Question

In Entamoeba histolytica, the presence of chromatid bodies is characteristic of
A)Precystic stage
B)Trophozoite stage
C)Mature binucleate stage
D)Both A and B

Answer 1

Hint: The pathogenic parasite which inhabits the intestine of human beings and many other primates is Entamoeba histolytica. It is a Cosmopolitan in distribution and mainly common in tropical and subtropical countries. The life cycle of entamoeba histolytica is completed in a single host i.e man.

Complete answer:
Three different types of morphological forms exist in the life cycle of Entamoeba histolytica. They are - Trophozoite, pre cystic stage, and cystic stage.
Pre cystic stage- during this stage the entamoeba histolytica reduces in size and usually bears single blunt pseudocode.is shows the presence of chromatid bodies in the pre cystic stage and they usually disappear as the cyst matures. This stage forms encyst only in the lumen of the intestine.
-the chromatin bodies are made up of crystalline Ribosomes and are generally cigar-shaped bodies.

Additional Information: Trophozoite stage - it is a feeding stage of the parasite during this stage the parasite lives in the mucosa and submucosa layer of the large intestine of man. These are usually unicellular and during the optimal conditions, they exhibit slow gliding movement by forming pseudopodia. Therefore the body shape is not fixed.
-The cytoplasm divides into clear ectoplasm and a granular endoplasm of trophozoites.
 endoplasm. The endoplasm is composed of a single spherical nucleus, red blood cells, and tissue debris.
-It secretes a proteolytic ferment and brings destruction and necrosis of the surrounding host tissue. They are usually parasitic in nature, growing in the living tissue and multiplied there to maintain their presence in good numbers.
Mature binucleate stage - this is also known as cystic stage, this parasite moves into the gut lumen and transforms into cystic form a process is known as encystation.
-in the beginning, a cyst is an uninucleated body but later it divides by binary fission and becomes a binucleate form. So, by mitotic division a single nucleus forms for daughter nuclei.

So, the correct answer is, "Pre cystic stage".

Note: -When the cyst matures, it passes out of the host body through feces and is able to survive for 10 days and eventually dies when the thermal point reaches up to 50 degrees Celsius.
-The entamoeba histolytica belongs to the phylum Protozoa in the class Rhizopoda.