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Stuck here, help me understand: A lake which is rich in organic waste may result in

A lake which is rich in organic waste may result in

  • Option 1)

    increased population of aquatic organisms due to minerals

  • Option 2)

    drying of the lake due to algal bloom

  • Option 3)

    increased population of fish due to lots of nutrients

  • Option 4)

    mortality of fish due to lack of oxygen

 
Answers (1)
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As we learnt in

Causes of water pollution -

Eutrophication

- wherein

Rich growth of micro-organisms consumes most of the dissolved oxygen, so as to deprive other organisms. It generally occurs at the bottom layers of deep lakes. Addition of excessive plant nutrients intensifies eutrophication. It is harmful to fish and other aquatic life.

 

 

 

A lake rich in organic waste will reduce the dissolved oxygen. The organic waste will increase biological oxygen demand of the lake thus depleting the O2 content and may result in dealth of fish.


Option 1)

increased population of aquatic organisms due to minerals

Incorrect

Option 2)

drying of the lake due to algal bloom

Incorrect

Option 3)

increased population of fish due to lots of nutrients

Incorrect

Option 4)

mortality of fish due to lack of oxygen

Correct

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