Question

___(i)_____is the infective stage of Plasmodium to human beings and it multiplies initially within the___(ii)____.

• A. (i)-Sporozoite, (ii)-RBCs
• B. (i)-Gametocyte, (ii)-RBCs
• C. (i)-Sporozoite, (ii)-liver cells
• D. (i)-Gametocyte, (ii)-liver cells

Answer 1

The correct option is C (i)-Sporozoite, (ii)-liver cells

Plasmodium is the malarial parasite that causes malaria fever in human beings. It completes its life cycle in two hosts, human beings and female Anopheles mosquito.

When an infected female Anopheles mosquito (infected with Plasmodium) bites a healthy person to suck the blood, the parasite enters the human body. The infective stage of Plasmodium to man is sporozoite. From blood, the sporozoites migrate to liver cells initially and multiply within the liver cells and increase in number. Later the parasite multiplies within the RBCs and eventually develops into gametocytes The gametocytes are sexual stages. They cannot develop further in human beings.

They are the infective stages to female Anopheles mosquitoes. When a female Anopheles mosquito bites an infected person, the gametocytes reach the mosquito and continue their life cycle further.