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Why does water covered with excessive algal growth become polluted? - Chemistry

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प्रश्न

Why does water covered with excessive algal growth become polluted?

टिप्पणी लिखिए

उत्तर

Due to the excessive growth of algae water contains a lot of phosphate due to the inflow of the fertilizers from the surroundings. The decomposition of algae leads to the bad smell and taste and even makes it unfit for drinking, bathing, washing, swimming, boating etc. and concentration of dissolved oxygen also decreases which may be harmful for aquatic life. 

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Environmental Pollution - Introduction
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 14: Environmental Chemistry - Multiple Choice Questions (Type - I) [पृष्ठ १७९]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 11
अध्याय 14 Environmental Chemistry
Multiple Choice Questions (Type - I) | Q 27 | पृष्ठ १७९

संबंधित प्रश्न

Which of the following problems is caused by air pollution?


How is the use of plastic bags harmful for environmental degradation? Evaluate it by citing suitable reasons.


What are the sources of dissolved oxygen in water?


What is the importance of measuring BOD of a water body?


How can you apply green chemistry for the following:

To reduce use of synthetic detergents.


A farmer was using pesticides on his farm. He used the produce of his farm as food for rearing fishes. He was told that fishes were not fit for human consumption because large amount of pesticides had accumulated in the tissues of fishes. Explain how did this happen?


Which of these activities are the most significant contributor to water pollution?


Which of the following is the largest contributor to water pollution in India?


Which in wrong with respect to our responsibility as a human being to protect our environment?


Read the given source and answer the questions that follow: 

The main sources of noise pollution are various factories, mechanized construction and demolition Works, automobiles and aircraft, etc. There may be added periodical but polluting noise from sirens, loudspeakers used in various festivals, programmes associated with community activities. The level of steady noise is measured by sound level expressed in terms of decibels (dB).

Of all these sources, the biggest nuisance is the noise produced by traffic, because its intensity and nature depend upon factors, such as the type of aircraft, vehicle, train and the condition of road, as well as, that of vehicle (in case of automobiles). In sea traffic, the noise pollution is confined to the harbour due to loading and unloading activities being carried. Industries cause noise pollution but with varying intensity depending upon the type of industry.

Noise pollution is location specific and its intensity declines with increase in distance from the source' of pollution, i.e. industrial areas, arteries of transportation, airport, etc. Noise Pollution is hazardous in many metropolitan and big cities in India.

  1. Explain the meaning of noise pollution.
  2. Why is noise pollution hazardous in metropolitan cities in India? 
  3. "Noise pollution is location specific." Explain with argument. 

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