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B
Haemocoel
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C
Pseudocoelom
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D
Schizocoel
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Solution
The correct option is B Pseudocoelom
In case of true coelomic cavity of vertebrates, the cavity is lined by mesodermal cells from both sides.
A pseudocoelom is a fluid-filled space between the body wall and the digestive tract found in roundworms. This cavity bathes the internal organs.
It is called as pseudocoelom because it is not fully lined by mesodermal cells. The cavity is derived from blastocoel rather than from a secondary cavity within the embryonic mesoderm.