Q.96 Match the immunological statements in Column I with the appropriate descriptions from Column II
| Column I | Column II |
|---|---|
| P. Active acquired immunity | (i) Complement proteins and interferons |
| Q. First line of defense | (ii) Direct contact with pathogens that enter body |
| R. Passive natural immunity | (iii) Surface barriers |
| S. Second line of defense | (iv) Antibodies pass through placenta |
Active acquired immunity involves the body’s own production of antibodies following exposure to a pathogen, while the correct matching for this immunology question pairs Column I terms with their precise descriptions in Column II. The right answer is option (B), as it accurately aligns each concept based on standard immunological definitions.
Question Breakdown
This matching question tests knowledge of innate and acquired immunity components, crucial for exams like CSIR NET Life Sciences. Column I lists defense mechanisms, and Column II provides descriptions. Correct matches are:
| Column I | Correct Match (Column II) | Explanation |
|---|---|---|
| P. Active acquired immunity | (iv) Antibodies pass through placenta | No—this is passive immunity. Active acquired immunity occurs when the body produces its own antibodies after natural infection or vaccination, creating long-term memory . |
| Q. First line of defense | (ii) Surface barriers | Yes—physical barriers like skin and mucous membranes block pathogen entry without specific recognition . |
| R. Passive natural immunity | (iv) Antibodies pass through placenta | Yes—maternal IgG antibodies transfer naturally to the fetus, providing short-term protection without the infant’s immune response . |
| S. Second line of defense | (i) Complement proteins and interferons | Yes—these innate components activate after breach of first-line barriers, with complement aiding lysis and opsonization, and interferons signaling antiviral states . |
Option Analysis
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(A) P-(ii); Q-(iii); R-(iv); S-(i): Wrong. Mismatches active immunity to barriers and first line to “direct contact with pathogens,” which fits second line phagocytes.
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(B) P-(iv); Q-(ii); R-(iv); S-(i): Correct. P aligns with natural passive via placental transfer; Q with barriers; R repeats (iv) logically for passive natural; S with innate proteins.
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(C) P-(iv); Q-(ii); R-(iii); S-(i): Wrong. Passive natural immunity isn’t “direct contact with pathogens” (that’s phagocytes in second line).
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(D) P-(i); Q-(iv); R-(iii); S-(ii): Wrong. Active immunity isn’t complement/interferons, and first line isn’t placental antibodies.
The human immune system features layered defenses, starting with match immunological statements Column I Column II concepts like active acquired immunity and first line of defense. These terms are key for competitive exams such as CSIR NET Life Sciences, where understanding innate versus acquired immunity determines success.
Core Immunity Types
Active acquired immunity develops when exposure to pathogens triggers antibody production, lasting lifelong via memory cells. Passive natural immunity, however, transfers ready-made maternal antibodies across the placenta, offering newborns temporary protection.
Lines of Defense Explained
The first line of defense relies on surface barriers like skin to prevent entry. Once breached, the second line activates complement proteins for pathogen lysis and interferons for antiviral alerts.
This match immunological statements Column I Column II exercise reinforces these distinctions, with option (B) as the precise pairing for exam preparation.
