Question

5. An undifferentiated layer, mesoglea, is present in between ectoderm and endoderm in which of the following
organisms
1) Coelenterata
2) Protozoa
3) Ctenophora
4) All the above​

Answer 1

Answer:

coelenterata/cnidaria

Explanation:

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Answer 2

Answer:

Mesoglea is found in diploblastic organisms such as Coelenterata and Ctenophora, thus answers $1$ and $3$ are correct.

Explanation:

The mesoglea is a layer of gelatinous, noncellular connective tissue.

The mesoglea is primarily made up of water. Aside from water, the mesoglea is made up of a variety of components, including fibrous proteins such as collagen and heparan sulphate proteoglycans. The mesoglea is primarily acellular, however it includes muscle bundles and nerve fibers in both Coelenterata and ctenophora. Other nerve and muscle cells can be found just under the epithelial layers. Wandering amoebocytes in the mesoglea also help to phagocytoze debris and microorganisms. In addition, these cells combat infections by generating antibacterial compounds.

The mesoglea is an internal skeleton that supports the body. Its elastic characteristics aid in the restoration of shape after it has been distorted by muscular contraction. However, without such buoyancy of water to sustain it, the mesoglea is not rigid enough to sustain the weight of the body, and coelenterates often flatten out or collapse when removed from water.