Black water fever is caused by

Periodic appearance of malaria symptoms occurs due to periodic

Assertion: There is no chance of malaria to a man on the bite of male $Anopheles$ mosquito.
Reason: It carries a non-virulent strain of $Plasmodium$.

Which of the following toxic substances is responsible for the chill and high fever recurring every three to four days in malaria?

Entamoeba histolytica is a human parasite usually found in

In $Plasmodium$,the motile zygote formed after fertilization is called .........