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NDA 1 2025 GAT, question 111

Topic: Biology

Q111

Clotting of blood involves which one among the following clotting proteins ?

  1. (a) Pathogen
  2. (b) FibrinogenCorrect answer
  3. (c) Macrophage
  4. (d) Phagocytes

Solution.

Answer: (b) Fibrinogen

  1. During clotting, thrombin converts soluble fibrinogen into insoluble fibrin.
  2. Fibrin forms a mesh that traps blood cells and helps seal the damaged vessel.
  3. Macrophages and other phagocytes are cells, while a pathogen is a disease-causing agent.