'Signet ring' stage of Plasmodium is found in

RBC of man

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RBC of Anopheles

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Liver of man

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Salivary glands of Anopheles

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Solution

The correct option is A RBC of man
Signet ring stage is the stage between the R.B.C and trophozoite. Merozoite larva develops into a trophozoite, which grows by feeding on haemoglobin of RBC. A new vacuole forms in the centre of the cytoplasm, which pushes the nucleus to one side giving the parasite a ring-like appearance. Such a trophozoite is said to be in signet ring stage. Thus the correct answer is option A.

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