Question

Which of the following statement can be related to mesogloea and mesoderm?
A. Mesogloea is an undifferentiated layer is present between the ectoderm and endoderm.
B. Mesoderm is absent in triploblastic animal
C. Mesoderm is formed through the process of gastrulation.
D. All of the above.

Answer 1

Hint: Mesogloea is a tissue present in jellyfish which acts as a hydrostatic skeleton. Mesoderm is a germ layer found in animal embryos that gives rise to specialized tissue types.

Complete answer:
- A gelatinous material present in between the outer layer and inner cellular layer in jellyfish and other coelenterates and is undifferentiated is called mesogloea.
- In the early trilaminar embryo germ layers, the middle layer is formed by the mesoderm. It is present in triploblastic animals.
- During the process of gastrulation in birds and mammals, epiblast cells start converging at the midline and ingressing at the primary streak. Ingression leads to the formation of mesoderm.
Hence, option, ‘C. Mesoderm is formed through the process of gastrulation’ is the correct answer.

Additional information: Mesogloea is found in sponges and supports the body. It has elasticity which restores the shape of the muscle after any kind of deformity. Mesoderm forms the skeletal muscle bone, connective tissue and heart.

Note: Mesogloea is an undifferentiated layer present just between the endoderm and ectoderm whereas mesoderm is the embryonic layer found in the developing embryo in between the endoderm and ectoderm.