With increase in temperature, the dissolved oxygen content in a water body will:
decreases
The amount of oxygen that can remain dissolved in water is governed by the physical principle that the solubility of a gas in a liquid decreases as the temperature of the liquid rises. Therefore, with an increase in temperature, the dissolved oxygen (DO) content of a water body decreases. Warmer water holds less oxygen; additionally, higher temperatures speed up the metabolic and respiratory activity of aquatic organisms and microbial decomposition, which consumes oxygen faster and lowers DO still further. This is why thermal pollution from industrial discharge is harmful to aquatic life.
The correct response is that dissolved oxygen decreases.
The option that DO increases is wrong because gas solubility falls, not rises, with temperature. The option that it remains constant is incorrect because DO is clearly temperature-dependent and does change. The option that it may increase or decrease depending on the temperature range is wrong because the relationship is consistently inverse across the normal range of natural water temperatures: as temperature goes up, dissolved oxygen goes down.
Correct answer: decreases
Similar Questions
Give below are two statements:
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Statement II : Humans also cause thermal pollution by altering vegetation cover and run-off patterns.
In the light of the above statements, choose the correct answer from the options given below:
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(b) Food processing
(c) Ore mining
(d) Sewage effluent
(e) Landfill sites
Choose the correct option from those given below: -
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Which of the following pollutants is the major cause of respiratory diseases?
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Reason (R): In winters, a lot of biomass is burnt by people for heating purposes or to keep themselves warm.
Choose the correct answer from the code given below:
In the formation of Surface Ozone, which of the following do play an important role?
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Important Questions from Pollution
Which of the following isnota common component of photo-chemical smog?
Which of the following is NOT the main objective of Ganga action plan?
Which of the following pollutants causes water pollution ?
Presence of which pathogenic microbe in water is indication of contamination?
Which of the following isnota vehicular pollutant?
