Consider the following statements regarding the ecosystem which helps in reducing the level of pollution in the atmosphere.
$1$ . Ecosystems and ecological processes play an important role in maintenance of gaseous composition of the atmosphere, breakdown of wastes and removal of pollutants.
$2$ . Some ecosystems, especially wetlands have the ability to breaking down and absorb pollutants.
$3$ . Natural and artificial wetlands are being used to filter effluents to remove nutrients, heavy metals, suspended solids; reduce the BOD (Biological Oxygen Demand) and destroy harmful micro-organisms.
Which of the statements given is/are correct?

1

only

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1

and

2

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2

and

3

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All of the above

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Solution

The correct option is D All of the above
Ecosystems and ecological processes play an important role in the maintenance of gaseous composition of the atmosphere, breakdown of wastes and removal of pollutants. Some ecosystems, especially wetlands have the ability to breaking down and absorb pollutants. Constructed wetlands are a sanitation technology that has not typically been designed for pathogen removal, but instead, have been designed to remove other water quality constituents such as suspended solids, organic matter (BOD/COD) and nutrients (nitrogen and phosphorus). Thus, all of these statements are true.

So the correct option is 'All of the above'.

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