Question

What is present in mesoglea of ctenophores which makes it a loose layer of cells?
A. Amoebocytes
B. Elastic cells
C. Nerve cells and muscle cells
D. All of the above

Answer 1

Hint: Mesoglea is the loose layer. It is present in most of the ctenophores. Elasticity of the cells helps them reshape their body. They also show phagocytic activity. Cnidarians and ctenophora contain nerve and bundle fibers.

Complete answer:
Ctenophores include jelly fishes. The mesoglea is the tissue mostly found in water. It is mostly found in the hydrostatic skeleton of jellyfishes. It includes fibrous proteins, like collagen and heparan sulphate proteoglycans. It is mostly acellular. Cnidaria and ctenophora contain bundles and nerve fibers. The amoebocytes present in it also fight infections by producing antibacterial chemicals. It supports the body skeleton. The elastic property of this layer helps the organisms to restore their shape after it is deformed by the contraction of muscles.
Mesoglea is the loose layer of jelly-like substance in the Ctenophores. It is composed of muscle bundles and nerve fibers. It is found under the epithelial cells. They are hydrostatic. It contains the elastic cells along with the amoebocytes that have a role in phagocytosis.
From the above information we have found that all the above questions given in the question are correct.

Hence, the correct answer is option (D).

Note: The flattening or even collapsing of the coelenterates occur when they are taken out of the water because the mesoglea are not stiff enough to bear the weight of the body. mesohyl cells are related but distinct from mesoglea. Mesohyl tissues are found in sponges. It provides them with a jelly appearance.