| Column- I | Column- II |
| A. Active natural B. First line of defense C. Passive natural immunity D. Second line of defense | 1. Injection of gamma globulins 2. Complement proteins and interferons 3. Direct contact with the pathogens that have entered inside 4. Surface barriers 5. Antibodies transferred through the placenta |
A) A B C D 4 3 5 2
B) 3 4 2 5
C) 3 4 5 2
D) 5 3 2 1
Correct Answer: C
Solution :
Active natural immunity (Innate immunity) is possessed naturally by an individual. Such immunity results either from a sub-clinical or chemical infection, ie, direct contact with the pathogens that have entered inside. First line of defence consists of physical barriers of skin, membranes, friendly micro organisms and chemical barriers. In passive natural immunity antibodies passively pass from mother to foetus via placenta. A pathogen having entered body tissue fluid is confronted with second line of defence consisting of phagocytosis and inflammatory response like interferons (anti-viral) properdin (anti-RBCs).
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