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)

How linnaeus classify the plant kingdom, Q. How Linnaeus classify the plant...

Q. How Linnaeus classify the plant kingdom? Linnaeus classified the plant kingdom into 24 classes in his famous work 'Genera Plantarum' (1737) and 'Species Plantarum' (1753). I

Human milk composition and infant growth and development, Explain the Human...

Explain the Human Milk Composition and Infant Growth and Development? This sub-section deals with composition of human milk, compares human milk with cow's milk and why human m

Explain classification of lipids, Classification of lipids  A general c...

Classification of lipids  A general classification of lipids based on their structural components is presented in table. Such a classification, however, is possibly too rigid f

Concomitant caroid endarterectomy and cabg, Concomitant caroid endarterecto...

Concomitant caroid endarterectomy and CABG :   Symptoimatic or asymptomatic carotid artery disease may be present in patients undergoing CABG. It is very important to recognize thi

Foot as burrowing organ, Foot as Burrowing Organ The Scaphopoda that ...

Foot as Burrowing Organ The Scaphopoda that usually have burrowing habit, possess foot suitably modified for burrowing purpose. The conical and protrusible foot of Dentalium

What would the result of a haploid egg, If a diploid sperm fertilized a hap...

If a diploid sperm fertilized a haploid egg, what would the result be? a.Haploid (n) b.Diploid (2n) c.A mixture of diploid (2n) and haploid (n) d.Triploid (3n)

Indication of exchange transfusion, Indication of Exchange Transfusion ...

Indication of Exchange Transfusion i) Early exchange transfusion is indicated in the presence of hydrops and is often indicated by a history of previously severely aff

Fiehes test and aniline chloride test, Q. Fiehes test and Aniline chloride ...

Q. Fiehes test and Aniline chloride test? Determine the adulteration in the given honey sample by Fiehe's test and Aniline chloride test This activity will help you to: •

How is genetic determination of sex established in humans, How is the genet...

How is the genetic determination of sex established in humans? In the diploid genome of the human beings, there are 46 chromosomes, 44 of them are autosomes and two are sex chr

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