Physiological Barriers to Infection — NEET Biology
📚 Practice Concept📖 NCERT Source
Physiological barriers: Acid in the stomach, saliva in the mouth, tears from eyes—all prevent microbial growth.
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QuestionPractice Question
Match List - I with List - II : (NEET 2022 Phase 2) . Choose the correct answer from the options given below :
📖 Solution & NCERT Explanation
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Correct answer: A — (a) - (iii), (b) - (i), (c) - (ii), (d) - (iv)
Option (a) is the correct answer because cellular barriers include NK cells, macrophages (monocytes) and neutrophils (PMNL). Cytokine barriers include interferons. Physical barriers include mucus membranes and skin. Physiological barriers include HCl in gastric juice, saliva and tears etc.
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What does NCERT say about Physiological barriers Acid stomach?
Physiological barriers: Acid in the stomach, saliva in the mouth, tears from eyes—all prevent microbial growth.
Has this concept appeared in NEET?
Practice this NCERT concept with questions on MedicNEET.
Which chapter is this from?
Human Health and Diseases, Class 12 NCERT Biology.
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180of the ReNEET 2026 paper (all subjects) was already in the MedicNEET question bank
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