Question

Entamoeba histolytica differs from Amoeba in absence of Pseudopodia
A. Pseudopodia
B. Contractile vacuole
C. Nucleus
D. Ectoplasm

Answer 1

Hint: Entamoeba histolytica is a protozoan protist. Entamoeba histolytica is unicellular heterotrophs, free living. They obtain their nutrition by living in other organisms or dead organic materials. Entamoeba histolytica causes a disease like Amoebiasis.

Complete answer:
-Contractile vacuoles: The contractile vacuole is a water bubble within the endoplasm of A Proteus. Its function is to regulate the water content of the cell via diffusion. E histolytica lives in the isotonic solution due to which it doesn't need a contractile vacuole. Since the osmotic concentration of its body remains equal to its surrounding entry of water through osmosis will not happen. Therefore, there is no need for contractile vacuole.
Entamoeba protists lack mitochondria and hydrogenosomes but contain mitosomes. The identification of about 20 putative mitochondrial proteins in the free-living amoeba Mastigamoeba balamuthi suggests that these are more advanced than the microsomes found in Giardia spp.M. balamuthia is a relative of Entamoeba histolytica, the cause of amoeba dysentery. This pathogen is acquired by individuals by eating feces. There they graze on bacteria and produce a suite of digestive enzymes that degrade gut epithelial cells. Cysts in feces remain viable for weeks but are killed by heat greater than 40C.
-Pseudopodia: Locomotion through pseudopodia, cilia, or flagella. They may use cilia, flagella, or pseudopodia. Some protozoans are non-motile. The protozoans that use pseudopodia for their movement are known as amoeboid protozoans.
-Nucleus: Entamoeba histolytica is having a single nucleus and a prominent nucleic border.
Ectoplasm: Entamoeba histolytica ectoplasm has a thin, transparent, and rigid contractile portion of the cytoplasm.
So, the correct answer is “Option B”.

Note:
The Causative agent for Amoebiasis is Entamoeba histolytica which is transmitted by water and food. Entamoeba histolytica is a protozoan parasite in the large intestine of humans which causes amoebiasis. Constipation, abdominal pain, cramps, and stools with excess mucus and blood clots are the symptoms.