Question

This is a life cycle of parasitic protozoans. The correct statements regarding this figure is
1. This is monopodial, monogenetic parasite.
2. The secondary host is snail.
3. The daughter cells formed are eight amoebulae.
4. It has two contractile vacuoles.

• A. All are correct.
• B. 1, 3 and 4 are correct.
• C. 2, 3 and 4 are correct.
• D. 1 and 3 only are correct.

Answer 1

The correct option is D 1 and 3 only are correct.

E. histolytica is a pathogenic intestinal parasite occurring in the colon of man and causes amoebic dysentery or amoebiasis. It has only one host and so monogenetic. Its adult is called as trophozoite and is monopodial. Entamoeba has no contractile vacuole. Trophozoite of Entamoeba reproduces by binary fission. A mature cyst is called as a quadrinucleate cyst. It has four nuclei and two chromatoid bodies. The reserve food material in cyst of E. histolytica is glycogen. Quadri (tetra) nucleate cyst is the infective stage. Infection is oral through contaminated food and water. A single cyst of E.histolytica produces eight amoebulae.

Therefore, the correct answer is option D.