A) Annelids
B) Mollusca
C) Arthropoda
D) All of these
Correct Answer: A
Solution :
The alimentary canal in Annelida is straight with anterior mouth and posterior anus. Due to spacious fluid filled body cavity between body wall and alimentary canal the body grossly appears like a "tube within a tube" in section. In Mollusca, the coelom is reduced, restricted to pericardial cavity and to small spaces within excretory and reproductive organs. The coelom in Arthropoda, is reduced to small cavities in excretory and reproductive organs replaced elsewhere by blood sinuses which merge together to form a large perivisceral cavity the haemocoel around viscera.
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