Coelom or body cavity, when derived from blastocoel is pseudocoelom as in nematodes, rotifers. In this type of cavity, mesoderm is lined by only one side i.e., towards the body wall. Schizocoel is true coelom derived from mesodermal segments.

Correct Option: C

Coelom or body cavity, when derived from blastocoel is pseudocoelom as in nematodes, rotifers. In this type of cavity, mesoderm is lined by only one side i.e., towards the body wall. Schizocoel is true coelom derived from mesodermal segments.

In radial symmetry – body is cut longitudinally through any radius into two equal halves. Present in sessile animals i.e. star fish that live in the sea bottom.

Correct Option: C

In radial symmetry – body is cut longitudinally through any radius into two equal halves. Present in sessile animals i.e. star fish that live in the sea bottom.

The organisms, which are attached to substratum, generally, possess radial symmetry in all vertical planes.

Correct Option: A

The organisms, which are attached to substratum, generally, possess radial symmetry in all vertical planes.

Coelom is a fluid filled space between body wall and alimentary canal which is lined by parietal peritoneum (mesoderm) on the outer side and visceral peritoneum (mesoderm) on the inner side.

Correct Option: D

Coelom is a fluid filled space between body wall and alimentary canal which is lined by parietal peritoneum (mesoderm) on the outer side and visceral peritoneum (mesoderm) on the inner side.

Coelom or body cavity, when derived from blastocoel is pseudocoelom as in nematodes, rotifers. In this type of cavity, mesoderm is lined by only one side i.e., towards the body wall. Schizocoel is true coelom derived from mesodermal segments.

Correct Option: B

Coelom or body cavity, when derived from blastocoel is pseudocoelom as in nematodes, rotifers. In this type of cavity, mesoderm is lined by only one side i.e., towards the body wall. Schizocoel is true coelom derived from mesodermal segments.