A) sporozoite
B) trophozoite
C) merozoite
D) schizont
Correct Answer: A
Solution :
The infective stage of Plasmodium is sporozoite. These are small spindle shaped, uninucleate organisms, measuring 11 - 12 \[\mu \]in length and 0.5 - \[\mu \]in width. After penetrating a hepatic cell each sporozoite becomes cryptozoite. Within this structure the mitochondrion also increase during maturation and buds off to produce many small mitochondria. It grows for a number of days and becomes a spherical and non pigmented schizont. Micro meta-cryptomerozoites enter into the blood stream and each enters the red blood corpuscles and assumes rounded disc like shape with single nucleus called trophozoites.
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