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STD 12 - 7. human health and disease — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 7. human health and disease1 Mark
MCQ
Physical barrier = .............. and physiological barrier = .............
  • ✓
    Skin, saliva in the mouth
  • B
    Macrophage, acid in the stomach
  • C
    Respiratory tract, $PMNL$
  • D
    Urinogenital tract, $PMNL$
✓

Answer

Correct option: A.
Skin, saliva in the mouth
a

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