In humans,the life cycle of $Plasmodium$ is observed in how many stages?

In humans,the sporozoite stage of $Plasmodium$ is found in which phase of its life cycle?

Which of the following diseases is considered endemic?

Identify the correct statements from the following:
$(i)$ The cryptozoite ingests food and becomes spherical.
$(ii)$ Sporozoites enter the human blood.
$(iii)$ Two stages of the life cycle are observed in Plasmodium.
$(iv)$ The cryptozoite transforms into cryptomerozoites.

Motile zygote of $Plasmodium$ occurs in

Which toxic substance is responsible for the chills and high fever recurring every three to four days in malaria?