Answer: passive immunity.
- A active immunity
- B passive immunity
- C innate immunity
- D autoimmunity
Correct answer: B. passive immunity
Explanation: When ready-made antibodies are given directly, the protection is immediate but short-lived; this is passive immunity. Active immunity develops when the body itself makes antibodies after exposure to an antigen.
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.