Question

Column- I lists the components of body defense and column-II lists the corresponding descriptions. Match the two columns. Choose the correct option from those given

Column I		Column II
A	Active natural	1	Injection of gamma globulins
B	First line of defense	2	Complement proteins and interferons
C	Passive natural immunity	3	Direct contact with the pathogens that have entered inside
D	Second line of defense	4	Surface barriers
		5	Antibodies transferred through the placenta

• A. A-(4), B-(3), C-(5), D-(2)
• B. A-(3), B-(4), C-(2), D-(5)
• C. A-(3), B-(4), C-(5), D-(2)
• D. A-(5), B-(3), C-(2), D-(1)

Answer 1

Answer: (C)

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).