How is ozone gas produced in the stratosphere?
- ABy the action of $UV$ radiation on $O_2$ molecules.
- BBy the reaction of $O_2$ with $N_2$.
- CBy the combustion of fossil fuels.
- DBy the reaction of $O_2$ with $CO_2$.
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$A$ water sample is considered the cleanest based on which of the following $BOD$ values (in $ppm$)?
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View SolutionGiven below are two statements :-
Statement $I :$ The value of the parameter "Biochemical Oxygen Demand $(BOD)$" is important for survival of aquatic life.
Statement $II :$ The optimum value of $BOD$ is $6.5 \ ppm$.
In the light of the above statements,choose the most appropriate answer from the options given below:
Statement $I :$ The value of the parameter "Biochemical Oxygen Demand $(BOD)$" is important for survival of aquatic life.
Statement $II :$ The optimum value of $BOD$ is $6.5 \ ppm$.
In the light of the above statements,choose the most appropriate answer from the options given below:
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