Question

Gonads are derived from

• A. Ectoderm
• B. Mesoderm
• C. Endoderm
• D. None of the above

Answer 1

The correct option is B Mesoderm

• In all bilateral animals, three germ layers are found. These are ectoderm, mesoderm, and endoderm.
• Out of these, mesoderm is found in the early embryonic stage which forms mesenchyma, mesothelium, non-epithelial blood cells(coelomocytes). Mesothelium lines coeloms.
• The gonads (testes or ovaries) are derived from the three sources. These are$\left(i\right)$mesodermal epithelium lining the posterior abdominal wall, from lateral somatic mesoderm $\left(ii\right)$ Underlying mesenchyma, from intermediate mesoderm and $\left(iii\right)$ primordial germ cells.
  So, the correct option is B.