A) all mesodermal
B) all endodermal
C) ectodermal and mesodennal
D) mesodermal and endodermal
Correct Answer: A
Solution :
Embryonic cells differentiate 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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