Identify the protozoan which is not free living among the following.

Euglena

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Amoeba

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Giardia

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Noctiluca

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Solution

The correct option is C Giardia
Free living organisms are not dependent on any other organism for survival. Giardia is a parasite that depends on host organisms for their survival. It is commonly nicknamed as 'Grand Old Man of Intestine'. It is found in the human small intestine. Infection occurs by entry of cysts of the parasite through food and water.

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