Thus, the more the number of organisms in the water body, the more would be the requirement of dissolved oxygen or DO in the water body.
-DO is influenced by various factors such as temperature and type of water body. A river that is continuously streaming dissolves more oxygen than a still water body like ponds, reservoirs, etc. Also, cold water can hold more oxygen than a warm water body.
So, the correct answer is ‘Are inversely proportional.’
Note: Sewage water with its high concentration of organic matter increases the BOD of the water body significantly. This is due to the requirement of more aerobic bacteria to decompose the organic matter. The abnormal increase of aerobic microbial activity causes a shortage of dissolved oxygen for other aquatic species like fishes and they ultimately die.
Complete answer:
DO or dissolved oxygen is the amount of oxygen dissolved in water bodies and it is usually measured in parts per million or ppm. The amount of dissolved oxygen used up by aerobic microorganisms to decompose the organic matters present in a sample of water is termed Biochemical Oxygen Demand or Biological Oxygen Demand (BOD). BOD and DO are inversely proportional to each other i.e a decline in DO levels reflects a high level of BOD.
Additional Information:
-BOD test evaluates the dissolved oxygen used up by aerobic microorganisms over a 5-days period at 20℃. BOD concentration of wastewater is expressed in mg/L. BOD of clean freshwater is 2mg/L whereas a value exceeding 5 mg/L indicates contamination.
- Since aerobic microorganisms live by decomposing organic matters, the amount of oxygen used is proportional to their number and metabolic rate. Thus, the more the number of organisms in the water body, the more would be the requirement of dissolved oxygen or DO in the water body.
-DO is influenced by various factors such as temperature and type of water body. A river that is continuously streaming dissolves more oxygen than a still water body like ponds, reservoirs, etc. Also, cold water can hold more oxygen than a warm water body.
So, the correct answer is ‘Are inversely proportional.’
Note: Sewage water with its high concentration of organic matter increases the BOD of the water body significantly. This is due to the requirement of more aerobic bacteria to decompose the organic matter. The abnormal increase of aerobic microbial activity causes a shortage of dissolved oxygen for other aquatic species like fishes and they ultimately die.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
In Indian rupees 1 trillion is equal to how many c class 8 maths CBSE
Which are the Top 10 Largest Countries of the World?
How do you graph the function fx 4x class 9 maths CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Why is there a time difference of about 5 hours between class 10 social science CBSE