Question

Match the following:

• A. A-II, B-IV, C-I, D-V
• B. A-II, B-IV, C-III, D-V
• C. A-V, B-I, C-IV, D-II
• D. A-III, B-II, C-IV, D-I

Hint:

Lymphoid organs are classified into primary (where immune cells develop) and secondary (where immune responses occur). Kupffer cells are liver macrophages that help clear pathogens from the blood.

Answer 1

The Correct Option is A

Step 1: Understanding the Terms

Each item in List-1 represents a specific type of biological structure, while List-2 provides corresponding components.
Step 2: Matching the Terms Correctly

- Primary lymphoid organ refers to organs responsible for the production and maturation of immune cells. The Bursa of Fabricius (II) is a primary lymphoid organ in birds.
- Secondary lymphoid organ includes sites where immune responses occur. Tonsils (IV) are secondary lymphoid organs.
- Mononuclear phagocytes include cells that engulf pathogens. Kupffer cells (I) are liver macrophages and belong to this category.
- Auxiliary cells support immune responses, and Mast cells (V) play a role in allergic reactions.

Step 3: Conclusion

Thus, the correct matching is:
- A → II
- B → IV
- C → I
- D → V