Q.

The Red tide is

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a

Massive growth of red algae of oceans and seas

b

Formation of several zygospores of algae that are rich in red pigment haematochrome.

c

Population explosion of Gonyaulax 

d

Blooms caused by cyanobacteria 

answer is C.

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Detailed Solution

Very often, red dinoflagellates (Example: Gonyaulax) undergo such rapid multiplication that they make the sea appear red (red tides). Toxins released by such large numbers may even kill other marine animals such as fishes.

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The Red tide is