Answer: Thymus.
- A Spleen
- B Lymph nodes
- C Thymus
- D Tonsils
Correct answer: C. Thymus
Explanation: Bone marrow and the thymus are primary (central) lymphoid organs where immature lymphocytes mature. Spleen, lymph nodes, tonsils and MALT are secondary lymphoid organs.
The Plasmodium parasite needs both hosts: the female Anopheles mosquito injects sporozoites while biting (infecting the human liver and RBCs, causing the malaria fever cycle), then picks up gametocytes from an infected person's blood, completing the parasite's sexual stage inside the mosquito.
Concept context
Pathogens, infectious diseases, non-infectious diseases, drugs, cancer, and public health. High NEET importance.