Question

bones of vertebrates are derived from embryonic
a.ectoderm
b.mesoderm
c.endoderm
d.epiderm​

Answer 1

Explanation:

When the early embryo consists of only two tissue layers, ectoderm and endoderm, a longitudinal thickening appears as the result of multiplication of the ectodermal cells. This thickening, the primitive streak, gives rise to the notochord and to the third basic layer, the mesoderm.

Answer 2

Answer:

The correct answer is b. Mesoderm. The bones of the vertebrate are formed by the mesenchymal cells of the mesoderm.

Explanation:

The bones of vertebrates are derived from the embryonic mesoderm layer. Mesoderm is the middle layer of the three germ layers that develop during gastrulation in most animals during the very early development of the embryo. The inner layer is the endoderm and the outer layer is the ectoderm, and the mesoderm derives tissues. The mesoderm forms mesothelium, coelomocytes, mesenchyma, and non-epithelial blood cells. The bones of the vertebrate are formed by the mesenchymal cells of the mesoderm. The mesenchymal cells or stem cells help in the regeneration of the skeletal tissue of the cartilage and bone. These cells are produced from the mesodermal layer and present in the bone marrow.

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