Answer: Entamoeba histolytica.
- A Salmonella, a bacterium causing typhoid
- B Entamoeba histolytica
- C Plasmodium, the parasite causing malaria
- D Ascaris, a roundworm causing intestinal infection
Correct answer: B. Entamoeba histolytica
Explanation: Amoebiasis is caused by Entamoeba histolytica, a protozoan. It infects the large intestine, causing diarrhoea with blood and mucus. It spreads through contaminated food and water. Treatment: metronidazole.
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.