EVERYDAY SCIENCE

SCIENCE

ZOOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The “jello” layer of the cnidaria which is between the epidermis and the gastro tissues.
A
ectoderm
B
enteron
C
endoderm
D
mesoglea
Explanation: 

Detailed explanation-1: -The jellylike material between the two layers is called the mesoglea. All of these body layers surround a central cavity called the gastrovascular cavity, which extends into the hollow tentacles (Fig. 3.24). Figure 3.24 demonstrates the anatomy of the main cnidarian forms.

Detailed explanation-2: -There are two tissue layers: the epidermis, which lines the outside of the animal, and the gastrodermis, which lines the inside of the animal. These layers are separated by a nonliving layer of elastic, gelatinous material known as the mesoglea, which provides structure and buoyancy without metabolic cost.

Detailed explanation-3: -Phylum Cnidaria The internal epithelium or gastrodermis is separated from the outer epidermis by a middle layer, the mesoglea. The mesoglea is a gelatinous, noncellular connective tissue layer.

Detailed explanation-4: -In jellyfish, the mesoglea is an extracellular substance situated between the epidermal and endodermal layers. It is a highly hydrated fibrous substance containing mucopolysaccharides (6), collagen fibrils (6–10), microfibrils rich in protein homologous to mammalian fibrillins (11), and other structural proteins.

Detailed explanation-5: -Cnidarians are among the simplest living metazoans and evolved approximately 700 million years ago. They consist of two body layers derived from the endoderm (gastrodermis) and ectoderm (epidermis) of the embryo. Between these two cellular layers is an amorphous, jelly-like mesoglea connective layer.

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