Question

Percentage of total water found as freshwater is
(a) ${ 46 }$%
(b) ${ 32 }$%
(C) ${ 16 }$%
(d) ${ 2.5 }$%

Answer 1

Hint: For the survival of all living organisms this is very much essential and it must be preserved to make it available to be used by our future generations because very small percentage of it is available for the use by living organisms.

Correct answer:
${ 2.5 }$% of total water is found as freshwater on earth. ${ 71 }$% of earth's surface is covered by water mostly in seas and ocean. From the available fresh water, ${ 70 }$% is used by the humans that goes to agriculture, only ${ 1 }$% is available to be consumed by living organisms, and the rest of ${ 1.5 }$% is
present in the form of glaciers and snow in polar regions and also in the mountains like the Himalayas.

Additional Information:
-Water with less than 500 parts per million (ppm) of dissolved salts is called freshwater.
-Fresh water is having low concentrations of dissolved salts including other dissolved solids.
-Water present in the form of ice sheets, ice caps, glaciers, icebergs, bogs, ponds, lakes, rivers, streams, and even underground water is included under freshwater.
-Most of the freshwater available is not portable and to a substantial degree unsuitable for human consumption without any treatment
-The precipitation from the atmosphere, in the form of mist, rain and snow is the main source of freshwater on earth.
-For aquatic organisms a hypotonic environment is created by freshwater, which may create problems for organisms with gills or previous skins because their cell membranes may burst if excess water is not excreted.
-The quality of fresh water has become very toxic and it creates certain diseases or even birth defects, this is because of the lack of sewage and waste treatment.

So, the correct answer is,'${ 2.5 }$%'

Note:
-The potable water is water which is safe for drinking.
-Because of many naturally occurring processes, such as erosion the freshwater becomes polluted easily.
-Human beings use water for various purposes such as agricultural, industrial, household, recreational and environmental activities.