Effect on water bodies - dissolved oxygen (do), Biology

Assignment Help:

Effect on Water Bodies - Dissolved Oxygen (DO)

Most aquatic, organisms respire with oxygen dissolved in water. The quantity of dissolved oxygen in a unit volume of aerated water is only .0084g which is about one thirtieth of that present in the same volume of air at 25°C. The quantity decreases further with the increase of temperature. Hence the availability of oxygen is one of the critical factors for the survival of aquatic species. The amount of oxygen gas dissolved in a given quantity of water at a particular temperature and atmospheric pressure is referred to as DO and generally expressed as parts per million (ppm). DO in natural water is influenced by

  • The degree of aeration,
  • The photosynthetic activity in the water column,
  • The consumption of dissolved oxygen by plants, aquatic organisms and decomposers and
  • The ambient temperature.

Discharge of sewage in large quantities results in a drop in DO because decomposer organisms use up a lot of dissolved oxygen in decomposing organic matter. The water containing DO below 8 ppm is considered polluted. The gravely polluted water has DO below 4 ppm to nil. Volume and flow of water also affect biodegradation because consumed oxygen is rapidly renewed in large flowing water, whereas in stagnant water biodegradation is sharply reduced particularly in summer due to decrease in DO.


Related Discussions:- Effect on water bodies - dissolved oxygen (do)

Define the incubator - food microbiology, Define the Incubator - Food Micro...

Define the Incubator - Food Microbiology? The growth of the microorganisms is altered by the chemical and physical nature of its surrounding. Most important environmental featu

Illustrate about the chemical disinfection, Illustrate about the Chemical d...

Illustrate about the Chemical disinfection Sharp waste may cause injury and person may have diseases like Hepatitis B, Cand HIV/AIDS. Therefore it is important for to understa

Explain glomerular filtration in human nephrons, A horticulturist keeps Chr...

A horticulturist keeps Chrysanthemum plants in short-day conditions during long-day season. State its effect on flowering. Specify the role of phytochrome included. Explain glom

Harshey-chase experiement, What is the Harshey-chase experiement .explain i...

What is the Harshey-chase experiement .explain in detail

Determine the interphase of mitosis, Is the interphase of meiosis differen...

Is the interphase of meiosis different from the interphase of mitosis? The interphase that precedes meiosis is same to the interphase that precedes mitosis. In them the major e

Define the replication of dna strands, Which of the following is a true sta...

Which of the following is a true statement regarding the replication of DNA strands? A. The products of replication contain one double helix made exclusively of parental DNA an

What is glycolysis in cell metabolism, What is Glycolysis in Cell Metabolis...

What is Glycolysis in Cell Metabolism? Glycolysis :  is the process that breaks down glucose into pyruvate and energy. Glycolysis does not require the presence of oxygen and

Clinical features - rheumatic fever, The American Heart Association (AHA) h...

The American Heart Association (AHA) has recommended the revised Jones Criteria as a guide for ARF diagnosis. The same have been approved by WHO study group for the diagnosis of in

Determine the carbon based materials, Carbon Based Materials These incl...

Carbon Based Materials These include Pyrolytic carbon, polycrystalline (Vitreous Carbon), and carbon/silicon interstitial combination. Vitreous Carbon -Solid or porous vitre

Explain about the cancer and infertility - obesity, Explain about the Cance...

Explain about the Cancer and Infertility - Obesity? Cancer: Risk of cancers of the colon, rectum and prostrate increases greatly in obese men while obese women are more likely

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd