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Human Reproduction — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Reproduction1 Mark
MCQ
The only human system that is derived from all the three germ layers is:
  • ✓
    Digestive system
  • B
    Excretory system
  • C
    Respiratory system
  • D
    Nervous system
✓

Answer

Correct option: A.
Digestive system
The digestive system is derived from three germinal layers: mesoderm, endoderm, ectoderm.
Mesoderm gives rise to the connective tissue, including the wall of the gut tube and the smooth muscle.
Endoderm is the source of the epithelial lining of the gastrointestinal tract, liver, gallbladder, pancreas.
The ectoderm is the source of the epidermis, the lens of eyes, nails, hair, brain, spinal cord, neurons of the $GI$ tract.
The excretory system is derived from the mesoderm.
The respiratory system is derived from the endoderm.
The nervous system is derived from the ectoderm.

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