Phagocytic Cells in Immune Defense — NEET Biology
📚 Practice ConceptMonocytes and natural killer (type of lymphocytes) in the blood as well as macrophages in tissues can phagocytose and destroy microbes.
Match the following components of immunity with their correct roles: Column I A. Physical barriers B. Physiological barriers C. Cellular barriers D. Cytokine barriers E. B-lymphocytes Column II 1. Acid in stomach, saliva in mouth, tears in eyes 2. Produce antibodies in blood during acquired immunity 3. Polymorpho-nuclear leukocytes, monocytes, macrophages, natural killer cells 4. Prevent microbial entry via skin and mucous lining of tracts 5. Virus-infected cells secrete interferons to protect neighbouring cells
View solution & NCERT explanation
Correct answer: C — A–4, B–1, C–3, D–5, E–2
A–4: Skin and mucous membranes act as physical barriers. B–1: Stomach acid, saliva, and tears prevent microbial growth. C–3: Neutrophils, monocytes, macrophages, NK cells form cellular barriers. D–5: Interferons secreted by infected cells protect uninfected cells. E–2: B-lymphocytes produce antibodies during humoral immune response.
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