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Q.

Water bloom is generally caused by 

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a

Bacteria.

b

Blue-green algae.

c

Hydrilla.

d

Green algae.

answer is B.

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Detailed Solution

 

  • Water bloom or algal bloom is the phenomenon in which there is a rapid increase in the algal girth in the water body due to which the color of the water changes. 
  • Thai rapid growth is promoted by cyanobacteria which is also known as blue-green algae.
  • The increase in the amount of algae in the water bodies can decrease the oxygen concentration in the water.
  •  This happens because the algal growth takes up the oxygen dissolved in water. 
  • As a result of this the plants and animals that live in the water bodies do not get enough oxygen to survive.
  • Hence the correct option is B.
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