The active/trophozoite form of Entamoeba coli feeds upon

Options

A. (a) blood
B. (b) mucosa and submucosa of colon
C. (c) RBC, mucosa and undigested food
D. (d) RBCs, tissue debris and bacteria

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question refers to Entamoeba coli, which is a type of protozoan. It is important to understand its classification as a member of the kingdom Protista.

2. **Understand the Life Cycle**: Entamoeba coli exists in two forms: the cyst form and the trophozoite form. The trophozoite is the active, feeding stage of the organism.

3. **Habitat**: Entamoeba coli primarily resides in the large intestine of humans. This is crucial for understanding its feeding habits.

4. **Feeding Mechanism**: As a protozoan, Entamoeba coli feeds on bacteria and other organic matter present in the intestinal lumen. It does not invade the tissues of the host, which differentiates it from other more harmful species like Entamoeba histolytica.

5. **Nutritional Requirements**: The primary diet of Entamoeba coli consists of bacteria, particularly those that are abundant in the gut, as well as undigested food particles.

6. **Conclusion**: Therefore, the active/trophozoite form of Entamoeba coli feeds upon bacteria and organic matter in the large intestine.

---