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)

What is linkage, What is linkage? Two genes are assumed to be under lin...

What is linkage? Two genes are assumed to be under linkage, or linked, when they reside in the same chromosome. For instance, the research of the human genome discovered tha

Define natural disasters - public nutrition, Define Natural Disasters - Pub...

Define Natural Disasters - Public Nutrition? Disaster prone settings also shape the intensity and prevalence of food insecurity, these consist of poor who are exposed to recurr

Amino acid metabolism, All tissues have some capability for synthesis of th...

All tissues have some capability for synthesis of the non-essential amino acid remodeling, amino acids and conversion of non-amino acid carbon skeletons into amino acids and other

What is the structural depiction of a carboxyl group, Q. What is the struct...

Q. What is the structural depiction of a carboxyl group? Carboxyl groups have a carbon attached to one hydroxyl group by a simple bond and one oxygen by a double bond. The othe

Glycolipids, G L YCOLIPIDS They are lipids having sugar residues. ...

G L YCOLIPIDS They are lipids having sugar residues. Two common glycolipids are cerebrosides and gangliosides. (1) Cerebrosides They are made of amino alcohol sphi

Explain about vitamin C, Vitamin C (Ascorbic acid) Vitamin C, ascorbic ...

Vitamin C (Ascorbic acid) Vitamin C, ascorbic acid is also called anti-scorbutic vitamin. Ascorbic acid occurs as white crystals or white crystalline powder without odour and o

What is vision, What is vision? Why is vision important for life on earth? ...

What is vision? Why is vision important for life on earth? Vision is the ability of some living beings to perceive, to differentiate and to interpret luminous stimuli. Visio

Role of protein in metabolism, ROL E OF PROTEIN - Main organic comp...

ROL E OF PROTEIN - Main organic component of body. Unit is amino acid. Polymer of amino acids. Amino acids combine to each other by peptide bond. Formation of bone, t

What is signifying by concentration gradient, Q What is signifying by conce...

Q What is signifying by concentration gradient? Is it correct or not to refer to "concentration gradient of water"? Concentration gradient is the variation of concentration of

Define quantitative procedures in carbohydrates, Define Quantitative Proced...

Define Quantitative Procedures in Carbohydrates? You have learnt how to identify some individual monosaccharides, disaccharides and polysaccharides. However, if we were asked t

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