Advertisements
Advertisements
प्रश्न
What do you mean by Biochemical Oxygen Demand (BOD)?
Define Biochemical Oxygen Demand (BOD)
उत्तर १
Biochemical oxygen demand is the amount of oxygen required by bacteria to decompose organic matter in a certain volume of sample of water. Clean water would have a BOD value of less than 5 ppm, whereas highly polluted water has a BOD value of 17 ppm or more
उत्तर २
The amount of oxygen required by bacteria to breakdown the organic matter present in a certain volume of a sample of water is called Biochemical Oxygen Demand (BOD).
उत्तर ३
BOD - Biochemical Oxygen Demand
The water pollution by organic wastes is measured in term of BOD. It is the amount of dissolved
oxygen needed by bacteria in decomposing the organic wastes present in water.
APPEARS IN
संबंधित प्रश्न
What are the major causes of water pollution? Explain.
Have you ever observed any water pollution in your area? What measures would you suggest to control it?
Clear, transparent water is always fit for drinking. Comment.
Give an account of various sources and harmful effects of water pollution.
What are natural reasons for water pollution?
Thermal power plants give out a lot of ______ waste water.
List the three major constituents of sewage.
Agricultural water pollution and Shipping water pollution.
Answer the following question:
Name two human diseases caused due to water pollution.
Give a reason why :
Polluted water causes disease.
Answer the following question in one or two paragraphs
What are the major causes of water pollution?
How could warm water act as a pollutant?
List the three major sources of water pollution
True or False:
Sources of groundwater pollution include leaking sewer lines, pumping wells, landfills, fertilizer, and sludge.
Do not throw plastic garbage when you go near beaches.
What are the pollutions caused by the objects given below?
- Loud Speaker
- Plastic
Explain the different ways by which water gets polluted.
Dissolved oxygen in water is responsible for aquatic life. What processes are responsible for the reduction in dissolved oxygen in water?
______ of the world population does not get safe drinking water.
Classify the most significant sources of water pollutants.
Why does water need conservation even though large oceans surround the landmasses?
Which of the following is not a way to conserve water?
Microplastics can be found in almost every freshwater source.
How do plastic sheets affect the soil?
Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes:
(i) enhanced growth of algae.
(ii) decrease in amount of dissolved oxygen in water.
(iii) deposition of calcium phosphate.
(iv) increase in fish population.
Industrial wastes mainly consist of chemical pollutants.
