Question

Select the correct pair of the germ layer and structure arises from it.
I. Femur
II. Brainstem
III. Lungs
A. I = endoderm; II = ectoderm; III = mesoderm
B. I = endoderm; II = mesoderm; III = ectoderm
C. I = ectoderm; II = endoderm; III = mesoderm
D. I= mesoderm; II = endoderm; III = ectoderm
E. I = mesoderm; II = ectoderm; III = endoderm

Answer 1

Hint: The endoderm layer in the embryonic stage differentiates and forms internal organs, the mesoderm differentiates to form the structure of the human body and the ectoderm differentiates into forming the outer body.

Step by step answer:Germ layers are formed during the early stage of embryonic development. There are three types of layers: endoderm, mesoderm, and ectoderm. Cells present in each layer differentiate further to form the embryo.
-The endoderm is the innermost layer in the embryo.
-The mesoderm is the middle layer in the embryo.
-The ectoderm is the outermost layer in the embryo.

-The ectoderm differentiates to form outer body parts. This includes tooth enamel, epidermis, sweat glands, anus, hair, glands, nails, the lining of the mouth, and also the nervous system.
-The mesoderm differentiates into bones of arms, forearm, hand, thigh, foot, leg, blood vessels, and connective tissues.
-The endoderm differentiates into internal organs. This includes the colon, stomach, intestines, liver, lungs, and pancreas.
So, the correct option is option E

Note: The embryonic development begins with fertilization of the egg cell and the sperm. Following fertilization, the zygote cleaves to form the blastula. The blastula then undergoes a process called gastrulation in which the three germ layers are formed.