A) Hydra
B) Euglena
C) Snail
D) Pheretima
Correct Answer: C
Solution :
Schistosoma (blood fluke) is a digenetic parasite and lives in hepatic portal vein- mesenteric blood vessels, urinary tract blood vessels and lymphoid organs of man. Its primary host is man and secondary host is snail. The green Hydra (Chlorohydra viridissima) lives in a symbiotic relationship with the small alga Chlorella vulgaris (living within the body of Hydra). In Pheretima closed type of blood vascular system and 3 type of nephridia (septal- pharyngeal and integumentary) are found. It is a social animal (beneficial for agriculture).
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