Multiple choice

The origin of kidney and ureter in Rana tigrina is :

  1. all mesodermal

  2. all endodermal

  3. ectodermal and mesodermal

  4. mesodermal and endodermal
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A Correct answer
Explanation

Embryonic cells differenciate at an early stage and form an outer layer of cells, the ectoderm and an inner layer the endoderm. At the later stage the mesoderm is formed and these three germ layers give rise to all the tissues of the developing embryo. Kidney and ureter in Rana Tigrina is developed from mesodermal layer. 

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