Question

The protozoan responsible for amoebic dysentery is-

• A. Entamoeba
• B. Amoeba
• C. Photographic
• D. Trypanosoma

Hint:

Think of the parasite whose full scientific name is Entamoeba histolytica, which infects the large intestine.

Answer 1

The Correct Option is A

Step 1: Recall what causes amoebic dysentery.
Amoebic dysentery is a bowel infection caused by a single celled parasite. The parasite invades the lining of the large intestine and causes loose stools mixed with blood and mucus.

Step 2: Name the exact organism.
The organism responsible is Entamoeba histolytica, a protozoan parasite that lives in the human gut. It spreads through water or food contaminated with cysts from infected stool. Once inside the body, it can damage the intestinal wall and, in bad cases, travel to the liver and form an abscess.

Step 3: Check why the other options are wrong.
Amoeba (option B) is a broad name for free living, non-parasitic organisms such as Amoeba proteus, found commonly in ponds. It does not infect humans or cause disease, so it is not the right answer even though it sounds similar to Entamoeba. Option C, "Photographic," is not a biological term at all and does not fit the question in any way. Trypanosoma (option D) is a different protozoan parasite that causes diseases like sleeping sickness and Chagas disease, spread by insect bites, not dysentery.

Step 4: Final Answer.
The organism that causes amoebic dysentery is Entamoeba (Entamoeba histolytica). \[ \boxed{\text{Entamoeba}} \]