Answer: T-lymphocytes.
- A B-lymphocytes
- B T-lymphocytes
- C mast cells
- D erythrocytes
Correct answer: B. T-lymphocytes
Explanation: T-lymphocytes mediate cell-mediated immunity and are responsible for graft rejection, while B-lymphocytes produce antibodies for humoral (antibody-mediated) immunity.
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.