Choose the correct combination from the following with regard to the given diagram.
A B
1.
X – Pseudocoelom
Y – Enterocoelom
Ascaris, Ancylostoma
Nereis, Fasciola
2.
X – Enterocoelom
Y – Pseudocoelom
Asterias, Balanoglossus
Ascaris, Ancylostoma
3.
X – Acoelomate
Y – Pseudocoelom
Fasciola, Taenia
Nereis, Ascaris
4.
X –Schizocoelom
Y – Pseudocoelom
Nereis, Taenia
Ascaris, Fasciola

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answer is B.

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Detailed Solution

Enterocoelom is formed by the evagination (out-pouching) of mesoderm from the wall of archenteron.

These pouches get pinched off from the archenteron into the blastocoel and fuse with one another. E.g., Asterias (Echinodermata), Balanoglossus (Hemichordata)

In some animals, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm.

Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates, e.g., Ascaris, Ancylostoma (Aschelminthes).

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