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Q.

It is due to the following reason, the diffusion of digested food from the lumen of the gut into the surrounding pseudocoelomic fluid becomes easier in roundworms

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a

Intestine contains thin layer of muscles

b

Gut wall is made of only endodermal epithelium

c

Mesoderm is absent in pseudocoelomates

d

Sac like gut is present in roundworms

answer is B.

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Detailed Solution

Gut wall of pseudocoelomates contains only endoderm and muscles are absent in the wall of gut.  So the diffusion is possible from lumen of gut to pseudocoelom easily. Sac like gut is the characteristic of Cnidarians and flatworms.

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